Статті в журналах: "Strange D meson"

1

Du, Meng-Lin. "Implication of chiral symmetry on charm meson spectroscopy." EPJ Web of Conferences 202 (2019): 06003. http://dx.doi.org/10.1051/epjconf/201920206003.

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It is demonstrated that, if the lightest positive parity charm mesons are assumed to owe their existence to non-perturbative Goldstone boson-D/D∗ scattering, various puzzles in the charm meson spectrum get resolved. Most importantly the ordering of the lightest strange and non-strange scalars becomes natural. Furthermore, it is demonstrated that the amplitudes for Goldstone boson-D/D∗ scattering are fully consistent with the high quality data on decay B−→ D+π−π− provided by LHCb. It implies that the lowest positive-parity charm mesons are dynamically generated rather than quark-antiquark states.

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2

Debernardis, Francesco. "Spectroscopy of the excited D_s mesons." EPJ Web of Conferences 270 (2022): 00013. http://dx.doi.org/10.1051/epjconf/202227000013.

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The discoveries of the Ds0*(2317)+ and Ds1(2460)+ mesons challenge our understanding of quantum chromodynamics. After almost 20 years, the nature of these hadrons is still subject of debate and many models have been proposed to explain their unexpected masses: standard charmed-strange mesons, DK molecules and tetraquarks. The LHCb experiment has studied the production of excited Ds+ meson in prompt proton-proton collisions and from b-hadron decays. Precise measurement of their properties and observation of new Ds+ states have been reported. The latest results on the spectroscopy of the charmed-strange mesons and the prospect to investigate their nature will be presented.

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3

Grosa, Fabrizio. "Measurement of the D-meson nuclear modification factor and elliptic flow in Pb–Pb collisions at √SNN = 5.02 TeV with ALICE at the LHC." EPJ Web of Conferences 171 (2018): 18007. http://dx.doi.org/10.1051/epjconf/201817118007.

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Heavy-flavour hadrons are recognised as a powerful probe for the characterisation of the deconfined medium created in heavy-ion collisions, the Quark-Gluon Plasma (QGP). The ALICE Collaboration measured the production of D0, D+, D*+ and [see formula in PDF] mesons in Pb–Pb collisions at [see formula in PDF] = 5.02 TeV. The measurement of the nuclear modification factor (RAA) provides a strong evidence of the in-medium parton energy loss. The comparison between the [see formula in PDF] and the non-strange D-meson RAA can help to study the hadronisation mechanism of the charm quark in the QGP. In mid-central collisions, the measurement of the D-meson elliptic flow v2 at low transverse momentum (pT) gives insight into the participation of the charm quark into the collective motion of the system, while at high pT it constrains the path-length dependence of the energy loss. The [see formula in PDF] v2, measured for the first time at the LHC, is found to be compatible to that of non-strange D mesons and positive with a significance of about 2.6 σ. The coupling of the charm quark to the light quarks in the underlying medium is further investigated for the first time with the application of the Event-Shape Engineering (ESE) technique to D-meson elliptic flow.

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4

BENUSSI, LUIGI. "MEASUREMENTS OF MASSES AND WIDTHS OF EXCITED CHARM MESONS $D_2^*$, EVIDENCE FOR BROAD STATES AND OBSERVATION OF $D_S^+(2317)$ FROM FOCUS EXPERIMENT." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 549–53. http://dx.doi.org/10.1142/s0217751x05021750.

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I report three new results from photoproduction experiment FOCUS on L=1 excited meson spectroscopy: precise measurements of the masses and widths of the [Formula: see text] and [Formula: see text] mesons, evidence for broad states decaying to D+π-, D0π+ (the first such evidence in D0π+), and confirmation of the recently observed [Formula: see text] charmed-strange state.

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5

SEGOVIA, J., D. R. ENTEM, F. FERNANDEZ, and E. HERNANDEZ. "CONSTITUENT QUARK MODEL DESCRIPTION OF CHARMONIUM PHENOMENOLOGY." International Journal of Modern Physics E 22, no. 10 (October 2013): 1330026. http://dx.doi.org/10.1142/s0218301313300269.

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We review how quark models are able to describe the phenomenology of the charm meson sector. The spectroscopy and decays of charmonium and open charm mesons are described in a particular quark model and compared with the data and the results of other existing models in the literature. A quite reasonable global description of the heavy meson spectra is reached. A new assignment of the ψ(4415) resonance as a 3D state leaving aside the 4S state to the X(4360) is tested through the analysis of the resonance structure in e+e- exclusive reactions around the ψ(4415) energy region. We make tentative assignments of some of the XYZ mesons. To elucidate the structure of the 1+cs states, i.e., Ds1(2460) and Ds1(2536), we study the strong decay properties of the Ds1(2536) meson. We also perform a calculation of the branching fractions for the semileptonic decays of B and Bs mesons into final states containing orbitally excited charmed and charmed-strange mesons, which have become a very important source of information about the structure of heavy mesons. Analysis of the nonleptonic B-meson decays into D(*)DsJ are also included.

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6

Jaelani, Syaefudin. "Measurement of the D-meson Nuclear Modification Factor and Elliptic Flow in Pb–Pb Collisions at sNN = 5.02 TeV with ALICE at the LHC." International Journal of Modern Physics: Conference Series 46 (January 2018): 1860018. http://dx.doi.org/10.1142/s2010194518600182.

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Heavy-flavour hadrons are effective probes to study the Quark-Gluon Plasma (QGP) formed in ultra-relativistic heavy-ion collisions. The ALICE Collaboration measured the D-mesons (D0, D[Formula: see text], D*[Formula: see text] and D[Formula: see text]) production in Pb–Pb collisions at [Formula: see text] = 5.02 TeV. The in-medium energy loss can be studied by means of the nuclear modification factor ([Formula: see text]). The comparison between the D[Formula: see text] and the non-strange D-meson [Formula: see text] can help to study the hadronisation mechanism of the charm quark in the QGP. In semi-central collisions the measurement of the D-meson elliptic flow, [Formula: see text], at low [Formula: see text] allows to investigate the participation of the heavy quarks in the collective expansion of the system while at high [Formula: see text] it constrains the path-length dependence of the energy loss. Furthermore the Event-Shape Engineering (ESE) technique is used to measure D-meson elliptic flow in order to study the coupling of the charm quarks to the light quarks of the underlying medium.

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7

Ma, Li. "Double heavy tri-hadron bound state with strange flavor." EPJ Web of Conferences 202 (2019): 06007. http://dx.doi.org/10.1051/epjconf/201920206007.

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Through the Born-Oppenheimer Approximation, we have performed a comprehensive investigation of the DD∗K, D$ \overline D $*K, BB∗$ \overline K $ and B$ \overline B $*$ \overline K $ molecular states. In the framework of One-Pion Exchange model as well as the treatments of the coupled-channel eﬀects and S-D wave mixing, we find a loosely bound tri-meson molecular state these systems with the isospin configuration |0,$ {1 \over 2} $, ±$ {1 \over 2} $> and quantum number I(JP) = 1/2(1−), where the, $ {1 \over 2} $ is the total isospin of the three-body system, the 0 is the isospin of the D∗K, $ \overline D $*K, B∗$ \overline K $ and $ \overline B $∗$ \overline K $. With the estimated error, the mass of the DD∗K or D$ \overline D $∗K molecule is $ 4317.92_{ - 4.32}^{ + 3.66} $ MeV or $ 4317.92_{ - 6.55}^{ + 6.13} $MeV. We also extend our calculations to the bottom sector and find tri-meson bound states for the BB∗$ \overline K $ and B$ \overline B $*$ \overline K $ with the mass $ 11013.65_{ - 8.84}^{ + 8.49} $ MeV and $ 11013.65_{ - 9.02}^{ + 8.68} $MeV respectively.

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8

Russ, James S. "First Observation of the DsJ(2632) Meson." International Journal of Modern Physics A 20, no. 16 (June 30, 2005): 3675–76. http://dx.doi.org/10.1142/s0217751x05027278.

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The SELEX Collaboration has announced the first observation of a massive, narrow resonance in the charm-strange system. Seen both in D S η and D 0 K + final states, the meson is unusual both in that it is very narrow despite being far above the strong decay threshold and also in that the [Formula: see text]. Production is also unusual, with a large asymmetry favoring [Formula: see text] over [Formula: see text] production from the Σ- beam.

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9

Ortega, P. G., J. Segovia, D. R. Entem, and F. Fernández. "Threshold effects in hadron spectrum: a new spectroscopy?" EPJ Web of Conferences 182 (2018): 02094. http://dx.doi.org/10.1051/epjconf/201818202094.

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The exploration of energies above the open-flavor threshold in the meson spectra has led to the appearance of unexpected states difficult to accommodate in the naive picture of a bound state of a quark and an antiquark. Many of such states are located close to meson-meson thresholds, which suggests that molecular structures may be a relevant component in the total wave function of such resonances. In this work, the state of meson-meson molecules calculations is reviewed, using a nonrelativistic constituent quark model that has been applied to a wide range of hadronic observables, and therefore all model parameters are completely constrained. The model has been able to reproduce, among others, the properties of the X(3872), described as a mixture of cc and DD* states, or the spectrum of the P-wave charm-strange mesons, which are well reproduced only if DK and D*K structures are taken into account. We show that such constituent quark model, which is able to describe the ordinary heavy meson spectra, is also capable of providing a good description of many new states recently reported.

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10

Acharya, Shreyasi. "Heavy-flavour production in small systems and evolution with multiplicity with ALICE." EPJ Web of Conferences 259 (2022): 12012. http://dx.doi.org/10.1051/epjconf/202225912012.

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In this report, highlights on the multiplicity-dependent measurements of heavy-flavour hadrons performed by the ALICE experiment, are presented. The heavy-flavour baryon-to-meson Λc0/D0 and strange-to-non-strange D meson DS+/D0 ratios in different charged-particle multiplicity intervals are discussed. Recent measurements of heavy-flavour self-normalised yields as a function of the self-normalised charged-particle multiplicity in pp collisions at √S = 13 TeV are also reported. Measurement of jets containing heavy-flavour hadrons in pp and p–Pb collisions at √SNN = 5.02 TeV and the recent measurements of azimuthal correlations of heavy-flavour hadron decay electrons and charged hadrons in pp collisions at √S = 5.02 TeV are presented.

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11

Guo, Feng-Kun. "Status of charmed meson spectroscopy." EPJ Web of Conferences 202 (2019): 02001. http://dx.doi.org/10.1051/epjconf/201920202001.

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The discovery of the ground state positive-parity charm-strange and charm-nonstrange mesons $ D_{s0}^* $(2317), Ds1(2460), $ D_0^* $(2400) and D1(2430) in 2003 and 2004 brought up several mysteries related to their masses. Here I briefly review recent progresses from lattice calculations and analysis of the precise LHCb measurements of the B−→ D+π−π− in the framework of unitarized chiral perturbation theory. It turns out that all the mysteries can be understood in a picture consistent with both lattice results and the LHCb measurements. In this picture, the main components of $ D_{s0}^* $(2317) and Ds1(2460) are DK and D∗K hadronic molecules, respectively. Furthermore, the resonance parameters of the ground state 0+ and 1+ charm-nonstrange mesons take values very diﬀerent from the known ones of the $ D_0^* $(2400) and D1(2430), which were obtained by using an improper resonance parameterization. It is pointed out that there should be two $ D_0^* $ and two D1 broad states in region relevant to the $ D_0^* $ (2400) and D1(2430). Suggestions towards identifying the higher nonstrange resonances are given.

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12

SOYEUR, MADELEINE, and MATTHIAS F. M. LUTZ. "DYNAMICS OF STRONG AND RADIATIVE DECAYS OF Ds MESONS." International Journal of Modern Physics A 24, no. 02n03 (January 30, 2009): 417–21. http://dx.doi.org/10.1142/s0217751x09043754.

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The positive parity scalar [Formula: see text] and axial-vector [Formula: see text] charmed strange mesons are generated by coupled-channel dynamics through the s-wave scattering of Goldstone bosons off the pseudoscalar and vector D ( D s)-meson ground states. The attraction leading to the specific masses of these states reflects the chiral symmetry breaking scale which characterizes the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections to order [Formula: see text] are calculated and found to be small. The [Formula: see text] and [Formula: see text] mesons decay either strongly into the isospin-violating π0 D s and [Formula: see text] channels or electromagnetically. We show that the π0-η and ( K 0 D +- K + D 0) mixings act constructively to generate strong widths of the order of 140 keV. The one-loop contribution to the radiative decay amplitudes of scalar and axial-vector states is calculated using the electromagnetic Lagrangian to chiral order [Formula: see text]. We show the importance of taking into account processes involving light vector mesons explicitly in the dynamics of electromagnetic decays to obtain a satisfactory description of the available data.

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13

Ishikawa, Takatsugu, Hisako Fujimura, Hiroshi Fukasawa, Ryo Hashimoto, Qinghua He, Yuki Honda, Takahiro Iwata, et al. "Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron." EPJ Web of Conferences 241 (2020): 01007. http://dx.doi.org/10.1051/epjconf/202024101007.

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The B = 2 bound/resonance state (dibaryon) is an interesting object, which can be a molecule consisting of two baryons or a spatially compact hexaquark hadron object. The yd ^ n°n°d reaction has been experimentally investigated at incident energies ranging from 0.58 to 1.15 GeV to study non-strange dibaryons. The angular distributions of deuteron emission in the yd center-of-mass energy cannot be reproduced by quasi-free production of two neutral pions followed by deuteron coalescence. Additionally a 2.14-GeV peak is observed in the n°d invariant mass distribution. These suggest a sequential process such as yd ^ RIS ^ n°RIV ^ n°n°d with an isoscalar dibaryon RIS and an isovector dibaryon RIV. Since the mass of the observed isoscalar dibaryons are close to the sum of the nucleon (N) and nucleon resonance (N*) masses, an S-wave NN* molecule may play a role as a doorway to a dibaryon.

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14

SOYEUR, MADELEINE, and MATTHIAS F. M. LUTZ. "RADIATIVE AND STRONG DECAYS OF Ds-MESONS IN THE HADROGENESIS CONJECTURE." Modern Physics Letters A 23, no. 27n30 (September 30, 2008): 2242–45. http://dx.doi.org/10.1142/s0217732308029113.

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The recently discovered scalar [Formula: see text] and axial vector [Formula: see text] charmed strange mesons are predicted in the hadrogenesis picture. They are generated by coupled-channel dynamics involving the scattering of Nambu-Goldstone bosons off pseudoscalar and vector D(Ds)-meson ground-states. The interaction vertices are given by the leading order chiral Lagrangian and chiral corrections to order [Formula: see text]. To assess this dynamical picture further, the radiative and strong decays into the isospin-violating π0Ds and [Formula: see text] channels are calculated. A consistent picture of these decays emerges when the parameters are chosen in accordance with expectations from the heavy-quark symmetry and large N c limit of QCD and when light vector mesons are introduced explicitly in the radiative decay processes. More accurate data are needed to predict decay parameters reliably.

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15

NAM, SEUNG-IL. "HEAVY PSEUDOSCALAR-MESON DECAY CONSTANTS WITH STRANGENESS FROM THE EXTENDED NONLOCAL CHIRAL-QUARK MODEL." Modern Physics Letters A 27, no. 27 (August 23, 2012): 1250153. http://dx.doi.org/10.1142/s0217732312501532.

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We study the weak-decay constants for the heavy pseudoscalar mesons, D, Ds, B and Bs. For this purpose, we employ the extended nonlocal chiral-quark model (ExNLChQM), motivated by the heavy-quark effective field theory as well as the instanton-vacuum configuration. In addition to the heavy-quark symmetry and the nonlocal interactions between quarks and pseudoscalar mesons in ExNLChQM, a correction for the strange-quark content inside Ds and Bs is also taken into account and found to be crucial to reproduce the empirical values. From those numerical results, we obtain fD, Ds, B, Bs = (207.53, 262.56, 208.13, 262.39) MeV , which are in good agreement with experimental data and other theoretical estimations. Using those numerical results, we estimate the CKM matrix elements and the Cabibbo angle with the various mesonic and leptonic heavy-meson decay channels, resulting in (|Vcd|, |Vcs|, |Vub|, |Vtd|/|Vts|) = (0.224, 0.968, <5.395×10-3, 0.215) and θC = 12.36° which are well compatible with available data.

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16

Bediaga, Ignacio. "Indication of a low-mass scalar strange meson in D+ → K−π+π+ decay". Nuclear Physics B - Proceedings Supplements 121 (червень 2003): 104–9. http://dx.doi.org/10.1016/s0920-5632(03)01822-x.

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17

Peng, Xinye. "Non-strange and strange D-meson and charm-baryon production in heavy-ion collisions measured with ALICE at the LHC." Nuclear Physics A 982 (February 2019): 667–70. http://dx.doi.org/10.1016/j.nuclphysa.2018.09.017.

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18

MUNHOZ, M. G., and J. TAKAHASHI. "MEASUREMENTS OF MULTI-STRANGE (ANTI-)BARYON PRODUCTION IN Cu+Cu COLLISIONS WITH THE STAR EXPERIMENT AT RHIC." International Journal of Modern Physics E 16, no. 07n08 (August 2007): 2091–96. http://dx.doi.org/10.1142/s0218301307007519.

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Strange particle production has always been an important probe to study various aspects of the high density, strong interacting matter created in ultra-relativistic heavy-ion collisions. Yields and spectra of strange hadrons have been measured by the STAR experiment for center of mass energies of 62.4 GeV, 130 GeV and 200 GeV per nucleon pair for Au + Au , p + p and d + Au collisions. We have now measured Cu + Cu collisions at 62.4 GeV and 200 GeV, complementing the study of the system size dependence initiated with the centrality dependence study of Au + Au data. We will present preliminary results on Ξ, Ω and their anti-particles produced in Cu + Cu collisions. Yields and ratios are compared to results from Au + Au collisions normalized by the equivalent number of participants. The nuclear modification factor of the measured particles from Cu + Cu data also shows the same suppression effects in the high transverse momentum region and a baryon/meson difference in the intermediate momentum region.

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19

NEMURA, H., N. ISHII, S. AOKI, and T. HATSUDA. "LATTICE QCD SIMULATION OF HYPERON-NUCLEON POTENTIAL." Modern Physics Letters A 23, no. 27n30 (September 30, 2008): 2285–88. http://dx.doi.org/10.1142/s0217732308029204.

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We calculate pΞ0 potentials from the equal-time Bethe-Salpeter amplitude measured in the quenched QCD simulation with the spatial lattice volume, (4.4 fm)3. The standard Wilson gauge action with the gauge coupling β = 5.7 on 324 lattice together with the standard Wilson quark action is used. The hopping parameter κud = 0.1678 is chosen for u and d quarks, which corresponds to mπ ≃ 0.37 GeV . The physical strange quark mass is used by taking the parameter κs = 0.1643 which is deduced from the physical K meson mass. The lattice spacing a = 0.1420 fm is determined by the physical ρ meson mass. We find that the pΞ0 potential has sizable spin dependence. Strong repulsive core is found in 1S0 channel while the effective central potential in the 3S1 channel has relatively weak repulsive core. The potentials also have weak attractive parts in the medium to long distance region (0.6 fm ≲ r ≲ 1.2 fm ) in both of the 1S0 and 3S1 channels.

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20

Bugaev, K. A., E. G. Nikonov, A. S. Sorin, and G. M. Zinovjev. "On Asymptotic Regge Trajectories of Heavy Meson Resonances." Ukrainian Journal of Physics 56, no. 7 (February 9, 2022): 611. http://dx.doi.org/10.15407/ujpe56.7.611.

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We performed the analysis of the asymptotic behavior of Regge trajectories of nonstrange and strange mesons and found that thewidth of heavy hadrons for these trajectories cannot linearly depend on their mass. Such a finding clearly demonstrates that a widely spread belief on the linear mass dependence of the resonance width contradicts the linearity of Regge trajectories on theMandelstam variable s. Using the data on masses and widths for ρJ––, ωJ––, aJ++,, and fJ++ mesons with the spin values J ≤ 6 and for K*J mesons with J ≤ 5, we extracted the parameters of the asymptotically linear Regge trajectories predicted by the finite-width model of quark gluon bags. It is shown that the parameters obtained for the data sets B and D are consistent with the cross-over temperaturedetermined by the lattice QCD simulations at the vanishing baryonic density and with the kinetic freeze-out temperature of early hadronizing particles found in relativistic heavy ion collisions at and above the highest SPS energy. Comparing the resonance width of sets B and D evaluated at the masses of Z and W bosons, respectively, we discovered that the calculated width values match that of the gauge bosons. We argue that such matches provide us with indirect, but the first experimental evidence for the compositeness of Z and W bosons. Based on these findings, we assume that Z, W, and Higgs bosons have the Regge trajectories which are similar to the asymptotic trajectories of the studied mesons. The predictions for the masses and widths of the Regge partners of Z and W bosons and for the mass dependence of the widths of Higgs boson Regge partners along with the values for the mass and width of the scalar Higgs mesons are made as well.

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21

YANG, C. B. "PARTICLE PRODUCTION AT RHIC FROM QUARK RECOMBINATION." International Journal of Modern Physics E 16, no. 10 (November 2007): 3148–59. http://dx.doi.org/10.1142/s0218301307009142.

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Particle production at RHIC is discussed within the framework of quark recombination model. After a short introduction on the anomalies discovered at RHIC, we will first present the basic physics ideas common for all the quark recombination models and different implementations in different research groups. Then the main focus turns to the approach of Oregon group. Feynman and Field's independent fragmentation process is re-interpreted in the quark recombination model. In this approach, hard partons with high virtuality evolves into a shower of semihard partons by radiating gluons which can convert into quark-antiquark pairs. Then different fragmentation functions can be rewritten in terms of only a few shower parton distributions within the recombination model. By fitting the data on the fragmentation functions, the shower parton distributions can be determined and then can be used in other processes together with the assumed exponential distributed soft parton distributions. Applications to the particle production at RHIC for both Au + Au and d + Au collisions in mid-rapidity are discussed. In particular, the suppression for meson production in central Au + Au collisions and Cronin effect in d + Au collisions are naturally explained within the recombination models. Finally, strange particle production is briefly discussed.

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22

LIU, XIANG. "THE THEORETICAL REVIEW OF EXCITED D/Ds MESONS." International Journal of Modern Physics: Conference Series 02 (January 2011): 147–52. http://dx.doi.org/10.1142/s2010194511000717.

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More and more new charmed-strange and charmed states have been observed by experiment in the past several years. In this talk, we give a brief review of the theoretical progress of excited D/Ds mesons.

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23

Chhabra, Rahul, and Arvind Kumar. "D*andB*mesons in strange hadronic medium at finite temperature." EPJ Web of Conferences 112 (2016): 04001. http://dx.doi.org/10.1051/epjconf/201611204001.

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24

GODFREY, STEPHEN. "P-WAVE CHARM MESONS AS A WINDOW TO THE DsJ STATES." International Journal of Modern Physics A 20, no. 16 (June 30, 2005): 3771–73. http://dx.doi.org/10.1142/s0217751x05027576.

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Анотація:

In my talk I discussed the properties of the newly discovered [Formula: see text], DsJ(2460), X(3872), and SELEX [Formula: see text] states and suggested experimental measurements that can shed light on them. In this writeup I concentrate on an important facet of under-standing the DsJ states, the properties of the closely related [Formula: see text] and D′1 states. These states are well described as the broad, j = 1/2 non-strange charmed P-wave mesons.

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25

Karliner, Marek, Jonathan L. Rosner, and Tomasz Skwarnicki. "Multiquark States." Annual Review of Nuclear and Particle Science 68, no. 1 (October 19, 2018): 17–44. http://dx.doi.org/10.1146/annurev-nucl-101917-020902.

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Анотація:

Why do we see certain types of strongly interacting elementary particles and not others? This question was posed more than 50 years ago in the context of the quark model. M. Gell-Mann and G. Zweig proposed that the known mesons were [Formula: see text] and baryons qqq, with the quarks known at the time, u (up), d (down), and s (strange), having charges of 2/3, −1/3, and −1/3, respectively. Mesons and baryons would then have integral charges. Mesons such as [Formula: see text] and baryons such as [Formula: see text] would also have integral charges. Why weren't they seen? They have now been seen, but only with additional heavy quarks and under conditions that tell us a lot about the strong interactions and how they manifest themselves. This review describes recent progress in our understanding of such exotic mesons and baryons.

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26

Segovia, J., C. Albertus, E. Hernández, F. Fernández, and D. R. Entem. "The nature of the orbitally excited charmed-strange mesons through nonleptonicB→D(*)DsJ(*)decays." EPJ Web of Conferences 37 (2012): 05003. http://dx.doi.org/10.1051/epjconf/20123705003.

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27

Segovia, J., D. R. Entem, and F. Fernandez. "D s 1 (2536) + decays and the structure of P -wave charmed strange mesons." Chinese Physics C 34, no. 9 (September 2010): 1408–10. http://dx.doi.org/10.1088/1674-1137/34/9/056.

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28

NOWAK, MACIEJ A. "STATUS OF CHIRAL DOUBLERS OF HEAVY-LIGHT HADRONS IN LIGHT OF RECENT BABAR, CLEO, BELLE AND SELEX Ds STATES." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 229–39. http://dx.doi.org/10.1142/s0217751x05021397.

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We explain the main idea of the chiral doublers scenario, originating from simultaneous constraints of chiral symmetry and of heavy quark spin symmetry on effective theories of heavy-light hadrons. In particular we discuss chiral doublers for mesons, chiral doublers for excited mesons, chiral doublers for baryons and chiral doublers for excited baryons. We point out the arguments why new states Ds(2317) and Ds(2457) might be viewed as chiral doublers of Ds and [Formula: see text]. Then we comment on non-strange mesons D0(2308) and D′1(2427) observed by Belle and Focus, and on Θc(3099) signal observed by H1. Finally, we point out that very recent discovery by SELEX of Ds(2632), if confirmed by other experiments and if spin-parity of this state is 1-, may be interpreted as a signal for chiral doubler of Ds1(2536). Such an identification implies another narrow, spin-parity 2-Ds state ca 37 MeV above the new 1-, corresponding to chiral partner of Ds2.

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29

Pütz, Jennifer, Albrecht Gillitzer, James Ritman та Tobias Stockmanns. "Study of pp → 𝚵+ ΛK- with the PANDA Detector". EPJ Web of Conferences 241 (2020): 03004. http://dx.doi.org/10.1051/epjconf/202024103004.

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Анотація:

For a deeper insight into the mechanisms of non-perturbative QCD it is essential to understand the excitation pattern of baryons. Up to now only the nucleon excitation spectrum has been subject to systematic experimental studies, while very little is known on excited states of double or triple strange baryons. In studies of antiproton-proton collisions the PANDA experiment is well-suited for a comprehensive baryon spectroscopy program in the multi-strange sector. A large fraction of the inelastic pp cross section is associated to final states with a baryon-antibaryon pair together with additional mesons, giving access to excited states both in the baryon and the antibaryon channel. For final states containing a 𝚵+ 𝚵- pair, cross sections up to µb are expected, corresponding to production rates of ~ 106/d at a luminosity L = 1031 cm-2 s-1. This study focuses on excited 𝚵- states decaying into ΛK-. A strategy to reconstruct the reaction pp → 𝚵+ 𝚵* and its charge conjugate channel with the PANDA detector will be presented.

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30

Mishra, Amruta, S. P. Misra, and W. Greiner. "In-medium decay widths of hidden and open charm vector mesons in a field theoretic model for composite hadrons." International Journal of Modern Physics E 24, no. 07 (July 2015): 1550053. http://dx.doi.org/10.1142/s0218301315500536.

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Анотація:

We calculate the decay widths of the charmonium states, J/ψ, ψ(3686) and ψ(3770), to [Formula: see text] pairs, as well as the decay width of D* → Dπ, in isospin asymmetric strange hadronic matter, using a field theoretical model for composite hadrons with quark constituents. For this purpose, we use the quark–antiquark pair creation term of the free Dirac Hamiltonian written in terms of the constituent quark field operators, and use explicit charmonium, D, [Formula: see text], D* and π states to evaluate the matrix elements for the charmonium as well as D* decay amplitudes. The medium modifications of the partial decay widths of charmonium to [Formula: see text] pair, arising from the mass modifications of the [Formula: see text] and the charmonium states calculated in a chiral effective model, are also included. The results of the present investigations are then compared with the decay widths computed earlier, in a model using light quark pair creation in 3P0 state. As in 3P0 model, the decay amplitude in the present model is multiplied with a strength parameter for the light quark pair creation, which is fitted from the observed vacuum decay width. The effects of the isospin asymmetry, the strangeness fraction of the hadronic matter on the masses of the charmonium states and [Formula: see text] mesons and hence on the decay widths, have also been studied. The isospin asymmetry effect is observed to be dominant for high densities, leading to appreciable difference in the decay channels of the charmonium to D+ D- and [Formula: see text] pairs. The decay width of D* → Dπ in the hadronic matter has also been calculated within the composite quark model in the present work, accounting for the medium modifications of the D and D* masses. The density modifications of the charmonium states and D(D*) mesons, which are observed to be appreciable at high densities, will be of relevance in the compressed baryonic matter (CBM) experiments at the future facility of FAIR, GSI, where charmed hadrons will be produced by annihilation of antiprotons on nuclei. The interactions of the charmonium states and D(D*) with the nuclear medium could lead to the possibility of the formation of exotic bound states of the nuclei with the (excited) charmonium states as well as with D(D*) mesons.

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31

Sett, Priyanka. "Study of strange mesons in p+p, d+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV." Journal of Physics: Conference Series 612 (May 19, 2015): 012063. http://dx.doi.org/10.1088/1742-6596/612/1/012063.

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32

Kim, Sang-Ho, Yongseok Oh, and A. I. Titov. "Decay Angular Distributions of K* and D* Mesons as a Tool for the Dynamics of Open Strange and Charm Production." Physics of Particles and Nuclei Letters 15, no. 4 (July 2018): 406–10. http://dx.doi.org/10.1134/s1547477118040131.

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33

Li, Wan-Xia, Xiao-Ming Xu, and H. J. Weber. "Cross sections for 2-to-1 meson–meson scattering." European Physical Journal C 81, no. 3 (March 2021). http://dx.doi.org/10.1140/epjc/s10052-021-09005-y.

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Анотація:

AbstractWe study the processes $$K{\bar{K}} \rightarrow \phi $$ K K ¯ → ϕ , $$\pi D \rightarrow D^*$$ π D → D ∗ , $$\pi {\bar{D}} \rightarrow {\bar{D}}^*$$ π D ¯ → D ¯ ∗ , and the production of $$\psi (3770)$$ ψ ( 3770 ) , $$\psi (4040)$$ ψ ( 4040 ) , $$\psi (4160)$$ ψ ( 4160 ) , and $$\psi (4415)$$ ψ ( 4415 ) mesons in collisions of charmed mesons or charmed strange mesons. The process of 2-to-1 meson–meson scattering involves a quark and an antiquark from the two initial mesons annihilating into a gluon and subsequently the gluon being absorbed by the spectator quark or antiquark. Transition amplitudes for the scattering process derive from the transition potential in conjunction with mesonic quark–antiquark wave functions and the relative-motion wave function of the two initial mesons. We derive these transition amplitudes in the partial wave expansion of the relative-motion wave function of the two initial mesons so that parity and total-angular-momentum conservation are maintained. We calculate flavor and spin matrix elements in accordance with the transition potential and unpolarized cross sections for the reactions using the transition amplitudes. Cross sections for the production of $$\psi (4040)$$ ψ ( 4040 ) , $$\psi (4160)$$ ψ ( 4160 ) , and $$\psi (4415)$$ ψ ( 4415 ) relate to nodes in their radial wave functions. We suggest the production of $$\psi (4040)$$ ψ ( 4040 ) , $$\psi (4160)$$ ψ ( 4160 ) , and $$\psi (4415)$$ ψ ( 4415 ) as probes of hadronic matter that results from the quark–gluon plasma created in ultrarelativistic heavy-ion collisions.

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34

Catalano, Fabio. "Measurement of D-meson production and flow in Pb–Pb collisions with ALICE at the LHC." International Journal of Modern Physics E, December 17, 2020, 2040004. http://dx.doi.org/10.1142/s0218301320400042.

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Анотація:

Open-charmed mesons are unique tools to study the properties of the Quark–Gluon Plasma (QGP) formed in ultra-relativistic nucleus–nucleus collisions. The nuclear modification factor ([Formula: see text]) and elliptic flow ([Formula: see text]) of [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] mesons were measured by the ALICE Collaboration in Pb–Pb collisions at [Formula: see text]. The D-meson [Formula: see text] provides information on the charm-quark interactions with the medium and the charm-quark energy loss. The D-meson elliptic flow at low transverse momentum ([Formula: see text]) gives insight into the participation of charm quarks in the collective expansion of the system and their possible in-medium thermalization. At high [Formula: see text], the [Formula: see text] is sensitive to the path-length dependence of parton energy loss. The role of the recombination mechanism is investigated measuring the [Formula: see text]-differential yield ratios between D-meson species with and without strange-quark content. Finally, the coupling of charm quarks to light quarks of the underlying medium is examined applying the Event-Shape Engineering (ESE) technique to the nonstrange D-meson elliptic flow.

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35

Acharya, S., D. Adamová, A. Adler, J. Adolfsson, G. Aglieri Rinella, M. Agnello, N. Agrawal, et al. "Measurement of beauty and charm production in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV via non-prompt and prompt D mesons." Journal of High Energy Physics 2021, no. 5 (May 2021). http://dx.doi.org/10.1007/jhep05(2021)220.

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Abstract The pT-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (|y|< 0.5) in proton-proton collisions at $$ \sqrt{s} $$ s = 5.02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19.3 ± 0.4) nb−1. D mesons were reconstructed from their decays D0→ K−π+, D+→ K−π+π+, and $$ {\mathrm{D}}_{\mathrm{s}}^{+}\to \upphi {\uppi}^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\uppi}^{+} $$ D s + → ϕ π + → K − K + π + and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and $$ {\mathrm{D}}_{\mathrm{s}}^{+} $$ D s + mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The $$ \mathrm{b}\overline{\mathrm{b}} $$ b b ¯ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is $$ \mathrm{d}{\sigma}_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y\left|{}_{\left|\mathrm{y}\right|<0.5}=34.5\pm 2.4{\left(\mathrm{stat}\right)}_{-2.9}^{+4.7}\left(\mathrm{tot}.\mathrm{syst}\right)\right. $$ d σ b b ¯ / d y y < 0.5 = 34.5 ± 2.4 stat − 2.9 + 4.7 tot . syst μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.

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36

Chen, Rui. "Strong decays of the newly $$P_{cs}(4459)$$ as a strange hidden-charm $$\Xi _c{\bar{D}}^*$$ molecule." European Physical Journal C 81, no. 2 (February 2021). http://dx.doi.org/10.1140/epjc/s10052-021-08904-4.

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AbstractIn our former work [arXiv:2011.07214], the $$P_{cs}(4459)$$ P cs ( 4459 ) observed by the LHCb Collaboration can be explained as a coupled strange hidden-charm $$\Xi _c{\bar{D}}^*/\Xi _c^*{\bar{D}}/\Xi _c'{\bar{D}}^*/\Xi _c^*{\bar{D}}^*$$ Ξ c D ¯ ∗ / Ξ c ∗ D ¯ / Ξ c ′ D ¯ ∗ / Ξ c ∗ D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . Here, we further discuss the two-body strong decay behaviors of the $$P_{cs}(4459)$$ P cs ( 4459 ) in the meson-baryon molecular scenario by input the former obtained bound solutions. Our results support the $$P_{cs}(4459)$$ P cs ( 4459 ) as the strange hidden-charm $$\Xi _c{\bar{D}}^*$$ Ξ c D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . The relative decay ratio between $$\Lambda _cD_s^*$$ Λ c D s ∗ and $$J/\psi \Lambda $$ J / ψ Λ is around 10, where the partial decay width for the $$\Lambda _cD_s^*$$ Λ c D s ∗ channel is around 0.6 to 2.0 MeV.

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37

Wang, Jun-Zhang, Qin-Song Zhou, Xiang Liu, and Takayuki Matsuki. "Toward charged $$Z_{cs}(3985)$$ structure under a reflection mechanism." European Physical Journal C 81, no. 1 (January 2021). http://dx.doi.org/10.1140/epjc/s10052-021-08877-4.

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AbstractVery recently, the BESIII Collaboration reported a charged hidden-charm structure with strangeness in the recoil mass of $$K^+$$ K + of a process $$e^+e^-\rightarrow D_s^{*-}D^0K^+$$ e + e - → D s ∗ - D 0 K + or $$D_s^{-}D^{*0}K^+$$ D s - D ∗ 0 K + , which is named as $$Z_{cs}(3985)^{-}$$ Z cs ( 3985 ) - . The newly observed charged structure can be treated as a partner structure with strangeness of well-known $$Z_{c}(3885)^{-}$$ Z c ( 3885 ) - reported in a process $$e^+e^-\rightarrow D^{*-}D^0\pi ^+$$ e + e - → D ∗ - D 0 π + . In this work, we propose a reflection picture to understand the nature of $$Z_{cs}(3985)$$ Z cs ( 3985 ) . By performing a combined analysis for the line shape of the recoil mass distribution of $$K^+$$ K + at five energy points $$\sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$$ s = 4.628 , 4.641 , 4.661 , 4.681 , 4.698 GeV, we find that the $$Z_{cs}(3985)$$ Z cs ( 3985 ) can be explained as a reflection structure of charmed-strange meson $$D_{s2}^{*}(2573)$$ D s 2 ∗ ( 2573 ) , which is produced from the open-charm decay of Y(4660) with a $$D_s^*$$ D s ∗ meson. Furthermore, we predicted the angular distribution of final state $$D_s^{*-}$$ D s ∗ - in process $$e^+e^-\rightarrow D_s^{*-}D^0K^+$$ e + e - → D s ∗ - D 0 K + based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $$Z_{cs}(3985)$$ Z cs ( 3985 ) further.

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38

Bazavov, A., C. E. DeTar, D. Du, A. X. El-Khadra, E. Gámiz, Z. Gelzer, S. Gottlieb, et al. "Semileptonic form factors for $$B\rightarrow D^*\ell \nu $$ at nonzero recoil from $$2+1$$-flavor lattice QCD." European Physical Journal C 82, no. 12 (December 16, 2022). http://dx.doi.org/10.1140/epjc/s10052-022-10984-9.

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AbstractWe present the first unquenched lattice-QCD calculation of the form factors for the decay $$B\rightarrow D^*\ell \nu $$ B → D ∗ ℓ ν at nonzero recoil. Our analysis includes 15 MILC ensembles with $$N_f=2+1$$ N f = 2 + 1 flavors of asqtad sea quarks, with a strange quark mass close to its physical mass. The lattice spacings range from $$a\approx 0.15$$ a ≈ 0.15 fm down to 0.045 fm, while the ratio between the light- and the strange-quark masses ranges from 0.05 to 0.4. The valence b and c quarks are treated using the Wilson-clover action with the Fermilab interpretation, whereas the light sector employs asqtad staggered fermions. We extrapolate our results to the physical point in the continuum limit using rooted staggered heavy-light meson chiral perturbation theory. Then we apply a model-independent parametrization to extend the form factors to the full kinematic range. With this parametrization we perform a joint lattice-QCD/experiment fit using several experimental datasets to determine the CKM matrix element $$|V_{cb}|$$ | V cb | . We obtain $$\left| V_{cb}\right| = (38.40 \pm 0.68_{\text {th}} \pm 0.34_{\text {exp}} \pm 0.18_{\text {EM}})\times 10^{-3}$$ V cb = ( 38.40 ± 0 . 68 th ± 0 . 34 exp ± 0 . 18 EM ) × 10 - 3 . The first error is theoretical, the second comes from experiment and the last one includes electromagnetic and electroweak uncertainties, with an overall $$\chi ^2\text {/dof} = 126/84$$ χ 2 /dof = 126 / 84 , which illustrates the tensions between the experimental data sets, and between theory and experiment. This result is in agreement with previous exclusive determinations, but the tension with the inclusive determination remains. Finally, we integrate the differential decay rate obtained solely from lattice data to predict $$R(D^*) = 0.265 \pm 0.013$$ R ( D ∗ ) = 0.265 ± 0.013 , which confirms the current tension between theory and experiment.

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39

Wang, Di, Cai-Ping Jia, and Fu-Sheng Yu. "A self-consistent framework of topological amplitude and its SU(N) decomposition." Journal of High Energy Physics 2021, no. 9 (September 2021). http://dx.doi.org/10.1007/jhep09(2021)126.

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Abstract We propose a systematic theoretical framework for the topological amplitudes of the heavy meson decays and their SU(N) decomposition. In the framework, the topologies are expressed in invariant tensors and classified into tree- and penguin-operator-induced diagrams according to which four-quark operators, tree or penguin, being inserted into their effective weak vertexes. The number of possible topologies contributing to one type of decay can be counted by permutations and combinations. The Wigner-Eckhart theorem ensures the topological amplitudes under flavor symmetry are the same for different decay channels. By decomposing the four-quark operators into irreducible representations of SU(N) group, one can get the SU(N) irreducible amplitudes. Taking the D → PP decay (P denoting a pseudoscalar meson) with SU(3)F symmetry as an example, we present our framework in detail. The linear correlation of topologies in the SU(3)F limit is clarified in group theory. It is found there are only nine independent topologies in all tree- and penguin-operator-induced diagrams contributing to the D → PP decays in the Standard Model. If a large quark-loop diagram, named TLP, is assumed, the large ∆ACP and the very different D0→ K+K− and D0→ π+π− branching fractions can be explained with a normal U-spin breaking. Moreover, our framework provides a simple way to analyze the SU(N) breaking effects. The linear SU(3)F breaking and the high order U-spin breaking in charm decays are re-investigated in our framework, which are consistent with literature. Analogous to the degeneracy and splitting of energy levels, we propose the concepts of degeneracy and splitting of topologies to describe the flavor symmetry breaking effects in decay. As applications, we analyze the strange-less D decays in SU(3)F symmetry breaking into Isospin symmetry and the charm-less B decays in SU(4)F symmetry breaking into SU(3)F symmetry.

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40

Tsushima, K. "Magnetic moments of the octet, decuplet, low-lying charm, and low-lying bottom baryons in a nuclear medium." Progress of Theoretical and Experimental Physics, March 16, 2022. http://dx.doi.org/10.1093/ptep/ptac050.

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Abstract We study the magnetic moments of the octet, decuplet, low-lying charm, and low-lying bottom baryons with nonzero light quarks in symmetric nuclear matter using the quark-meson coupling (QMC) model, which satisfies the constraint for the allowed maximum change (swelling) of the in-medium nucleon size derived from the y-scaling data for 3He(e, e′) and 56Fe(e, e′). This is the first study to estimate the in-medium magnetic moments of the low-lying charm and bottom baryons with nonzero light quarks. The present QMC model also satisfies the expected allowed maximum enhancement of the nucleon magnetic moments in nuclear matter. Moreover, it has been proven that the calculated in-medium to free proton electromagnetic form factor (EMFF) ratios calculated within the QMC model, reproduce well the proton EMFF super ratio extracted from $^4{\rm He}(\vec{e},e^{\prime }\vec{p})^3{\rm H}$ at Jefferson Laboratory (JLab). The medium modifications of the magnetic moments are estimated by evaluating the in-medium to free space baryon magnetic moment ratios to compensate the MIT bag deficiency to describe the free space octet baryon magnetic moments, where ratios are often measured directly in experiments even without knowing the absolute values, such as the free and bound proton electromagnetic form factors, as well as the European Muon Collaboration (EMC) effect to extract the structure function F2 ratio of the bound to free nucleons by the corresponding cross section ratio. We also present the results calculated with the different current quark mass values for the strange and bottom quarks to see the possible impact. Furthermore, for a practical use, we give the explicit density dependent parametrizations for the vector potentials of the baryons and light-(u, d) quarks, as well as for the effective masses of the baryons treated in this study, and of the mesons, ω, ρ, K, K*, η, η′, D, D*, B, and B*.

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41

Kumar, Arvind, and Amruta Mishra. "D-mesons and charmonium states in hot isospin asymmetric strange hadronic matter." European Physical Journal A 47, no. 12 (December 2011). http://dx.doi.org/10.1140/epja/i2011-11164-6.

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42

Dobbs, Sean. "Strange hadron spectroscopy with the KLong facility at Jefferson lab." Suplemento de la Revista Mexicana de Física 3, no. 3 (June 8, 2022). http://dx.doi.org/10.31349/suplrevmexfis.3.0308032.

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Анотація:

The strange quark hadrons sit at an important crossroads between the light and heavy quark hadrons, but their spectrum is comparatively poorly known. The KLF experiment was recently approved to run in Hall D of Jefferson Lab, and will use an intense secondary beam of KL mesons with the existing GlueX spectrometer to collect data several orders of magnitude larger than existing dataset. In this talk, I will discuss the expected physics reach of this experiment and the status of its preparations

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43

Segovia, J., C. Albertus, E. Hernández, F. Fernández, and D. R. Entem. "NonleptonicB→D(*)DsJ(*)decays and the nature of the orbitally excited charmed-strange mesons." Physical Review D 86, no. 1 (July 10, 2012). http://dx.doi.org/10.1103/physrevd.86.014010.

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44

Braghin, Fabio L. "Strangeness content of the pion in the U(3) Nambu-Jona-Lasinio model." Journal of Physics G: Nuclear and Particle Physics, January 20, 2022. http://dx.doi.org/10.1088/1361-6471/ac4d79.

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Анотація:

Abstract The Nambu-Jona-Lasinio model is considered with flavor-dependent coupling constants $G_{ij} \left[ ( \bar{\psi} \lambda_i \psi ) ( \bar{\psi} \lambda_j \psi ) + ( \bar{\psi} i\gamma_5 \lambda_i \psi ) ( \bar{\psi} i \gamma_5\lambda_j \psi ) \right]$ for $i,j=0,1..N_f^2-1$, and $N_f=3$. A self consistent calculation of quark effective masses and coupling constants is performed making the strange quark effective mass to vary considerably. Quantum mechanical mixings between up, down and strange constituent quarks yields a strangeness content of the light u and d quarks constituent and of the pion. Different types of estimates for the strangeness contribution for the pion mass are provided. Mixing type interactions, $G_{i\neq j}$, induce the light mesons mixings and estimates for the $\pi^0-\eta$ and $\eta-\eta'$ mixings are provided. The $\eta-\pi^0$ mixing is argued to be an indication of the strangeness content of the pion.

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45

Song, Qin-Tao, Dian-Yong Chen, Xiang Liu, and Takayuki Matsuki. "$$D_{s1}^*(2860)$$ D s 1 ∗ ( 2860 ) and $$D_{s3}^*(2860)$$ D s 3 ∗ ( 2860 ) : candidates for $$1D$$ 1 D charmed-strange mesons." European Physical Journal C 75, no. 1 (January 2015). http://dx.doi.org/10.1140/epjc/s10052-015-3265-4.

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46

Song, Jun, Hai-hong Li, and Feng-lan Shao. "Elliptic flow of hadrons in equal-velocity quark combination mechanism in relativistic heavy-ion collisions." European Physical Journal C 81, no. 1 (January 2021). http://dx.doi.org/10.1140/epjc/s10052-020-08760-8.

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AbstractWe apply a quark combination model with equal-velocity combination (EVC) approximation to study the elliptic flow ($$v_{2}$$ v 2 ) of hadrons in heavy-ion collisions in a wide collision energy range ($$\sqrt{s_{NN}}=$$ s NN = 27–5020 GeV). Utilizing the simple relationship between $$v_{2}$$ v 2 of hadrons and those of quarks under EVC, we find that $$v_{2}$$ v 2 of up/down quarks obtained by experimental data of proton is consistent with that obtained by data of $$\varLambda $$ Λ and $$\varXi $$ Ξ . $$v_{2}$$ v 2 of strange quarks obtained by data of $$\varOmega $$ Ω is consistent with that obtained by data of $$\varLambda $$ Λ and $$\varXi $$ Ξ , and at RHIC energies it is also consistent with that obtained by data of $$\phi $$ ϕ . This means that $$v_{2}$$ v 2 of these hadrons have a common quark-level source. Using data of $$D^0$$ D 0 , we obtain $$v_{2}$$ v 2 of charm quarks with $$p_T\lesssim 6$$ p T ≲ 6 GeV/c. We find that under EVC charm quark dominates $$v_{2}$$ v 2 of D mesons at low $$p_{T}$$ p T but light-flavor quarks significantly contribute to $$v_{2}$$ v 2 of D mesons in the range $$3\lesssim p_{T}\lesssim 8$$ 3 ≲ p T ≲ 8 GeV/c. We predict $$v_{2}$$ v 2 of charmed baryons $$\varLambda _{c}^{+}$$ Λ c + and $$\varXi _{c}^{0}$$ Ξ c 0 which show a significant enhancement at intermediate $$p_{T}$$ p T due to the double contribution of light-flavor quarks. The properties of the obtained quark $$v_{2}$$ v 2 under EVC are studied and a regularity for $$v_{2}$$ v 2 of quarks as the function of $$p_{T}/m$$ p T / m is found.

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47

Pandya, Bhoomika, Manan N. Shah, and P. C. Vinodkumar. "Mass spectroscopy, decays and mixing parameters of open flavour bottom and bottom strange mesons using instanton induced potential with additional confinement." Journal of Physics G: Nuclear and Particle Physics, January 19, 2023. http://dx.doi.org/10.1088/1361-6471/acb4b1.

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Анотація:

Abstract The mass spectra for the heavy-light $(b\bar{q}) ;$ $q = u$ or $d$ and $s$ bottom and bottom strange mesons are computed based on the instanton induced interactions inspired potential along with additional confinement term. Spectroscopic predictions for ground, radial and orbital states are provided. The low-lying states $1S$ and $1P$ are found to be in an excellent agreement with the PDG reported values. The predicted mass spectra strongly support the newly observed $B_J(5840)$ and $B_J(5970)$ by $LHCb$ collaboration as $2^1S_0$ and $1^3D_3$ states respectively. Apart from the mass spectra, the other observables like radiative transitions, decay constant for $1S$ state, the di-leptonic rare decays and the Cabibbo allowed two body hadronic decays are also predicted. The predicted value of branching ratio of rare decay $B_s^0 \rightarrow \mu^+ \mu^-$ as 3.65 $\times 10^{-9}$ is in excellent agreement with the recent measurement of $LHCb$ of $(3.09^{+0.46}_{-0.43}) \times 10^{-9}$. The branching ratios of color favoured decays $B_{(s)} \rightarrow D^{(*)-}_{(s)} \ \pi^+$ and $B_{(s)} \rightarrow D^{(*)-}_{(s)} \ \rho^+$ are found to be exceeding by factor of two as compared to the PDG listed values. The mixing parameters of $B^0_q - \bar{B^0_q}$, $\Delta M_q, x_q$ and $\chi_q$ are obtained as $0.512$, $0.755$ and $0.1877$ respectively which are very close to the PDG listed values of $0.5065 \pm 0.0019$, $0.769 \pm 0.004$ and $0.1858 \pm 0.0011$ respectively.

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