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Articles de revues sur le sujet « Bc meson »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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1

Chen, Yu-Qi. « Production of the Bc Meson ». International Journal of Modern Physics A 12, no 22 (10 septembre 1997) : 4039–48. http://dx.doi.org/10.1142/s0217751x9700219x.

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The production of the Bc and [Formula: see text] mesons was studied in the framework of the factorization formalism and perturbative QCD. Predicted results implied that an observable number of Bc and [Formula: see text] events can be produced at LEP I and at Tevatron. The fragmentation approximation describes the production of the Bc and [Formula: see text] mesons very well in high energy e+ e- collisions. In hadronic collisions, it is valid when and only when the transverse momentum PT of the produced Bc and [Formula: see text] is much larger than the mass of the Bc meson.
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2

Falmagne, Guillaume. « First measurement of the Bc+ meson nuclear modification factor in PbPb collisions with CMS ». EPJ Web of Conferences 259 (2022) : 12011. http://dx.doi.org/10.1051/epjconf/202225912011.

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The Bc+ meson is observed in lead-lead and proton-proton collisions at a center-of-mass energy per nucleon pair of √SNN = 5.02 TeV, via the Bc+ → (J/ψ → μ+μ−)μ+vμ decay and using 2017 and 2018 data from the CMS detector. The resulting Bc+ nuclear modification factor is measured in two bins of the trimuon transverse momentum and of the collision centrality. Less suppression is observed than for other quarkonia and most open heavy flavour mesons. This first observation of the Bc+ meson in heavy ion collisions will shed light on the interplay of suppression and enhancement mechanisms in the production of heavy-flavor mesons in the quark-gluon plasma.
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3

Veliev, E. Veli, K. Azizi, H. Sundu et N. Akşit. « Bc Meson at Finite Temperature ». Nuclear Physics B - Proceedings Supplements 219-220 (octobre 2011) : 170–73. http://dx.doi.org/10.1016/j.nuclphysbps.2011.10.091.

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4

Abreu, P., W. Adam, T. Adye, I. Ajinenko, G. D. Alekseev, R. Alemany, P. P. Allport et al. « Search for the Bc meson ». Physics Letters B 398, no 1-2 (avril 1997) : 207–22. http://dx.doi.org/10.1016/s0370-2693(97)00254-2.

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5

Itoh, C., T. Minamikawa, K. Miura et T. Watanabe. « Bs and Bc meson masses ». Il Nuovo Cimento A 105, no 10 (octobre 1992) : 1539–48. http://dx.doi.org/10.1007/bf02731983.

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6

Chang, Chao-Hsi, Jian-Ping Cheng et Cai-Dian Lü. « Radiative leptonic decays of Bc meson ». Physics Letters B 425, no 1-2 (avril 1998) : 166–70. http://dx.doi.org/10.1016/s0370-2693(98)00177-4.

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7

Jamshidi, S., R. Sepahvand et S. Dadfar. « Production of Bc Meson at NLO ». International Journal of Theoretical Physics 59, no 8 (13 juillet 2020) : 2255–70. http://dx.doi.org/10.1007/s10773-020-04457-6.

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8

Chang (Zhao-Xi Zhang), Chao-Hsi. « Production and decay of the meson Bc ». International Journal of Modern Physics A 21, no 04 (10 février 2006) : 777–84. http://dx.doi.org/10.1142/s0217751x06032022.

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Studies on the decay and production of [Formula: see text] meson are briefly reviewed. Considering RUN-II of Tevatron and the schedule of LHC, the theoretical studies of Bc meson will jump to a new stage not only for itself but also to implement the studies of the heavy quarkonia etc.
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9

Berezhnoy, A. V., et I. N. Belov. « D-wave Bc meson production at LHC ». Journal of Physics : Conference Series 1690 (décembre 2020) : 012089. http://dx.doi.org/10.1088/1742-6596/1690/1/012089.

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10

Cheung, Kingman. « Bc meson production at the Tevatron revisited ». Physics Letters B 472, no 3-4 (janvier 2000) : 408–11. http://dx.doi.org/10.1016/s0370-2693(99)01402-1.

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11

Chang, Chao-Hsi, Yu-Qi Chen, Guo-Ping Han et Hong-Tao Jiang. « On hadronic production of the Bc meson ». Physics Letters B 364, no 2 (décembre 1995) : 78–86. http://dx.doi.org/10.1016/0370-2693(95)01235-4.

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12

Cheung, Kingman, et Tzu Chiang Yuan. « Bc meson productions via induced gluon fragmentation ». Physics Letters B 325, no 3-4 (avril 1994) : 481–87. http://dx.doi.org/10.1016/0370-2693(94)90043-4.

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13

Sun, Junfeng, Yueling Yang, Qin Chang, Gongru Lu et Jinshu Huang. « Υ(nS)→Bc⁎π,Bc⁎KDecays with Perturbative QCD Approach ». Advances in High Energy Physics 2016 (2016) : 1–9. http://dx.doi.org/10.1155/2016/4893649.

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Besides the traditional strong and electromagnetic decay modes,Υ(nS)meson can also decay through the weak interactions within the standard model of elementary particle. With anticipation of copiousΥ(nS)data samples at the running LHC and coming SuperKEKB experiments, the two-body nonleptonic bottom-changingΥ(nS)→Bc⁎π,Bc⁎Kdecays (n=1,2,3) are investigated with perturbative QCD approach firstly. The absolute branching ratios forΥ(nS)→Bc⁎πandBc⁎Kdecays are estimated to reach up to about10-10and10-11, respectively, which might possibly be measured by the future experiments.
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14

NOBARY, M. A. GOMSHI, et T. O'SATI. « FRAGMENTATION FUNCTIONS FOR Bc AND $B^*_c$ MESONS WITH DEFINITE POLARIZATION ». Modern Physics Letters A 15, no 07 (7 mars 2000) : 455–64. http://dx.doi.org/10.1142/s021773230000044x.

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We present exact fragmentation functions for the production of S-wave Bc and [Formula: see text] mesons splitting out of a [Formula: see text]-antiquark. We distinguish transverse and longitudinal polarizations of [Formula: see text] which is important in hadronic spin properties of such states. Input parameters for our functions are quark masses, meson decay constants, and the transverse momentum for the hard production mechanism. Evolution of such functions from fragmentation scale up to an appropriate factorization scale are given. We compare our results with similar ones in the literature.
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15

HUANG, TAO, ZUO-HONG LI, XING-GANG WU et FEN ZUO. « SEMILEPTONIC B(Bs, Bc) DECAYS IN THE LIGHT-CONE QCD SUM RULES ». International Journal of Modern Physics A 23, no 21 (20 août 2008) : 3237–45. http://dx.doi.org/10.1142/s0217751x0804189x.

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Semileptonic B(Bs, Bc) decays are investigated systematically in the light-cone QCD sum rules. Special emphasis is put on the LCSR calculation on weak form factors with an adequate chiral current correlator, which turns out to be particularly effective to control the pollution by higher twist components of spectator mesons. The result for each channel depends on the distribution amplitude of the the producing meson. The leading twist distribution amplitudes of the related heavy mesons and charmonium are worked out by a model approach in the reasonable way. A practical scenario is suggested to understand the behavior of weak form factors in the whole kinematically accessible ranges. The decay widths and branching ratios are estimated for several B(Bc) decay modes of current interest.
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16

PATHAK, KRISHNA KINGKAR, et D. K. CHOUDHURY. « SEMILEPTONIC DECAY OF Bc MESON INTO $c\bar c$ STATES IN A QCD POTENTIAL MODEL ». International Journal of Modern Physics A 28, no 19 (30 juillet 2013) : 1350097. http://dx.doi.org/10.1142/s0217751x13500978.

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The slope and curvature of Isgur–Wise function for Bc meson is computed in a QCD potential model in two different approaches of choosing the perturbative term of the Cornell potential. Based on heavy quark effective theory the exclusive semileptonic decay rates of Bc meson into the [Formula: see text] states are exploited. Spin symmetry breaking effects are ignored up to a particular point and the form factors are connected with Isgur–Wise function for other kinematic point since the recoil momentum of [Formula: see text] from Bc is small due to its heavy mass.
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17

CHEU, ELLIOTT. « PROPERTIES OF HEAVY MESON STATES : B** and Bc ». International Journal of Modern Physics A 20, no 16 (30 juin 2005) : 3664–68. http://dx.doi.org/10.1142/s0217751x05027242.

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Using data collected with the DØ detector in Run II of the Tevatron, we study decays of the B** and [Formula: see text] meson. For the first time the separation of the specific excited states B1 and [Formula: see text] has been observed. In addition, we use the Bc candidates to measure the mass and the lifetime of the Bc.
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18

Лазур, В. Ю., В. В. Рубіш, О. К. Рейтій et С. І. Мигалина. « Description of mass spectrum of Bc-meson family ». Scientific Herald of Uzhhorod University.Series Physics 46 (26 novembre 2019) : 107–17. http://dx.doi.org/10.24144/2415-8038.2019.46.107-117.

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19

Aliev, T. M., et O. Yilmaz. « Properties of Bc-meson in QCD sum rules ». Il Nuovo Cimento A 105, no 6 (juin 1992) : 827–33. http://dx.doi.org/10.1007/bf02799097.

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20

BHATTACHARYA, A., B. CHAKRABARTI, T. SARKHEL et S. N. BANERJEE. « DEPENDENCE OF |Vcb| ON FERMI MOMENTUM ». International Journal of Modern Physics A 15, no 14 (10 juin 2000) : 2053–58. http://dx.doi.org/10.1142/s0217751x00000835.

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The Fermi momentum Pf for the Bc meson has been estimated in the framework of the statistical model. The matrix element |Vcb| has been extracted from the lepton energy spectrum using the estimated value of the Fermi momentum, in the framework of the ACCMM model. The value of Pf for Bc meson has been estimated as Pf=1.14 GeV which is somewhat large compared to the existing estimates.
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21

Goswami, J., D. Chakrabarti et S. Basak. « Mass spectroscopy using Borici–Creutz fermions on 2D lattice ». International Journal of Modern Physics A 32, no 11 (13 avril 2017) : 1750059. http://dx.doi.org/10.1142/s0217751x17500592.

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Minimally doubled fermion proposed by Creutz and Borici is a promising chiral fermion formulation on lattice. In this work, we present excited state mass spectroscopy for the meson bound states in Gross–Neveu model using Borici–Creutz (BC) fermion. We also evaluate the effective fermion mass as a function of coupling constant which shows a chiral phase transition at strong coupling. The lowest lying meson in two-dimensional QED is also obtained using BC fermion.
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22

CHOUDHURY, DEBAJYOTI, ANIRBAN KUNDU et BISWARUP MUKHOPADHYAYA. « TESTABLE SIGNALS OF CHARM DECAY IN THE Bc-MESON ». Modern Physics Letters A 16, no 22 (20 juillet 2001) : 1439–48. http://dx.doi.org/10.1142/s0217732301004650.

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The b and c quarks compete with each other in the decays of the Bc-meson. We show how one can obtain reliable signals of c→s decay in the Bc system in order to calculate the relative strengths of the two types of decays. This, we argue, can be done by considering the decay [Formula: see text], followed by semileptonic decays of the Bs. We suggest looking for like-sign dileptons together with a Ds at the BTeV or LHC-B experiments, and show that such signals can be made background-free by suitable event selection.
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23

Barate, R., D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte et al. « Search for the Bc meson in hadronic Z decays ». Physics Letters B 402, no 1-2 (juin 1997) : 213–26. http://dx.doi.org/10.1016/s0370-2693(97)00461-9.

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24

Ackerstaff, K., G. Alexander, J. Allison, N. Altekamp, K. J. Anderson, S. Anderson, S. Arcelli et al. « Search for the Bc meson in hadronic Z0 decays ». Physics Letters B 420, no 1-2 (février 1998) : 157–68. http://dx.doi.org/10.1016/s0370-2693(97)01569-4.

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25

Masetti, Marco, et Francesca Sartogo. « Perturbative predictions for Bc meson production in hadronic collisions ». Physics Letters B 357, no 4 (septembre 1995) : 659–65. http://dx.doi.org/10.1016/0370-2693(95)00908-4.

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26

KRONFELD, ANDREAS S., I. F. ALLISON, C. AUBIN, C. BERNARD, C. T. H. DAVIES, C. DETAR, M. DI PIERRO et al. « PREDICTIVE LATTICE QCD ». International Journal of Modern Physics A 21, no 04 (10 février 2006) : 713–19. http://dx.doi.org/10.1142/s0217751x06031934.

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In the past year, we calculated with lattice QCD three quantities that were unknown or poorly known. They are the q2 dependence of the form factor in semileptonic D → Klν decay, the decay constant of the D meson, and the mass of the Bc meson. In this talk, we summarize these calculations, with emphasis on their (subsequent) confirmation by experiments.
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27

Hernández, E., J. Nieves et J. M. Verde-Velasco. « Study of semileptonic and nonleptonic decays of the Bc - meson ». European Physical Journal A 31, no 4 (mars 2007) : 714–17. http://dx.doi.org/10.1140/epja/i2006-10270-x.

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28

Paoletti, Simone. « χc production and search for the Bc meson at LEP ». Nuclear Physics B - Proceedings Supplements 55, no 1 (avril 1997) : 105–10. http://dx.doi.org/10.1016/s0920-5632(97)00160-6.

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29

Issadykov, Aidos. « Study of the Bc → J/ψ + D(*)q decays in covariant confined quark model ». EPJ Web of Conferences 177 (2018) : 09007. http://dx.doi.org/10.1051/epjconf/201817709007.

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In this work we study the Bc → J/ψ + D(*)q decays. It was defined ratios (RD*s/Ds, RD*/D, RD*/D*s and RD/Ds) of nonleptonic branching ratios of Bc meson, which will be hopefully tested on LHC experiments. We compare the obtained results with available experimental data and with the results from other theoretical approaches.
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30

Berezhnoy, A. V., I. N. Belov, A. K. Likhoded et A. V. Luchinsky. « Bc excitations at LHC : first observations and further research prospects ». EPJ Web of Conferences 222 (2019) : 02009. http://dx.doi.org/10.1051/epjconf/201922202009.

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Status of the Bc meson excitatons search is presented in our work. We discuss the 2S Bc states first discovered by ATLAS and newly confirmed by CMS and LHCb collaborations. We review the observation prospects for the rest predicted states (B∗c, 2P wave, 3P wave and D wave) at LHC experiments. Cascade decays to the ground state as well as direct decays to the lepton pair are regarded for these states.
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31

Anisimov, A. Yu, I. M. Narodetskii, C. Semay et B. Silvestre-Brac. « The Bc meson lifetime in the light-front constituent quark model ». Physics Letters B 452, no 1-2 (avril 1999) : 129–36. http://dx.doi.org/10.1016/s0370-2693(99)00273-7.

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32

Kiselev, V. V., A. K. Likhoded et A. I. Onishchenko. « Semileptonic Bc-meson decays in sum rules of QCD and NRQCD ». Nuclear Physics B 569, no 1-3 (mars 2000) : 473–504. http://dx.doi.org/10.1016/s0550-3213(99)00505-2.

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33

Chang, Chao-Hsi, Chafik Driouichi, Paula Eerola et Xing-Gang Wu. « BCVEGPY : an event generator for hadronic production of the Bc meson ». Computer Physics Communications 159, no 3 (juin 2004) : 192–224. http://dx.doi.org/10.1016/j.cpc.2004.02.005.

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34

Dominguez, C. A., K. Schilcher et Y. L. Wu. « QCD determination of the leptonic decay constant of the Bc-meson ». Physics Letters B 298, no 1-2 (janvier 1993) : 190–94. http://dx.doi.org/10.1016/0370-2693(93)91729-7.

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35

IKHDAIR, SAMEER M., et RAMAZAN SEVER. « Bc AND HEAVY MESON SPECTROSCOPY IN THE LOCAL APPROXIMATION OF THE SCHRÖDINGER EQUATION WITH RELATIVISTIC KINEMATICS ». International Journal of Modern Physics A 20, no 17 (10 juillet 2005) : 4035–54. http://dx.doi.org/10.1142/s0217751x05022275.

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We present bound state masses of the self-conjugate and non-self-conjugate mesons in the context of the Schrödinger equation taking into account the relativistic kinematics and the quark spins. We apply the usual interaction by adding the spin dependent correction. The hyperfine splittings for the 2S charmonium and 1S bottomonium are calculated. The pseudoscalar and vector decay constants of the Bc meson and the unperturbed radial wave function at the origin are also calculated. We have obtained a local equation with a complete relativistic corrections to a class of three attractive static interaction potentials of the general form V(r) = -Ar-β+κrβ+V0, with β = 1, 1/2, 3/4 which can also be decomposed into scalar and vector parts in the form VV(r) = -Ar-β+(1-∊)κrβ and VS(r) = ∊κrβ+V0; where 0≤∊≤1. The energy eigenvalues are carried out up to the third order approximation using the shifted large-N-expansion technique.
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36

Choi, Myoung-Taek, et Jae Kwan Kim. « Determination of |Vcb| from the polarization of vector meson in the semileptonic decay of B and Bc meson ». Physics Letters B 419, no 1-4 (février 1998) : 377–80. http://dx.doi.org/10.1016/s0370-2693(97)01480-9.

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Onishchenko, A. I., et O. L. Veretin. « Two-loop QCD corrections to the leptonic constant of the Bc-meson ». European Physical Journal C 50, no 4 (15 mars 2007) : 801–8. http://dx.doi.org/10.1140/epjc/s10052-007-0255-1.

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38

Shen, Dandan, Huimin Ren, Fan Wu et Ruilin Zhu. « Bc → J/ψ tensor form factors at large momentum recoil ». International Journal of Modern Physics A 36, no 19 (3 juillet 2021) : 2150135. http://dx.doi.org/10.1142/s0217751x21501359.

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We present a next-to-leading order (NLO) relativistic correction to [Formula: see text] tensor form factors within nonrelativistic QCD (NRQCD). We also consider complete Dirac bilinears [Formula: see text] with [Formula: see text] matrices [Formula: see text] in the [Formula: see text] transition. The relation among different current form factors is given and it shows that symmetries emerge in the heavy bottom quark limit. For a phenomenological extension, we propose to extract the long-distance matrix elements (LDMEs) for [Formula: see text] meson from the recent HPQCD lattice data and the NLO form factors at large momentum recoil.
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39

Cui, Bo-Yan, Ai-Jun Ma, Ying-Ying Fan et Fu-Hu Liu. « Quasi-two-body decays Bc → ηc(1S,2S)D0∗+(2400) → ηc(1S,2S)D0π+ in the perturbative QCD approach ». International Journal of Modern Physics A 34, no 33 (30 novembre 2019) : 1950222. http://dx.doi.org/10.1142/s0217751x19502221.

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We extend our recent works on the resonant state [Formula: see text] in the quasi-two-body [Formula: see text] meson decays to the [Formula: see text] cases within the perturbative QCD approach. With the help of the two-meson distribution amplitudes, we calculate the [Formula: see text]-averaged branching fractions and direct [Formula: see text] violations of the quasi-two-body decays [Formula: see text] in this work. We also present the [Formula: see text] invariant mass dependence of the differential branching fraction for the considered decay modes. Our results could be tested by further experiments in the LHCb.
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40

Ikhdair, Sameer M., et Ramazan Sever. « Bc Meson Spectrum and Hyperfine Splittings in the Shifted Large-N-Expansion Technique ». International Journal of Modern Physics A 18, no 23 (20 septembre 2003) : 4215–31. http://dx.doi.org/10.1142/s0217751x03015088.

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In the framework of potential models for heavy quarkonium, we compute the mass spectrum of the bottom-charmed Bc meson system and spin-dependent splittings from the Schrödinger equation using the shifted-large-N expansion technique. The masses of the lightest vector [Formula: see text] and pseudoscalar Bc states as well as the higher states below the threshold are estimated. Our predicted result for the ground state energy is [Formula: see text] MeV and are generally in exact agreement with earlier calculations. Calculations of the Schrödinger energy eigenvalues are carried out up to the third order of the energy series. The parameters of each potential are adjusted to obtain best agreement with the experimental spin-averaged data (SAD). Our findings are compared with the observed data and with the numerical results obtained by other numerical methods.
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41

IKHDAIR, SAMEER M., et RAMAZAN SEVER. « CALCULATION OF THE Bc LEPTONIC DECAY CONSTANT USING THE SHIFTED N-EXPANSION METHOD ». International Journal of Modern Physics A 21, no 32 (30 décembre 2006) : 6699–714. http://dx.doi.org/10.1142/s0217751x06034100.

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We give a review and present a comprehensive calculation for the leptonic constant fBc of the low-lying pseudoscalar and vector states of Bc-meson in the framework of static and QCD-motivated nonrelativistic potential models taking into account the one-loop and two-loop QCD corrections in the short distance coefficient that governs the leptonic constant of Bc quarkonium system. Further, we use the scaling relation to predict the leptonic constant of the nS-states of the [Formula: see text] system. Our results are compared with other models to gauge the reliability of the predictions and point out differences.
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42

IKHDAIR, SAMEER M., et RAMAZAN SEVER. « MASS SPECTRA OF HEAVY QUARKONIA AND Bc DECAY CONSTANT FOR STATIC SCALAR-VECTOR INTERACTIONS WITH RELATIVISTIC KINEMATICS ». International Journal of Modern Physics A 20, no 28 (10 novembre 2005) : 6509–31. http://dx.doi.org/10.1142/s0217751x05021294.

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We reproduce masses of the self-conjugate and non-self-conjugate mesons in the context of the spinless Salpeter equation taking into account the relativistic kinematics and the quark spins. The hyperfine splittings for the 2S charmonium and 1S bottomonium are also calculated. Further, the pseudoscalar and vector decay constants of the Bc meson and the unperturbed radial wave function at the origin are also calculated. We have obtained a local equation with a complete relativistic corrections to a class of three attractive static interaction potentials of the general form V(r) = -Ar-β + κrβ + V0, with β = 1, 1/2, 3/4 decomposed into scalar and vector parts in the form VV(r) = -Ar-β + (1-∊)κrβ and VS(r) = ∊κrβ + V0; where 0≤∊≤1. We have used the shifted large-N-expansion technique (SLNET) to solve the reduced equation for the scalar (∊ = 1), equal mixture of scalar-vector (∊ = 1/2), and vector (∊ = 0) confinement interaction kernels. The energy eigenvalues are carried out up to the third order approximation.
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43

McNeil, M. « Search for Bc and ϒ in Hadronic Z Decays ». International Journal of Modern Physics A 12, no 22 (10 septembre 1997) : 3921–30. http://dx.doi.org/10.1142/s0217751x97002073.

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Out of 3.9 million hadronic Z decays collected by the ALEPH detector, a sample of approximately 700 J/ψ events decaying into e+ e- or μ+μ- are selected. A search for the Bc meson decaying into the channels J/ψπ+, J/ψe+νe and J/ψμ+νμ is then performed, resulting in the observation of 0, 1 and 1 candidate in each of these channels respectively, with 0.37, 0.28 and 0.36 background events expected. The following 90% confidence level upper limits are derived: [Formula: see text] An intriguing candidate, found in an independent analysis, is also described in detail. Using the same data sample, a search is performed for the ϒ(1S), ϒ(2S) and ϒ(3S) states, decaying into either e+e- or μ+μ-. After kinematic and topological cuts a total of 1.2 ± 0.4 background events are expected for both channels in the mass window chosen. Two events are observed, allowing the following 90% confidence level branching fraction upper limit to be derived: [Formula: see text]
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44

Mansour, Hesham, et Ahmed Gamal. « Bound State of Heavy Quarks Using a General Polynomial Potential ». Advances in High Energy Physics 2018 (17 décembre 2018) : 1–7. http://dx.doi.org/10.1155/2018/7269657.

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In the present work, the mass spectra of the bound states of heavy quarks cc-,bb-, and Bc meson are studied within the framework of the nonrelativistic Schrödinger’s equation. First, we solve Schrödinger’s equation with a general polynomial potential by Nikiforov-Uvarov (NU) method. The energy eigenvalues for any L- value is presented for a special case of the potential. The results obtained are in good agreement with the experimental data and are better than previous theoretical studies.
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45

Yang, Zhi, Xing-Gang Wu et Xian-You Wang. « BEEC : An event generator for simulating the Bc meson production at an e+e− collider ». Computer Physics Communications 184, no 12 (décembre 2013) : 2848–55. http://dx.doi.org/10.1016/j.cpc.2013.07.016.

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46

Jena, S. N., P. K. Nanda, S. Sahoo et S. Panda. « An independent quark model study of weak leptonic decays of pseudoscalar mesons ». International Journal of Modern Physics A 30, no 16 (9 juin 2015) : 1550092. http://dx.doi.org/10.1142/s0217751x1550092x.

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An independent quark model with a relativistic power-law potential is used to study the weak leptonic decays of light and heavy pseudoscalar mesons. The partial decay width and the decay constant for the weak leptonic decay are derived from the quark–antiquark momentum distribution amplitude which is obtained from the bound quark eigenfunction with the assumption of a strong correlation existing between quark–antiquark momenta inside the decaying meson in its rest frame. The model parameters are first determined from the application of the model to study the ground state hyperfine splitting of ρ, K, D, Ds, B, Bs and Bc mesons. The same model with no adjustable parameters is then used to evaluate the decay constants fM and the decay widths of pseudoscalar mesons. The model predictions agree quite well with the available experimental data as well as with those of several other models. The decay constant for pion and kaon are obtained as fπ = 132 MeV and fk = 161 MeV which closely agree with experimental values. But in case of heavier mesons for which experimental data are not yet available, the present model gives its predictions as fBC > fBS > fB, fDS > fD, fD > fB and fπ > fB which are in conformity with most of other model predictions. The model predictions of the corresponding decay widths and the branching ratios for the [Formula: see text] and [Formula: see text] decay modes are in close agreement with the available experimental data.
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47

Mahmood, Shakeel, Farida Tahir et Azeem Mir. « New physics through interference of nonstandard interactions with Standard Model in rare decays of Bc+ meson ». Modern Physics Letters A 33, no 30 (28 septembre 2018) : 1850171. http://dx.doi.org/10.1142/s0217732318501717.

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We investigate the nonstandard neutrino interactions (NSI) in the rare decays of [Formula: see text] mesons involving neutrinos in the final state. It is suggested that the interference between Standard Model and nonstandard interaction can provide sizeable contribution. We calculate the limits on NSI free parameters ([Formula: see text], [Formula: see text]) and compare them with experimental data.
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48

Chang, Chao-Hsi, Xian-You Wang et Xing-Gang Wu. « BCVEGPY2.2 : A newly upgraded version for hadronic production of the meson Bc and its excited states ». Computer Physics Communications 197 (décembre 2015) : 335–38. http://dx.doi.org/10.1016/j.cpc.2015.07.015.

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49

IKHDAIR, SAMEER M., et RAMAZAN SEVER. « SPECTROSCOPY OF Bc MESON IN A SEMI-RELATIVISTIC QUARK MODEL USING THE SHIFTED LARGE-N EXPANSION METHOD ». International Journal of Modern Physics A 19, no 11 (30 avril 2004) : 1771–91. http://dx.doi.org/10.1142/s0217751x0401780x.

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We calculate the [Formula: see text] mass spectrum, the splitting values and some other properties in the framework of the semirelativistic equation by applying the shifted large-N expansion technique. We use seven different central potentials together with an improved QCD-motivated interquark potentials calculated to two loops in the modified minimal-subtraction [Formula: see text] scheme. The parameters of these potentials are fitted to generate the semirelativistic bound states of [Formula: see text] quarkonium system in close conformity with the experimental and the present available calculated center-of-gravity (c.o.g.) data. Calculations of the energy bound states are carried out up to third order. Our results are in excellent fit with the results of the other works.
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50

Wang, Wei, et Ruilin Zhu. « Model-independent investigation of the RJ/ψ,ηc and ratios of decay widths of semileptonic Bc decays into a P-wave charmonium ». International Journal of Modern Physics A 34, no 31 (10 novembre 2019) : 1950195. http://dx.doi.org/10.1142/s0217751x19501951.

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Experimental measurements of decay branching fractions of semitaunic and semimuonic [Formula: see text] into [Formula: see text] have challenged the lepton flavor universality in standard models with about two standard deviations. In this paper, we first investigate the unitary constraint on form factors of [Formula: see text] meson into [Formula: see text]-wave and [Formula: see text]-wave charmonium. Such constraint leads to the exploration of the [Formula: see text] and other ratios [Formula: see text], [Formula: see text], and [Formula: see text] in a model-independent way. These results together with future experimental measurements can be used to explore the lepton flavor universality in a more systematic way. In addition, we point out that the helicity-dependent ratios [Formula: see text] and [Formula: see text] can also provide complementary information.
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