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Статті в журналах з теми "Momentum correlations"

Автор: Grafiati

Опубліковано: 20 квітня 2024

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1

Bożek, P., W. Broniowski, and S. Chatterjee. "Transverse Momentum Fluctuations and Correlations." Acta Physica Polonica B Proceedings Supplement 10, no. 4 (2017): 1091. http://dx.doi.org/10.5506/aphyspolbsupp.10.1091.

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2

Borghini, N. "Multiparticle correlations from momentum conservation." European Physical Journal C 30, no. 3 (October 2003): 381–85. http://dx.doi.org/10.1140/epjc/s2003-01265-6.

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3

Harris, John W., and Collaboration STAR. "High Transverse Momentum Correlations in STAR." Acta Physica Hungarica A) Heavy Ion Physics 21, no. 2-4 (November 1, 2004): 229–35. http://dx.doi.org/10.1556/aph.21.2004.2-4.20.

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4

Berger, Edmond L. "Momentum correlations in heavy-quark hadroproduction." Physical Review D 37, no. 7 (April 1, 1988): 1810–17. http://dx.doi.org/10.1103/physrevd.37.1810.

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5

Lorcé, Cédric. "Quark Spin-Orbit Correlations." International Journal of Modern Physics: Conference Series 37 (January 2015): 1560036. http://dx.doi.org/10.1142/s2010194515600368.

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Анотація:

The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark spin-orbit correlation can also be expressed more intuitively in terms of relativistic phase-space distributions, which can be seen as the mother distributions of the standard generalized and transverse-momentum dependent parton distributions. We present here for the first time some examples of the general multipole decomposition of these phase-space distributions.

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6

YANG, ZHENWEI, JIANPING CHENG, and XIANGMING SUN. "SPIN INTERACTION EFFECTS ON MOMENTUM CORRELATIONS FOR IDENTICAL FERMIONS EMITTED IN RELATIVISTIC HEAVY-ION COLLISIONS." Modern Physics Letters A 22, no. 02 (January 20, 2007): 131–39. http://dx.doi.org/10.1142/s0217732307020920.

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The Hanbury-Brown and Twiss (HBT) effects predict a Bose–Einstein enhancement of the two-particle momentum correlations of identical bosons at small relative momentum. However, the parallel momentum correlations between identical fermions are less argued. The momentum correlations can be altered by many factors, among which the spin interaction effects are discussed in this paper. It is found that the spin interaction plays an important role on the momentum correlations of identical fermions. For spin triplet state, a full Fermi–Dirac suppression represents as expected. On the contrary, a fake Bose–Einstein enhancement shows up for spin singlet state. The measured momentum correlations of fermions could hence provide some hints of spin interactions between them if all other factors such as Coulomb interactions were removed. Spin interactions make it more complicated to extract physical information from momentum correlations between fermions.

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7

SCHÄFER, BJÖRN MALTE. "GALACTIC ANGULAR MOMENTA AND ANGULAR MOMENTUM CORRELATIONS IN THE COSMOLOGICAL LARGE-SCALE STRUCTURE." International Journal of Modern Physics D 18, no. 02 (February 2009): 173–222. http://dx.doi.org/10.1142/s0218271809014388.

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I review the theory of angular momentum acquisition of galaxies by tidal torquing, the resulting angular momentum distribution and the angular momentum correlation function, and discuss the implications of angular momentum alignments for weak lensing measurements. Starting from linear models for tidal torquing, I summarize perturbative approaches and the results from n-body simulations of cosmic structure formation. Then I discuss the validity of decompositions of the tidal shear and inertia fields, the effects of angular momentum biasing, the applicability of parametrized angular momentum correlation models and the consequences of angular momentum correlations for shape alignments. I compile the results of observations of shape alignments in recent galaxy surveys as well as in n-body simulations. Finally, I review the contamination of weak lensing surveys by spin-induced shape alignments and methods for suppressing this contamination.

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8

Popescu, R., T. Glasmacher, J. D. Dinius, S. J. Gaff, C. K. Gelbke, D. O. Handzy, M. J. Huang, et al. "Sensitivity of two-fragment correlation functions to initial-state momentum correlations." Physical Review C 58, no. 1 (July 1, 1998): 270–80. http://dx.doi.org/10.1103/physrevc.58.270.

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9

ALVIOLI, MASSIMILIANO, CLAUDIO CIOFI DEGLI ATTI, LEONID P. KAPTARI, CHIARA BENEDETTA MEZZETTI, and HIKO MORITA. "UNIVERSALITY OF NUCLEON–NUCLEON SHORT-RANGE CORRELATIONS AND NUCLEON MOMENTUM DISTRIBUTIONS." International Journal of Modern Physics E 22, no. 08 (August 2013): 1330021. http://dx.doi.org/10.1142/s021830131330021x.

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By analyzing recent microscopic many-body calculations of few-nucleon systems and complex nuclei performed by different groups in terms of realistic nucleon–nucleon (NN) interactions, it is shown that NN short-range correlations (SRCs) have a universal character, in that the correlation hole that they produce in nuclei appears to be almost A-independent and similar to the correlation hole in the deuteron. The correlation hole creates high-momentum components, missing in a mean-field (MF) description and exhibiting several scaling properties and a peculiar spin–isospin structure. In particular, the momentum distribution of a pair of nucleons in spin–isospin state (ST) = (10), depending upon the pair relative (k rel ) and center-of-mass (c.m.) (K c.m. ) momenta, as well as upon the angle Θ between them, exhibits a remarkable property: in the region k rel ≳2 fm -1 and K c.m. ≲1 fm -1, the relative and c.m. motions are decoupled and the two-nucleon momentum distribution factorizes into the deuteron momentum distribution and an A-dependent momentum distribution describing the c.m. motion of the pair in the medium. The impact of these and other properties of one- and two-nucleon momentum distributions on various nuclear phenomena, on ab initio calculations in terms of low-momentum interactions, as well as on ongoing experimental investigations of SRCs, are briefly commented.

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10

Kumar, Suneel, and Rajeev K. Puri. "Role of momentum correlations in fragment formation." Physical Review C 58, no. 1 (July 1, 1998): 320–25. http://dx.doi.org/10.1103/physrevc.58.320.

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11

Laguna, H. G., and R. P. Sagar. "Position–momentum correlations in the Moshinsky atom." Journal of Physics A: Mathematical and Theoretical 45, no. 2 (December 9, 2011): 025307. http://dx.doi.org/10.1088/1751-8113/45/2/025307.

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12

Lowe, C. P., D. Frenkel, and A. J. Masters. "Long‐time tails in angular momentum correlations." Journal of Chemical Physics 103, no. 4 (July 22, 1995): 1582–87. http://dx.doi.org/10.1063/1.469780.

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13

Trainor, Thomas A., Duncan J. Prindle, and STAR Collaboration. "Transverse momentum correlations in relativistic nuclear collisions." Journal of Physics: Conference Series 27 (January 1, 2005): 134–43. http://dx.doi.org/10.1088/1742-6596/27/1/015.

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14

Rudenko, A. S. "T-odd triple momentum correlations in decays." Nuclear Physics B - Proceedings Supplements 225-227 (April 2012): 260–62. http://dx.doi.org/10.1016/j.nuclphysbps.2012.02.054.

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15

Buskulic et al., D. "Transverse momentum correlations in hadronic Z decays." Zeitschrift f�r Physik C Particles and Fields 73, no. 3 (February 14, 1997): 421–32. http://dx.doi.org/10.1007/s002880050331.

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16

ANDREEV, I. V., I. M. DREMIN, M. BIYAJIMA, and N. SUZUKI. "INTERMITTENCY AND BOSE-EINSTEIN CORRELATIONS." International Journal of Modern Physics A 10, no. 28 (November 10, 1995): 3951–83. http://dx.doi.org/10.1142/s0217751x95001856.

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Анотація:

The role of Bose-Einstein (BE) correlations in a widely discussed intermittency phenomenon is reviewed. In particular, it is shown that particle correlations of different origins are better displayed when analyzed as functions of appropriately chosen variables. Correspondingly, if the shape of the BE contribution is chosen to be Gaussian in three-momentum transferred, it provides the power-like law in four-momentum squared and is smeared out in (pseudo)rapidity. The increase in factorial moments in small cells of the phase space looks also different in different variables, which is ascribed to varying shares of various mechanisms of both dynamical (e.g. parton jets) and symmetry (BE correlations) origin.

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17

MASSEN, S. E., V. P. PSONIS, and A. N. ANTONOV. "INFORMATION ENTROPY AND NUCLEON CORRELATIONS IN NUCLEI." International Journal of Modern Physics E 14, no. 08 (November 2005): 1251–66. http://dx.doi.org/10.1142/s0218301305003843.

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We evaluated the information entropies in coordinate and momentum spaces and their sum (Sr, Sk, S) for many nuclei using "experimental" densities or/and momentum distributions. The results are compared with the harmonic oscillator model and with the short-range correlated distributions. Suppose A is the number of nuclei, it is found that Sr depends strongly on ln A and does not depend very much on the model. The behavior of Sk is the opposite. The various cases that we consider can be classified according to either the quantity of the experimental data that we use or by the values of S, i.e., the increase in the quality of the density and in the momentum distributions leads to an increase in the values of S. In all cases, apart from the linear relation S=a+b ln A, the linear relation S=aV+bV ln V also holds. V is the mean volume of the nucleus. If S is considered as an ensemble entropy, a relation between A or V and the ensemble volume can be found. Finally, comparing many different electron scattering experiments for the same nucleus, we found that the larger the momentum transfer ranges, the larger the information entropy is. It is concluded that S might be used to compare different experiments for the same nucleus, and to choose the most reliable one.

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18

Boucaud, Ph, F. De Soto, A. Le Yaouanc, and J. Rodri'guez-Quintero. "Are the low-momentum gluon correlations semiclassically determined?" Journal of High Energy Physics 2005, no. 03 (March 18, 2005): 046. http://dx.doi.org/10.1088/1126-6708/2005/03/046.

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19

Danielewicz, P., and S. Pratt. "Analysis of low-momentum correlations with Cartesian harmonics." Physics Letters B 618, no. 1-4 (July 2005): 60–67. http://dx.doi.org/10.1016/j.physletb.2005.05.019.

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20

Gamberg, Leonard P. "Transverse spin and momentum correlations in quantum chromodynamics." Pramana 72, no. 1 (January 2009): 55–68. http://dx.doi.org/10.1007/s12043-009-0005-z.

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21

GAUTAM, SAKSHI, and RAJNI KANT. "Fragmentation and momentum correlations in heavy-ion collisions." Pramana 78, no. 3 (February 17, 2012): 389–98. http://dx.doi.org/10.1007/s12043-011-0246-5.

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22

Nason, Paolo, and Carlo Oleari. "Momentum correlations in and the measurement of Rb0." Physics Letters B 387, no. 3 (October 1996): 623–28. http://dx.doi.org/10.1016/0370-2693(96)01060-x.

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23

Fai, George, Gábor Papp, and Péter Lévai. "Di-hadron correlations and parton intrinsic transverse momentum." Nuclear Physics A 774 (August 2006): 557–60. http://dx.doi.org/10.1016/j.nuclphysa.2006.06.086.

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24

Cattaruzza, E., A. Del Fabbro, and D. Treleani. "Fractional momentum correlations in multiparton collisions at LHC." Nuclear Physics A 782, no. 1-4 (February 2007): 350–55. http://dx.doi.org/10.1016/j.nuclphysa.2006.10.067.

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25

Osorio, Clara I., G. Molina-Terriza, and Juan P. Torres. "Orbital angular momentum correlations of entangled paired photons." Journal of Optics A: Pure and Applied Optics 11, no. 9 (August 5, 2009): 094013. http://dx.doi.org/10.1088/1464-4258/11/9/094013.

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26

Takahashi, Y., C. H. Chan, J. G. Duthie, J. C. Gregory, T. Hayashi, H. Yokomj, J. H. Derrickson, et al. "Transverse momentum distributions and particle correlations from EMU05." Nuclear Physics A 498 (July 1989): 529–33. http://dx.doi.org/10.1016/0375-9474(89)90635-0.

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27

Schumann, Frank O., Jürgen Kirschner, and Jamal Berakdar. "Imaging Momentum–Space Two‐Particle Correlations at Surfaces." physica status solidi (b) 257, no. 7 (February 20, 2020): 1900636. http://dx.doi.org/10.1002/pssb.201900636.

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28

Zhang, Yong, Jing Yang, and Wei-Ning Zhang. "Back-to-back correlations of boson–antiboson pairs for anisotropic expanding sources." International Journal of Modern Physics E 24, no. 10 (October 2015): 1550071. http://dx.doi.org/10.1142/s0218301315500718.

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In the hot and dense hadronic sources formed in high energy heavy-ion collisions, the particle interactions in medium might lead to a measurable back-to-back correlation (BBC) of boson–antiboson pairs. We calculate the BBC functions of ϕϕ and K+K- for anisotropic expanding sources. The dependences of the BBC on the particle momentum and source expanding velocity are investigated. The results indicate that the BBC functions increase with the magnitude of particle momentum and exhibit an obvious dependence on the direction of the momentum for the anisotropic sources. As the source expanding velocity decreases, the BBC function decreases when the particle momentum is approximately perpendicular to the source velocity, and the BBC function increases when the particle momentum is approximately parallel to the source velocity.

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29

Caban, Paweł, and Jakub Rembieliński. "Relativistic Einstein-Podolsky-Rosen Correlations." Open Systems & Information Dynamics 18, no. 02 (June 2011): 165–73. http://dx.doi.org/10.1142/s123016121100011x.

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We analyse the correlation function in Einstein-Podolsky-Rosen experiment with relativistic massive particles. We show that in the wide range of parameters the correlation function has local extrema as a function of momentum of the EPR particles.

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30

Weigold, Erich. "(e,2e) Studies of Atoms ? Some Recent Developments." Australian Journal of Physics 43, no. 5 (1990): 543. http://dx.doi.org/10.1071/ph900543.

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Some recent work on (e,2e) collisions in atoms is reported. The first (e,2e) results on an excited target and also on an oriented target are discussed. Sodium atoms are pumped to the m/ = +1 state of the excited 3p state by 0"+ light from a laser. The (e,2e) measurements are then performed on this excited state. The results are in excellent agreement with the momentum density profile given by the 3p(m/ = 1) Hartree-Fock wavefunction. High resolution electron momentum spectroscopy measurements are reported for argon. The first momentum profiles for excited Ar ion states belonging to the 2po and 20e manifolds are obtained. The latter are entirely due to initial state correlations. Comparison is made with several many-body calculations. The importance of core quadrupole (10) excitations is demonstrated. Although the 2se manifold is dominated by final state correlations, the momentum profile to the 4s 2S ion state in the 2Se manifold also shows the influenee of initial state correlation effects. The third series of measurements examines correlations in the autoionising region of helium, encompassing the (2s2)1 S, (2s2p)3p, (2p2)! 0 and (2s2p)! P resonances, at 100, 200 and 400 eV incident electron energies. Measurements, with an energy resolution of 150 meV, were taken at a number of scattered electron angles over an extended range of ejected electron angles, encompassing both the binary and recoil regions. The data show very strong correlations between the resonance amplitudes and the direct ionisation amplitudes.

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31

Białkowska, H., H. Agakishiev, I. Ivanovskaya, R. Mehtiev, V. Boldea, and S. Dita. "Transverse momentum correlations in CC and CTa interactions at momentum 4.2 GeV /c/A." Physics Letters B 173, no. 3 (June 1986): 349–50. http://dx.doi.org/10.1016/0370-2693(86)90531-9.

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32

KUMAR, V., B. SINGH, H. S. PALSANIA, K. B. BHALLA, S. LOKANATHAN, S. K. BADYAL, N. K. RAO, and P. BHARTI. "ON THE COMPRESSION AND MULTIFRAGMENTATION OF NUCLEAR MATTER AT HIGH ENERGIES." International Journal of Modern Physics E 05, no. 01 (March 1996): 217–26. http://dx.doi.org/10.1142/s0218301396000104.

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Two-particle correlations and momentum widths have been studied in case of Kr+Ag(Br) and La+Ag(Br) reactions in order to search for a physical quantity which corresponds to nuclear compression. Both the two particle correlation coefficient, B, and momentum width of alphas increase with the incident energy. Hence, they may be used to quantify nuclear compression or the nuclear density in high energy nuclear collisions.

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33

McCarthy, Ian E. "The Development of Electron Momentum Spectroscopy." Australian Journal of Physics 51, no. 4 (1998): 593. http://dx.doi.org/10.1071/p97081.

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Electron momentum spectroscopy measures relative differential cross sections as a function of recoil momentum for energy-resolved states of the ion in a kinematically-complete electron- impact ionisation experiment. The experiment is done in a kinematic range where correct cross sections are obtained by simple reaction approximations. It amounts to a measurement of orbital momentum densities and coeffcients describing electron correlations in the ion for most ion states of a gas target. Certain ion states give information about ground-state correlations. For a solid target it amounts to a measurement of the energy-momentum density of occupied electron bands.

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34

Achatz, Lukas, Evelyn A. Ortega, Krishna Dovzhik, Rodrigo F. Shiozaki, Jorge Fuenzalida, Sören Wengerowsky, Martin Bohmann, and Rupert Ursin. "Certifying position-momentum entanglement at telecommunication wavelengths." Physica Scripta 97, no. 1 (January 1, 2022): 015101. http://dx.doi.org/10.1088/1402-4896/ac44b5.

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Abstract The successful employment of high-dimensional quantum correlations and its integration in telecommunication infrastructures is vital in cutting-edge quantum technologies for increasing robustness and key generation rate. Position-momentum Einstein-Podolsky-Rosen (EPR) entanglement of photon pairs are a promising resource of such high-dimensional quantum correlations. Here, we experimentally certify EPR correlations of photon pairs generated by spontaneous parametric down-conversion (SPDC) in a nonlinear crystal with type-0 phase-matching at telecommunication wavelength for the first time. To experimentally observe EPR entanglement, we perform scanning measurements in the near- and far-field planes of the signal and idler modes. We certify EPR correlations with high statistical significance of up to 45 standard deviations. Furthermore, we determine the entanglement of formation of our source to be greater than one, indicating a dimensionality of greater than 2. Operating at telecommunication wavelengths around 1550 nm, our source is compatible with today’s deployed telecommunication infrastructure, thus paving the way for integrating sources of high-dimensional entanglement into quantum-communication infrastructures.

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35

PAPAKONSTANTINOU, P., E. MAVROMMATIS, and T. S. KOSMAS. "ON THE TWO-BODY MOMENTUM DISTRIBUTION IN FINITE NUCLEI." International Journal of Modern Physics B 17, no. 28 (November 10, 2003): 5197–201. http://dx.doi.org/10.1142/s0217979203020326.

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We present compact analytic expressions for the two-body momentum distribution η2(p1, p2) in Z=N closed-shell nuclei derived within the context of the independent particle shell model. Results are derived for the nucleus 16 O . The effect of dynamical short-range correlations is estimated using Jastrow-type correlation functions in the case of the nucleus 4 He .

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36

Hambrock, R., and W. A. Horowitz. "Heavy flavour energy loss from AdS/CFT: A novel diffusion coefficient." EPJ Web of Conferences 171 (2018): 18002. http://dx.doi.org/10.1051/epjconf/201817118002.

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Анотація:

Two AdS/CFT based energy loss models are used to compute the suppression and azimuthal correlations of heavy quarks in heavy ion collisions. The model with a velocity independent diffusion coefficient is in good agreement with B and D meson data up to high pT. The partonic azimuthal correlations we calculate exhibit an order of magnitude difference in low momentum correlations to pQCD calculations [1]. We thus propose heavy flavour momentum correlations as a distinguishing observable of weaklyand strongly-coupled energy loss mechanisms.

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37

Egido, J. Luis, and Marta Borrajo. "Pairing correlations and symmetries in odd-A nuclei." EPJ Web of Conferences 178 (2018): 02002. http://dx.doi.org/10.1051/epjconf/201817802002.

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Анотація:

The pairing correlations in odd-A nuclei are analyzed in the mean field approximation and beyond. In particular the role of symmetry conservation is investigated. We find that particle number projection after the variation (PN-PAV) has little effect on the pairing correlations specially in the weak pairing regime. This is in contrast to the variation after particle number projection (PN-VAP) approach where a strong effect is found. The situation is specially critical in odd nuclei because the pairing correlations vanish due to the blocking effect and the Hartree-Fock-Bogoliubov wave function collapses to the Hartree-Fock one. The PN-VAP, however, handles perfectly the exact blocking providing highly correlated wave functions. The role of the angular momentum projection is studied only in the PAV approach. We find small changes of the pairing correlation, at least at small angular momentum. In the calculations we use the Gogny interaction well suited to this kind of studies.

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38

Casal, Jesús, Mario Gómez-Ramos, and Antonio M. Moro. "Dineutron correlations in knockout reactions with Borromean halo nuclei." EPJ Web of Conferences 290 (2023): 09006. http://dx.doi.org/10.1051/epjconf/202329009006.

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Анотація:

We study dineutron correlations in proton-target knockout reactions induced by Borromean two-neutron halo nuclei. Using a core + n + n three-body model for the projectile and a quasifree sudden reaction framework, we focus on the correlation angle as a function of the intrinsic neutron momentum. Our results indicate that the correlations are strong in a range of neutron momenta associated to the nuclear surface. We also discuss on the role of core excitations for such correlations.

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39

Neto, J. S. M., L. A. Cabral, and I. G. da Paz. "Position–momentum correlations in matter waves double-slit experiment." European Journal of Physics 36, no. 3 (February 19, 2015): 035002. http://dx.doi.org/10.1088/0143-0807/36/3/035002.

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40

Leach, J., B. Jack, J. Romero, A. K. Jha, A. M. Yao, S. Franke-Arnold, D. G. Ireland, R. W. Boyd, S. M. Barnett, and M. J. Padgett. "Quantum Correlations in Optical Angle-Orbital Angular Momentum Variables." Science 329, no. 5992 (August 5, 2010): 662–65. http://dx.doi.org/10.1126/science.1190523.

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41

Sagar, Robin P., Humberto G. Laguna, and Nicolais L. Guevara. "Conditional entropies and position–momentum correlations in atomic systems." Molecular Physics 107, no. 19 (October 10, 2009): 2071–80. http://dx.doi.org/10.1080/00268970903153675.

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42

Pokharel, Rajendra, Sean Gavin, and George Moschelli. "Rapidity Dependence of Transverse Momentum Correlations from Fluctuating Hydrodynamics." Journal of Physics: Conference Series 458 (August 23, 2013): 012005. http://dx.doi.org/10.1088/1742-6596/458/1/012005.

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43

Barate, R., D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, et al. "Analysis of transverse momentum correlations in hadronic Z decays." Physics Letters B 447, no. 1-2 (February 1999): 183–98. http://dx.doi.org/10.1016/s0370-2693(98)01572-x.

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44

Nason, Paolo, and Carlo Oleari. "Next-to-leading-order corrections to momentum correlations in." Physics Letters B 407, no. 1 (August 1997): 57–60. http://dx.doi.org/10.1016/s0370-2693(97)00721-1.

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45

Sharma, Monika. "Estimation of shear viscosity based on transverse momentum correlations." Nuclear Physics A 830, no. 1-4 (November 2009): 813c—816c. http://dx.doi.org/10.1016/j.nuclphysa.2009.10.074.

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46

Amir-Azimi-Nili, K., H. Müther, L. D. Skouras, and A. Polls. "Long-range correlations and the momentum distribution in nuclei." Nuclear Physics A 604, no. 3 (July 1996): 245–62. http://dx.doi.org/10.1016/0375-9474(96)00142-x.

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47

MONDAL, MRIGANKA MOULI. "KT MEASUREMENT OF PARTONS FROM DI-HADRON CORRELATION AND A COMPARATIVE STUDY WITH JET RECONSTRUCTION METHOD USING PYTHIA." International Journal of Modern Physics E 20, no. 07 (July 2011): 1656–61. http://dx.doi.org/10.1142/s0218301311020046.

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Анотація:

The hard scattering processes appear as back to back jets in pp collisions. The effective transverse momentum of the two hard scattered partons (kt) arises due to the intrinsic transverse momentum of the partons and its broadening. Azimuthal correlations of the neutral clusters (mostly from π0) with transverse energy Et=6.5-18.5 GeV as trigger particles and the charged tracks as associated particles have been measured by the STAR experiment in pp and dAu collisions at [Formula: see text]. Using the di-hadron correlation technique the effect of the cold nuclear matter on [Formula: see text] is discussed. A simulation study from PYTHIA using simple di-jet like clustering is also discussed in context of results of [Formula: see text] from di-hadron correlations and di-jets.

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48

MÜTHER, H., S. ULRYCH, and H. TOKI. "CORRELATIONS AND THE RELATIVISTIC STRUCTURE OF THE NUCLEON SELF-ENERGY." International Journal of Modern Physics E 08, no. 02 (April 1999): 179–96. http://dx.doi.org/10.1142/s0218301399000148.

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A key point of Dirac-Brueckner-Hartree-Fock calculations for nuclear matter is to decompose the self-energy of the nucleons into Lorentz scalar and vector components. A new method is introduced for this decomposition. It is based on the dependence of the single-particle energy on the small components in the Dirac spinors used to calculate the matrix elements of the underlying NN interaction. The resulting Dirac components of the self-energy depend on the momentum of the nucleons. At densities around and below the nuclear matter saturation density this momentum dependence is dominated by the non-locality of the Brueckner G matrix. At higher densities these correlation effects are suppressed and the momentum dependence due to the Fock exchange terms is getting more important. Differences between symmetric nuclear matter and neutron matter are discussed. Various versions of the Bonn potential are considered.

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49

Natarajan, Priyamvada, Robert G. Crittenden, Ue-Li Pen, and Tom Theuns. "Do Angular Momentum Induced Ellipticity Correlations Contaminate Weak Lensing Measurements?" Publications of the Astronomical Society of Australia 18, no. 2 (2001): 198–200. http://dx.doi.org/10.1071/as01018.

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AbstractAlignments in the angular momentum vectors of galaxies can induce large scale correlations in their projected orientations. Such alignments arise from the tidal torques exerted on neighboring protogalaxies by the smoothly varying shear field. Weak gravitational lensing can also induce ellipticity correlations since the images of neighboring galaxies will be distorted coherently by the intervening mass distribution. Comparing these two sources of shape correlations, it is found that for current weak lensing surveys with a median redshift of zm = 1, the intrinsic signal is a contaminant on the order of 1–10% of the measured signal. However, for shallower surveys with zm ≤ 0.3, the intrinsic correlations dominate over the lensing signal. The distortions induced by lensing are curl-free, whereas those resulting from intrinsic alignments are not. This difference can be used to disentangle these two sources of ellipticity correlations. When the distortions are dominated by lensing, as occurs at high redshifts, the decomposition provides a valuable tool for understanding properties of the noise and systematic errors.

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50

Gautam, S., and R. Kant. "Effect of Momentum Correlations on the Properties of Fragments Produced in Heavy-Ion Collisions." Ukrainian Journal of Physics 57, no. 6 (June 30, 2012): 599. http://dx.doi.org/10.15407/ujpe57.6.599.

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We study the effect of momentum correlations on the properties of light and medium mass fragments by imposing the momentum cut in clustering the phase space. The rapidity distributions, dN/ptdpt spectra, and ratio of transverse to longitudinal energy (Erat) for the reactions of 12C+12C and 40Ca+40Ca are analyzed. We have found a significant influence of the momentum cut on these properties of the fragments. The results of our calculations are compared with experimental data.

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