Study of azimuthal correlations in the target fragmentation region in p, d, He, C plus C, Ta and C plus Ne, Cu collisions at momenta of 4.2, 4.5 and 10 A GeV/c

被引：0

作者：

Chkhaidze, L. ^{[1
]}

Chlachidze, G. ^{[2
]}

Djobava, T. ^{[1
]}

Galoyan, A. ^{[3
]}

Kharkhelauri, L. ^{[1
]}

Togoo, R. ^{[4
]}

Uzhinsky, V. ^{[5
]}

机构：

[1] I Javakhishvili Tbilisi State Univ, High Energy Phys Inst, Tbilisi, Georgia

[2] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[3] Joint Inst Nucl Res, Veksler & Baldin Lab High Energy Phys, Dubna, Russia

[4] Mongolian Acad Sci, Inst Phys & Technol, Ulaanbaatar, Mongolia

[5] Joint Inst Nucl Res, Lab Informat Technol, Dubna, Russia

来源：

EUROPEAN PHYSICAL JOURNAL A | 2019年 / 55卷 / 01期

基金：

美国国家科学基金会;

关键词：

HEAVY-ION COLLISIONS; ELLIPTIC FLOW; COLLECTIVE FLOW; NEGATIVE PIONS; ENERGY; DYNAMICS; PROTONS; PARTICLES; MATTER;

D O I：

10.1140/epja/i2019-12674-9

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

.Azimuthal correlations between the same type of particles (protons or pions) in the target fragmentation region was studied in d, He, C+C, Ta (4.2A GeV/c, C+Ne, Cu (4.5A GeV/c) and p+C, Ta (10 GeV/c) interactions. The data were obtained from the SKM-200-GIBS streamer chamber and from the Propane Bubble Chamber (PBL-500) systems utilized at JINR. Study of multiparticle azimuthal correlations offers unique information about space-time evolution of the interactions. Azimuthal correlations were investigated by using correlation function C(phi)=dN/d(phi) , where phi represents the angle between the sums of transverse momenta vectors for particles emitted in the forward and backward hemispheres. For protons back-to-back (negative) azimuthal correlations were observed in the above-mentioned interactions. The absolute values of the correlation coefficient || --the slope parameter of C(phi), strongly depend on the mass number of the target (AT) nuclei in the nucleon-nucleus and nucleus-nucleus collisions. Namely, || decreases with increase of AT in p+C and p+Ta collisions, while || initially decreases from d+C to C+Ne and then almost does not change with increase of AP, AT in (d+He)Ta, C+Cu and C+Ta collisions. For pions back-to-back correlations were obtained for light targets (C, Ne), and side-by-side (positive) correlations for heavy targets (Cu, Ta). The || insignificantly changes with increase of the momenta per nucleon and almost does not change with increase of AP and AT. Models used for description of the data, the Ultra relativistic Quantum Molecular Dynamic (UrQMD) and Quark-Gluon String Model (QGSM), satisfactorily describe the obtained experimental results.

引用

页数：7

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