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Title: Study of Azimuthal Correlations in the Target Fragmentation Region in p, d, He, C+C, Ta and C+Ne, Cu Collisions at a Momentum of 4.2, 4.5 and 10 AGeV/c

Journal Article · · Eur.Phys.J.
 [1];  [2];  [1];  [3];  [1];  [4];  [3]
  1. Tbilisi State U.
  2. Fermilab
  3. Dubna, JINR
  4. Ulan Bator, Inst. Phys. Tech.
+ Show Author Affiliations

Azimuthal correlations between the same type of particles (protons or pions) in the target fragmentation region was studied in d, He, C + C, Ta (4.2 AGeV/c), C + Ne, Cu (4.5AGeV/c) and p + C, Ta (10 GeV/c) interactions. The data were obtained from the SKM-200-GIBS streamer chamber and from 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($$\Delta\phi$$)=dN/d($$\Delta\phi$$), where $$\Delta\phi$$ represents the angle between the sums of transverse momenta vectors for particles emitted in the forward and backward hemispheres. For protons a "back-to back" ("negative") azimuthal correlations were observed in the above mentioned interactions. The absolute values of the correlation coefficient $$|\xi|$$ -- the slope parameter of C($$\Delta\phi$$), strongly depend on the mass number of the target ($$A_T$$) nuclei in the nucleon-nucleus and nucleus-nucleus collisions. Namely, $$|\xi|$$ -- decreases with increase of $$A_T$$ in p+C and p+Ta collisions, while $$|\xi|$$ decreases from d+C up to C+Ne and then almost does not change with increase of $$A_P$$, $$A_T$$ in (d+He)Ta, C+Cu and C+Ta collisions. For pions a "back-to-back" correlations were obtained for a light targets (C, Ne), and a "side-by-side" ("positive") correlations for a heavy targets (Cu, Ta). The $$|\xi|$$ insignificantly changes with increase of the momenta per nucleon and almost does not change with increase of $$A_P$$ and $$A_T$$. 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.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1478051
Report Number(s):
arXiv:1808.02661; FERMILAB-PUB-18-497-TD; 1685532
Journal Information:
Eur.Phys.J., Vol. A55, Issue 1
Country of Publication:
United States
Language:
English

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Figures / Tables (5)

Table 1(p. 7)table Table 1
Fig. 1(p. 8)figure Fig. 1
Fig.2(p. 9)figure Fig.2
Fig.3(p. 10)figure Fig.3
Fig.4.(p. 10)figure Fig.4.

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