Centrality Dependences of Characteristics of Negative Pions in π− +12C Interactions at 40 GeV/c
The collision centrality dependences of the mean multiplicities and kinematical characteristics of negative pions produced in п−+12C collisions at 40 GeV/с are investigated. It is obtained that the average values of the partial inelasticity coefficients of negative pions (without “leading” pions) do not depend on the п−+12C collision centrality. It is shown that the normalized transverse momentum distributions, as well as the average values of the transverse momentum of negative pions, do not depend within the uncertainties on the п−+12C collision centrality. The average value of the emission angle of the negative pions was found to increase with the п−+12C collision centrality. The comparison of the normalized emission angle distributions of the negative pions in the peripheral and central п−+12C collisions at 40 GeV/с supported the assumption that such an increase in the average emission angle is likely due to an increase in the number of binary collisions and multiple rescatterings with the п−+12C collision centrality. The obtained experimental findings are reproduced qualitatively well by the Modified FRITIOF model calculations.
P. Braun-Munzinger, J. Stachel. Pion production in medium energy heavy ion reactions. Ann. Rev. Nucl. Part. Sci. 37, 97 (1987). https://doi.org/10.1146/annurev.ns.37.120187.000525
L. Ahle et al. Particle production at high baryon density in central Au + Au reactions at 11.6 A GeV/c. Phys. Rev. C 57, 466 (1998). https://doi.org/10.1103/PhysRevC.57.R466
D. Krpic, G. Skoro, I. Picuric, S. Backovic, S. Drndarevic. Baryon resonances in carbon–carbon collisions at 4.2 GeV/c per nucleon. Phys. Rev. C 65, 034909 (2002). https://doi.org/10.1103/PhysRevC.65.034909
Bao-An Li, Che Ming Ko. Formation of superdense hadronic matter in high energy heavy-ion collisions. Phys. Rev. C 52, 2037 (1995). https://doi.org/10.1103/PhysRevC.52.2037
W. Ehehalt, W. Cassing, A. Engel, U. Mosel, Gy. Wolf. Effects of pion- and Delta-self-energies in nucleus-nucleus reactions. Phys. Lett. B 298, 31 (1993). https://doi.org/10.1016/0370-2693(93)91701-N
Kh.K. Olimov et al. Production of pions and resonances in collisions of 4He nuclei with carbon nuclei at 4.2 GeV/c per nucleon. Phys. Rev. C 75, 067901 (2007). https://doi.org/10.1103/PhysRevC.75.067901
Kh.K. Olimov, Mahnaz Q. Haseeb, I. Khan, A.K. Olimov, V.V. Glagolev. ?0(1232) production in d+12C collisions at 4.2 A GeV/c. Phys. Rev. C 85, 014907 (2012). https://doi.org/10.1103/PhysRevC.85.014907
Kh.K. Olimov, Mahnaz Q. Haseeb. Production of ?0(1232)-resonances in p+12C collisions at a momentum of 4.2 GeV/c. Eur. Phys. J. A 47, 79 (2011). https://doi.org/10.1140/epja/i2011-11079-2
P.K. Netrakanti, B. Mohanty. The width of rapidity distribution in heavy ion collisions. Phys. Rev. C 71, 047901 (2005). https://doi.org/10.1103/PhysRevC.71.047901
L. Chkhaidze, T. Djobava, L. Kharkhelauri. Temperatures of ? hyperons, K0 and п? mesons produced in C–C and Mg–Mg collisions at 4.2–4.3 A GeV/c. Bull. Georg. Natl. Acad. Sci. 4, 41 (2010).
L. Chkhaidze et al. Anisotropic collective flow of ?-hyperons produced in C+C collisions at 4.2 A GeV/c. Nucl. Phys. A 831, 22 (2009). https://doi.org/10.1016/j.nuclphysa.2009.08.008
Akhtar Iqbal, Kh.K. Olimov, Imran Khan et al. On centrality and rapidity dependences of transverse momentum spectra of negative pions in 12C+12C collisions at 4.2 GeV/c per nucleon. Intern. J. Mod. Phys. E 23, 1450047 (2014). https://doi.org/10.1142/S0218301314500475
Kh.K. Olimov, Sayyed A. Hadi, Mahnaz Q. Haseeb. Centrality dependence of rapidity spectra of negative pions in 12C+12C and 12C+181Ta collisions at 4.2 GeV/c per nucleon. Phys. Atom. Nucl. 77, 613 (2014). https://doi.org/10.1134/S1063778814050159
Kh.K. Olimov, A. Iqbal, SL. Lutpullaev, S.A. Hadi, V.V. Glagolev, B.S. Yuldashev, M.Q. Haseeb. Centrality dependences of soft and hard components of pt distributions of negative pions in 4He+12C collisions at 4.2 A GeV/c. Int. J. Modern Phys. E 24, 1550036 (2015). https://doi.org/10.1142/S0218301315500366
N. Angelov et al. Interaction cross sections and negative pion multiplicities in nucleus-nucleus collisions at 4.2 GeV/c. Yad. Fiz. 30, 1590 (1979).
S. Backovic et al. Temperature of negative pions in inelastic (d, a, C) + (C, Ta) collisions at 4.2 A GeV/c. Phys. Rev. C 46, 1501 (1992). https://doi.org/10.1103/PhysRevC.46.1501
A.I. Bondarenko et al. The ensemble of interactions on carbon and hydrogen nuclei obtained using the 2 m propane bubble chamber exposed to the beams of protons and H-2, He-4, C-12 relativistic nuclei at the Dubna Synchrophasotron. JINR Preprint No. P1-98-292 (Dubna, 1998).
B. Gankhuyag, V.V. Uzhinskii. Modified FRITIOF code: Negative charged particle production in high-energy nucleus-nucleus interactions. JINR Preprint No. P2-96-419 (Dubna, 1996).
A.S. Galoyan, G.L. Melkumov, V.V. Uzhinskii. Analysis of charged-particle production in nucleus-nucleus interactions near and beyond the kinematical limit for free NN collisions within the FRITIOF model. Phys. Atom. Nucl. 65, 1722 (2002). https://doi.org/10.1134/1.1508702
A.I. Bondarenko et al. Features of CC interactions at a momentum of 4.2 GeV/c per nucleon for various degrees of nuclear-collision centrality. Phys. Atom. Nucl. 65, 90 (2002). https://doi.org/10.1134/1.1446560
A.S. Galoyan et al. Features of pC interactions at a momentum of 4.2 GeV/c versus the degree of centrality of collisions between protons and carbon nuclei: Multiplicity of secondary particles. Phys. Atom. Nucl. 66, 836 (2003). https://doi.org/10.1134/1.1576457