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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:31 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Nuclear and Elementary Particles Physics I
Title:
Photon production in nucleus-nucleus collisions at very high energies, predicted by the simulation code “Chaos Many-Body Engine” in Cu-Cu and Au-Au reactions at 200 AGeV
Authors:
I.V. GROSSU(1), C. BESLIU(1), Al. JIPA(1), D. FELEA(2), E. STAN(2), T. ESANU(1,3)
Affiliation:
1) University of Bucharest, Faculty of Physics, Bucharest-Magurele, P.O. Box MG 11, 077125, Romania
2) Institute of Space Science, Laboratory of High Energy, Astrophysics and Advanced Technologies, Bucharest-Magurele, P.O. Box MG 23, 077125, Romania
3) “Horia Hulubei” National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest,Magurele, Romania
E-mail
ioan.grossu@brahms.fizica.unibuc.ro
Keywords:
chaos, high-energy, relativistic nuclear collision, simulation
Abstract:
Using the simulation code “Chaos Many-Body Engine” (CMBE) [1], conceived for nuclear reactions at high energies, a procedure for massless particle production was introduced in the “Many-Body”, “High Precision”, and “Reactions” modules [2]. In this way, gamma photons could be associated with hadron production, thus improving the model. We discuss a CMBE–HIJING comparative study on nuclear collisions at the maximum BNL energy. A number of gamma and hadron distributions are presented, associated to inclusive Cu-Cu and Au-Au reactions at 200 AGeV. The differences between CMBE [2] and HIJING [3,4] can be explained by both, dissimilarities in the reaction lists, and by the fact that HIJING takes into account the mini jet production, with increasing weight for high-energy hadron and nuclear interactions. In relativistic heavy-ion collisions, mini jets are responsible for the main transverse energy production in the central rapidity region. This generates, at least in part, the differences between HIJING and CMBE, mainly observed at mid-rapidity. Furthermore, HIJING also incorporates nuclear effects such as final state interactions and parton shadowing for heavy-ion interactions.
References:
[1] I.V. Grossu, D. Felea, Al. Jipa, C. Besliu, E. Stan et. al., Comput. Phys. Commun. 185,Issue 11, 3059–3061 (2014).
[2] I.V. Grossu, C. Besliu, Al. Jipa, D. Felea, E. Stan, and T. Esanu, Comput. Phys. Commun.,http://dx.doi.org/10.1016/j.cpc.2015.04.027, (2015).
[3] Xin-Nian Wang and Miklos Gyulassy, Phys. Rev. D 44, 3501 (1991).
[4] Miklos Gyulassy and Xin-Nian Wang, Comput. Phys. Commun. 83, 307 (1994).
Acknowledgement:
This study is supported by a grant of the Romanian National Authority for Scientific Research, CNCS – UEFISCDI, project number 34/05.10.2011 PN-II-ID-PCE.
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