Chiral symmetry restoration versus deconfinement in heavy-ion collisions at high baryon density

被引：60

作者：

Cassing, W. ^{[1
]}

Palmese, A. ^{[1
]}

Moreau, P. ^{[2
,3
]}

Bratkovskaya, E. L. ^{[2
,3
]}

机构：

[1] Univ Giessen, Inst Theoret Phys, Giessen, Germany

[2] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, D-60054 Frankfurt, Germany

[3] Goethe Univ Frankfurt, Inst Theoret Phys, Frankfurt, Germany

来源：

PHYSICAL REVIEW C | 2016年 / 93卷 / 01期

关键词：

STRANGENESS PRODUCTION; QUARK CONDENSATE; NUCLEAR-MATTER; MODEL; QCD; HOT; SIS; TEMPERATURE; ENERGIES; DYNAMICS;

D O I：

10.1103/PhysRevC.93.014902

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：

We study the production of strange hadrons in nucleus-nucleus collisions from 4 to 160 A GeV within the parton-hadron-string dynamics (PHSD) transport approach that is extended to incorporate essentials aspects of chiral symmetry restoration (CSR) in the hadronic sector (via the Schwinger mechanism) on top of the deconfinement phase transition as implemented in PHSD. Especially the K+/ pi p(+) and the (Lambda + Sigma 0)/ pi(-) ratios in central Au+Au collisions are found to provide information on the relative importance of both transitions. The modeling of chiral symmetry restoration is driven by the pion-nucleon Sigma term in the computation of the quark scalar condensate (q) over barq > that serves as an order parameter for CSR and also scales approximately with the effective quark masses m(s) and m(q). Furthermore, the nucleon scalar density rho(s), which also enters the computation of (q) over barq >, is evaluated within the nonlinear sigma -omega model which is constrained by Dirac-Brueckner calculations and low-energy heavy-ion reactions. The Schwinger mechanism (for string decay) fixes the ratio of strange to light quark production in the hadronic medium. We find that above similar to 80 A GeV the reaction dynamics of heavy nuclei is dominantly driven by partonic degrees of freedom such that traces of the chiral symmetry restoration are hard to identify. Our studies support the conjecture of "quarkyonic matter" in heavy-ion collisions from about 5 to 40 A GeV and provide a microscopic explanation for the maximum in the K+/ pi(+) ratio at about 30 A GeV, which only shows up if a transition to partonic degrees of freedom is incorporated in the reaction dynamics and is discarded in the traditional hadron-string models.

引用

页数：12

共 97 条

[1] Identified particle production, azimuthal anisotropy, and interferometry measurements in Au plus Au collisions at √sNN=9.2 GeV [J].

Abelev, B. I. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Alakhverdyants, A. V. ;

Anderson, B. D. ;

Arkhipkin, D. ;

Averichev, G. S. ;

Balewski, J. ;

Barannikova, O. ;

Barnby, L. S. ;

Baumgart, S. ;

Beavis, D. R. ;

Bellwied, R. ;

Benedosso, F. ;

Betancourt, M. J. ;

Betts, R. R. ;

Bhasin, A. ;

Bhati, A. K. ;

Bichsel, H. ;

Bielcik, J. ;

Bielcikova, J. ;

Biritz, B. ;

Bland, L. C. ;

Bnzarov, I. ;

Bonner, B. E. ;

Bouchet, J. ;

Braidot, E. ;

Brandin, A. V. ;

Bridgeman, A. ;

Bruna, E. ;

Bueltmann, S. ;

Burton, T. P. ;

Cai, X. Z. ;

Caines, H. ;

Sanchez, M. Calderon de la Barca ;

Catu, O. ;

Cebra, D. ;

Cendejas, R. ;

Cervantes, M. C. ;

Chajecki, Z. ;

Chaloupka, P. ;

Chattopadhyay, S. ;

Chen, H. F. ;

Chen, J. H. ;

Chen, J. Y. ;

Cheng, J. ;

Cherney, M. ;

Chikanian, A. ;

Choi, K. E. ;

Christie, W. .

PHYSICAL REVIEW C, 2010, 81 (02)

[2] Energy dependence of pion and kaon production in central Pb plus Pb collisions -: art. no. 054902 [J].

Afanasiev, SV ;

Anticic, T ;

Barna, D ;

Bartke, J ;

Barton, RA ;

Behler, M ;

Betev, L ;

Bialkowska, H ;

Billmeier, A ;

Blume, C ;

Blyth, CO ;

Boimska, B ;

Botje, M ;

Bracinik, J ;

Bramm, R ;

Brun, R ;

Buncic, P ;

Cerny, V ;

Cramer, JG ;

Csató, P ;

Dinkelaker, P ;

Eckhardt, V ;

Filip, P ;

Fodor, Z ;

Foka, P ;

Freund, P ;

Friese, V ;

Gál, J ;

Gazdzicki, M ;

Georgopoulos, G ;

Gladysz, E ;

Hegyi, S ;

Höhne, C ;

Igo, G ;

Jones, PG ;

Kadija, K ;

Karev, A ;

Kolesnikov, VI ;

Kollegger, T ;

Kowalski, M ;

Kraus, I ;

Kreps, M ;

van Leeuwen, M ;

Lévai, P ;

Malakhov, AI ;

Margetis, S ;

Markert, C ;

Mayes, BW ;

Melkumov, GL ;

Mischke, A .

PHYSICAL REVIEW C, 2002, 66 (05)

[3] Chiral representation of the πN scattering amplitude and the pion-nucleon sigma term [J].

Alarcon, J. M. ;

Camalich, J. Martin ;

Oller, J. A. .

PHYSICAL REVIEW D, 2012, 85 (05)

[4] Λ spectra in 11.6A GeV/c Au-Au collisions -: art. no. 062301 [J].

Albergo, S ;

Bellwied, R ;

Bennett, M ;

Boemi, D ;

Bonner, B ;

Caines, H ;

Christie, W ;

Costa, S ;

Crawford, HJ ;

Cronqvist, M ;

Debbe, R ;

Engelage, J ;

Flores, I ;

Greiner, L ;

Hallman, T ;

Hijazi, G ;

Hoffmann, G ;

Huang, HZ ;

Humanic, TJ ;

Insolia, A ;

Jensen, P ;

Judd, EG ;

Kainz, K ;

Kaplan, M ;

Kelly, S ;

Kotov, I ;

Kunde, G ;

Lindstrom, PJ ;

Ljubicic, T ;

Llope, W ;

LoCurto, G ;

Longacre, R ;

Lynn, D ;

Madansky, L ;

Mahzeh, N ;

Milosevich, Z ;

Mitchell, JM ;

Mitchell, JW ;

Nehmeh, S ;

Nociforo, C ;

Paganis, S ;

Pandey, SU ;

Potenza, R ;

Russ, DE ;

Saulys, A ;

Schambach, J ;

Sheen, J ;

Sugarbaker, E ;

Takahashi, J ;

Tang, J .

PHYSICAL REVIEW LETTERS, 2002, 88 (06) :1-062301

[5] Pion and kaon production in central Pb plus Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement [J].

Alt, C. ;

Anticic, T. ;

Baatar, B. ;

Barna, D. ;

Bartke, J. ;

Betev, L. ;

Bialkowska, H. ;

Blume, C. ;

Boimska, B. ;

Botje, M. ;

Bracinik, J. ;

Bramm, R. ;

Buncic, P. ;

Cerny, V. ;

Christakoglou, P. ;

Chung, P. ;

Chvala, O. ;

Cramer, J. G. ;

Csato, P. ;

Dinkelaker, P. ;

Eckardt, V. ;

Flierl, D. ;

Fodor, Z. ;

Foka, P. ;

Friese, V. ;

Gal, J. ;

Gazdzicki, M. G. ;

Genchev, V. ;

Gladysz, E. ;

Grebieszkow, K. ;

Hegyi, S. ;

Hoehne, C. ;

Kadija, K. ;

Karev, A. ;

Kikola, D. ;

Kliemant, M. ;

Kniege, S. ;

Kolesnikov, V. I. ;

Kollegger, T. ;

Kornas, E. ;

Kowalski, M. ;

Kraus, I. ;

Kreps, M. ;

Laszlo, A. ;

Lacey, R. ;

van Leeuwen, M. ;

Levai, P. ;

Litov, L. ;

Lungwitz, B. ;

Makariev, M. .

PHYSICAL REVIEW C, 2008, 77 (02)

[6] THE FRITIOF MODEL FOR VERY-HIGH-ENERGY HADRONIC COLLISIONS [J].

ANDERSSON, B ;

GUSTAFSON, G ;

HONG, P .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1993, 57 (03) :485-494

[7] Hadron production in ultra-relativistic nuclear collisions: Quarkyonic matter and a triple point in the phase diagram of QCD [J].

Andronic, A. ;

Blaschke, D. ;

Braun-Munzinger, P. ;

Cleymans, J. ;

Fukushima, K. ;

McLerran, L. D. ;

Oeschler, H. ;

Pisarski, R. D. ;

Redlich, K. ;

Sasaki, C. ;

Satz, H. ;

Stachel, J. .

NUCLEAR PHYSICS A, 2010, 837 (1-2) :65-86

[8] Thermal hadron production in relativistic nuclear collisions: The hadron mass spectrum, the horn, and the QCD phase transition [J].

Andronic, A. ;

Braun-Munzinger, P. ;

Stachel, J. .

PHYSICS LETTERS B, 2009, 673 (02) :142-145

[9]

[Anonymous], ARXIV151109089HEPLAT

[10]

[Anonymous], 1983, Report CERN-HERA-83-02

← 1 2 3 4 5 6 7 8 9 10 →