Evidence for chiral symmetry restoration in heavy-ion collisions

被引：4

作者：

Moreau, P. ^{[1
,2
,3
]}

Palmese, A. ^{[4
]}

Cassing, W. ^{[4
]}

Seifert, E. ^{[4
]}

Steinert, T. ^{[4
]}

Bratkovskaya, E. L. ^{[1
,2
,3
]}

机构：

[1] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, Frankfurt, Germany

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

[3] GSI Helmholtzzentrum Schwerionenforsch GmbH, Darmstadt, Germany

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

来源：

NUCLEAR PHYSICS A | 2017年 / 967卷

关键词：

Chiral symmetry restoration; relativistic heavy-ion collisions; quark-gluon plasma; string fragmentation; strangeness enhancement; QCD phase diagram; NUCLEUS-NUCLEUS COLLISIONS; STRANGENESS PRODUCTION; ENERGIES;

D O I：

10.1016/j.nuclphysa.2017.05.030

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 effect of the chiral symmetry restoration (CSR) on heavy-ion collisions observables in the energy range root S-NN = 3-20 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach. The PHSD includes the deconfinement phase transition as well as essential aspects of CSR in the dense and hot hadronic medium, which are incorporated in the Schwinger mechanism for particle production. Our systematic studies show that chiral symmetry restoration plays a crucial role in the description of heavy-ion collisions at root S-NN = 3-20 GeV, realizing an increase of the hadronic particle production in the strangeness sector with respect to the non-strange one. Our results provide a microscopic explanation for the horn structure in the excitation function of the K+/pi(+) ratio: the CSR in the hadronic phase produces the steep increase of this particle ratio up to root S-NN approximate to 7 GeV, while the drop at higher energies is associated to the appearance of a deconfined partonic medium. Furthermore, the appearance/disappearance of the horn structure is investigated as a function of the system size. We additionally present an analysis of strangeness production in the (T, mu(B))-plane (as extracted from the PHSD for central Au+Au collisions) and discuss the perspectives to identify a possible critical point in the phase diagram.

引用

页码：836 / 839

页数：4

共 20 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] Strange and multistrange particle production in Au plus Au collisions at √sNN=62.4 GeV [J].

Aggarwal, M. M. ;

Ahammed, Z. ;

Alakhverdyants, A. V. ;

Alekseev, I. ;

Alford, J. ;

Anderson, B. D. ;

Anson, C. D. ;

Arkhipkin, D. ;

Averichev, G. S. ;

Balewski, J. ;

Beavis, D. R. ;

Bellwied, R. ;

Betancourt, M. J. ;

Betts, R. R. ;

Bhasin, A. ;

Bhati, A. K. ;

Bichsel, H. ;

Bielcik, J. ;

Bielcikova, J. ;

Biritz, B. ;

Bland, L. C. ;

Borowski, W. ;

Bouchet, J. ;

Braidot, E. ;

Brandin, A. V. ;

Bridgeman, A. ;

Brovko, S. G. ;

Bruna, E. ;

Bueltmann, S. ;

Bunzarov, I. ;

Burton, T. P. ;

Cai, X. Z. ;

Caines, H. ;

Sanchez, M. Calderon de la Barca ;

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. ;

Chung, P. ;

Codrington, M. J. M. .

PHYSICAL REVIEW C, 2011, 83 (02)

[3] Energy dependence of Λ and Ξ production in central Pb plus Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV measured at the CERN Super Proton Synchrotron [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. ;

Genchev, V. ;

Gladysz, E. ;

Grebieszkow, K. ;

Hegyi, S. ;

Hoehne, C. ;

Kadija, K. ;

Karev, A. ;

Kikola, D. ;

Kliemant, M. ;

Kniege, S. ;

Kolesnikov, V. I. ;

Kornas, E. ;

Kowalski, M. ;

Kraus, I. ;

Kreps, M. ;

Laszlo, A. ;

Lacey, R. ;

van Leeuwen, M. ;

Levai, P. ;

Litov, L. ;

Lungwitz, B. ;

Makariev, M. ;

Malakhov, A. I. .

PHYSICAL REVIEW C, 2008, 78 (03)

[4] 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

[5] Parton-Hadron-String Dynamics at relativistic collider energies [J].

Bratkovskaya, E. L. ;

Cassing, W. ;

Konchakovski, V. P. ;

Linnyk, O. .

NUCLEAR PHYSICS A, 2011, 856 (01) :162-182

[6] Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions -: art. no. 054907 [J].

Bratkovskaya, EL ;

Bleicher, M ;

Reiter, M ;

Soff, S ;

Stöcker, H ;

van Leeuwen, M ;

Bass, SA ;

Cassing, W .

PHYSICAL REVIEW C, 2004, 69 (05) :054907-1

[7] Chiral symmetry restoration versus deconfinement in heavy-ion collisions at high baryon density [J].

Cassing, W. ;

Palmese, A. ;

Moreau, P. ;

Bratkovskaya, E. L. .

PHYSICAL REVIEW C, 2016, 93 (01)

[8] Parton-hadron-string dynamics: An off-shell transport approach for relativistic energies [J].

Cassing, W. ;

Bratkovskaya, E. L. .

NUCLEAR PHYSICS A, 2009, 831 (3-4) :215-242

[9]

Cleymans J., ARXIV160309553V1HEPP

[10] The quark condensate in relativistic nucleus-nucleus collisions [J].

Friman, B ;

Norenberg, W ;

Toneev, VD .

EUROPEAN PHYSICAL JOURNAL A, 1998, 3 (02) :165-170

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