Does non-monotonic behavior of directed flow signal the onset of deconfinement ?

被引：10

作者：

Nara, Yasushi ^{[1
]}

Ohnishi, Akira ^{[2
]}

机构：

[1] Akita Int Univ, Akita 0101292, Japan

[2] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan

来源：

NUCLEAR PHYSICS A | 2016年 / 956卷

关键词：

relativistic heavy-ion collisions; quark-gluon plasma; transport approach; HEAVY-ION COLLISIONS; ENERGY; DEPENDENCE;

D O I：

10.1016/j.nuclphysa.2016.01.026

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 investigate the effects of nuclear mean-field as well as the formation and decay of nuclear clusters on the directed flow v(1) in high energy nucleus-nucleus collisions from root s(NN) = 7.7 GeV to 27 GeV incident energies within a transport model. Specifically, we use the JAM transport model in which potentials are implemented based on the framework of the relativistic quantum molecular dynamics. Our approach reproduces the rapidity dependence of directed flow data up to root s(NN) approximate to 8 GeV showing the significant importance of mean-field. However, the slopes of dv(1)/dy at mid-rapidity are calculated to be positive at ,root s(NN)= 11.7 and 19.6 GeV, and become negative above 27 GeV. Thus the result from the JAM hadronic transport model with nuclear mean-field approach is incompatible with the data. Therefore within our approach, we conclude that the excitation function of the directed flow cannot be explained by the hadronic degree of freedom alone.

引用

页码：284 / 287

页数：4

共 17 条

[1] Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au plus Au Collisions [J].

Adamczyk, L. ;

Adkins, J. K. ;

Agakishiev, G. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Alekseev, I. ;

Alford, J. ;

Anson, C. D. ;

Aparin, A. ;

Arkhipkin, D. ;

Aschenauer, E. C. ;

Averichev, G. S. ;

Banerjee, A. ;

Beavis, D. R. ;

Bellwied, R. ;

Bhasin, A. ;

Bhati, A. K. ;

Bhattarai, P. ;

Bichsel, H. ;

Bielcik, J. ;

Bielcikova, J. ;

Bland, L. C. ;

Bordyuzhin, I. G. ;

Borowski, W. ;

Bouchet, J. ;

Brandin, A. V. ;

Brovko, S. G. ;

Bueltmann, S. ;

Bunzarov, I. ;

Burton, T. P. ;

Butterworth, J. ;

Caines, H. ;

Sanchez, M. Calderon de la Barca ;

Cebra, D. ;

Cendejas, R. ;

Cervantes, M. C. ;

Chaloupka, P. ;

Chang, Z. ;

Chattopadhyay, S. ;

Chen, H. F. ;

Chen, J. H. ;

Chen, L. ;

Cheng, J. ;

Cherney, M. ;

Chikanian, A. ;

Christie, W. ;

Chwastowski, J. ;

Codrington, M. J. M. ;

Contin, G. ;

Cramer, J. G. .

PHYSICAL REVIEW LETTERS, 2014, 112 (16)

[2] Energy and centrality dependence of (p)over-bar and p production and the (Λ)over-bar/(p)over-bar ratio in Pb plus Pb collisions between 20A GeV and 158A GeV -: art. no. 044910 [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 ;

Chvala, O ;

Cramer, JG ;

Csató, P ;

Dinkelaker, P ;

Eckardt, V ;

Flierl, D ;

Fodor, Z ;

Foka, P ;

Friese, V ;

Gál, J ;

Gazdzicki, M ;

Genchev, V ;

Georgopoulos, G ;

Gladysz, E ;

Grebieszkow, K ;

Hegyi, S ;

Höhne, C ;

Kadija, K ;

Karev, A ;

Kliemant, M ;

Kniege, S ;

Kolesnikov, VI ;

Kornas, E ;

Korus, R ;

Kowalski, M ;

Kraus, I ;

Kreps, M ;

Laslo, A ;

van Leeuwen, M ;

Lévai, P ;

Litov, L ;

Lungwitz, B ;

Makariev, M ;

Malakhov, AI ;

Mateev, M .

PHYSICAL REVIEW C, 2006, 73 (04)

[3] Microscopic models for ultrarelativistic heavy ion collisions [J].

Bass, SA ;

Belkacem, M ;

Bleicher, M ;

Brandstetter, M ;

Bravina, L ;

Ernst, C ;

Gerland, L ;

Hofmann, M ;

Hofmann, S ;

Konopka, J ;

Mao, G ;

Neise, L ;

Soff, S ;

Spieles, C ;

Weber, H ;

Winckelmann, LA ;

Stocker, H ;

Greiner, W ;

Hartnack, C ;

Aichelin, J ;

Amelin, N .

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 41, 1998, 41 :255-369

[4] Anisotropic flow in ultra-relativistic heavy-ion collisions [J].

Bleicher, M ;

Stöcker, H .

PHYSICS LETTERS B, 2002, 526 (3-4) :309-314

[5] Antiflow of nucleons at the softest point of the equation of state -: art. no. 024909 [J].

Brachmann, J ;

Soff, S ;

Dumitru, A ;

Stöcker, A ;

Maruhn, JA ;

Greiner, W ;

Bravina, LV ;

Rischke, DH .

PHYSICAL REVIEW C, 2000, 61 (02) :8

[6] Third flow component as QGP signal [J].

Csernai, LP ;

Röhrich, D .

PHYSICS LETTERS B, 1999, 458 (04) :454-459

[7] Mean-field effects on collective flow in high-energy heavy-ion collisions at 2-158A GeV energies [J].

Isse, M ;

Ohnishi, A ;

Otuka, N ;

Sahu, PK ;

Nara, Y .

PHYSICAL REVIEW C, 2005, 72 (06)

[8] Directed flow indicates a cross-over deconfinement transition in relativistic nuclear collisions [J].

Ivanov, Yu. B. ;

Soldatov, A. A. .

PHYSICAL REVIEW C, 2015, 91 (02)

[9] Examination of the directed flow puzzle in heavy-ion collisions [J].

Konchakovski, V. P. ;

Cassing, W. ;

Ivanov, Yu. B. ;

Toneev, V. D. .

PHYSICAL REVIEW C, 2014, 90 (01)

[10]

Li Q., ARXIV150706033

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