Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy

被引:20
作者
Oliva, Lucia [1 ,2 ]
Moreau, Pierre [2 ,3 ]
Voronyuk, Vadim [4 ,5 ]
Bratkovskaya, Elena [1 ,2 ]
机构
[1] GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany
[2] Goethe Univ Frankfurt, Inst Theoret Phys, Max Von Laue Str 1, D-60438 Frankfurt, Germany
[3] Duke Univ, Dept Phys, Durham, NC 27708 USA
[4] Joint Inst Nucl Res, Joliot Curie 6, Dubna 141980, Moscow Region, Russia
[5] Bogolyubov Inst Theoret Phys, Metrolohichna Str 14-b, UA-03143 Kiev, Ukraine
关键词
P-PB COLLISIONS; ANGULAR-CORRELATIONS; MAGNETIC-FIELD; LONG-RANGE; DYNAMICS; FLOW; TRANSPORT; SIDE;
D O I
10.1103/PhysRevC.101.014917
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 proton-gold collisions at RHIC energy root S-NN= 200 GeV within the Parton-Hadron-String Dynamics (PHSD) off-shell transport approach, investigating the influence of the intense electromagnetic fields generated in these small systems. We show the space-time evolution of the magnetic and electric components, emphasizing the huge values of the latter one, in particular the electric field E-x along the impact parameter direction whose magnitude is comparable to the magnetic field B-y perpendicular to the reaction plane. We find a fair agreement of the charged particle pseudorapidity density of the high-multiplicity events with respect to the experimental result of the PHENIX Collaboration. Focusing on the most central collision, we show rapidity distributions and spectra as well as the flow coefficients v(1) and v(2) and we discuss the impact of the electromagnetic fields on identified particle observables. We compute the directed flow v(1) of pi(+), pi(-), K+, K- for collisions at fixed impact parameter and predict that an electromagnetically induced splitting in the v(1) of positively and negatively charged particles is generated in the Au-going side of p+Au reaction mainly driven by the huge E-x component. We find that this effect is stronger for the strange mesons and increases for increasing impact parameter. Furthermore, we highlight the amount of directed flow generated in the deconfined phase, finding that it constitutes the main contribution in the central rapidity region, especially for kaons. Thus, we support the idea that the directed flow is a promising probe for the electromagnetic fields generated in relativistic nuclear collisions and show that in proton-induced reactions the electric component along the impact parameter axis is the primary origin of a charge-odd v(1) of pions and kaons.
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页数:15
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