Charge-Dependent Directed Flow in Cu plus Au Collisions at root S-NN=200 GeV

0473756 - ÚJF 2018 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Vértési, Robert … Total 347 authors
Charge-Dependent Directed Flow in Cu plus Au Collisions at root S-NN=200 GeV.
Physical Review Letters. Roč. 118, č. 1 (2017), č. článku 012301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LG15001; GA MŠMT LM2015054
Institutional support: RVO:61389005
Keywords : heavy ions collisions * STAR collaboration * quark gluon plasma
OECD category: Particles and field physics
Impact factor: 8.839, year: 2017

We present the first measurement of charge-dependent directed flow in Cu + Au collisions at root S-NN = 200 GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics model, which suggests that most of the electric charges, i.e., quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1 fm/c.
Permanent Link: http://hdl.handle.net/11104/0270895