Charge-odd directed flows in heavy-ion collisions by Boltzmann-Maxwell equations [article]

Jun-Jie Zhang, Xin-Li Sheng, Shi Pu, Jian-Nan Chen, Guo-Liang Peng, Jian-Guo Wang, Qun Wang
<span title="2022-01-17">2022</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We have calculated the directed flow v_1 and charge-odd directed flow Δ v_1 for pions and protons in Au+Au collisions at √(s_NN)=200GeV by solving the coupled Boltzmann-Maxwell equations self-consistently. Our numerical results show that v_1 for pions and protons are all negative and have similar behavior and magnitude. In contrast we find a quite different behavior in Δ v_1 for pions and protons. The difference lies in that Δ v_1 for protons mainly comes from pressure gradients of the medium,
more &raquo; ... hile the dominant contribution to Δ v_1 for pions is from electromagnetic fields. Our results indicate that the effect of the electric field will slightly exceed that of the magnetic and lead to a small negative slope of Δ v_1 for pions. Our numerical results are consistent with experimental data and solve the sign puzzle in Δ v_1 for pions and protons in previous studies.
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