Directed flow of charm quarks as a witness of the initial strong magnetic field in ultra-relativistic heavy ion collisions

• DOI: 10.1016/j.physletb.2017.02.046
• Publication Date: 2017-02-24T20:45:42Z
• Authors: Santosh K. Das; S. Plumari; S. Chatterjee; J. Alam; F. Scardina; V. Greco
• Keywords: Charm (quantum number); Strange quark

Ultra-relativistic Heavy-Ion Collision (HIC) generates very strong initial magnetic field ($\vec B$) inducing a vorticity in the reaction plane. The high $\vec{B}$ influences evolution dynamics that is opposed by large Faraday current due to electric generated time varying $\vec{B}$. We show resultant effects entail significantly directed flow ($v_1$) of charm quarks (CQs) compared light combination several favorable conditions for CQs, mainly: (i) unlike formation scale $\tau_f \simeq \, 0.1 \rm fm/c$ comparable when $\vec B$ attains its maximum value and (ii) kinetic relaxation CQs similar QGP lifetime, this helps CQ retain kick picked up from electromagnetic transverse direction. effect also odd under charge exchange allowing distinguish it bulk matter angular momentum conservation; conjointly thanks mass, $M_c >>\Lambda_{QCD}$, there should be no mixing with chiral dynamics. Hence provide crucial independent information on strength produced HIC.