Charge-asymmetry dependence of kaon elliptic flow in 27 GeV Au+Au collisions from STAR

Keenan Cabrera

Theory predicts that a chiral magnetic wave (CMW) at finite baryon
density can induce a charge-asymmetry dependence of elliptic flow 
of particles produced in heavy-ion collisions [1]. A CMW signal 
has been previously detected in Au+Au collisions by STAR, where 
the quantity  exhibits a linear dependence on the charge asymmetry
with a positive slope [2]. At lower collision energies, it was 
found that the charge-asymmetry-integrated  whereas [3]. Therefore, 
an observation of the same positive linear dependence of kaon  
difference on charge-asymmetry will be a strong support for the 
presence of the CMW in heavy-ion collisions.

In this work, we present kaon elliptic flow as a function of charge
asymmetry for Au+Au collisions at 27 GeV. In case the STAR data do
not yield enough events at 27 GeV to make a firm conclusion, 
preliminary estimates will be presented for the statistics required
for the phase II of the RHIC Beam Energy Scan program.

[1] Y. Burnier, D. Kharzeev, J. Liao, and H. Yee, Phys.Rev.Lett.107(2011)052303.
[2] L. Adamczyk et al [STAR Collaboration], Phys.Rev.Lett.114(2015)252302.
[3] L. Adamczyk et al [STAR Collaboration], Phys.Rev.Lett.110(2013)142301.