Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-07
Phys.Rev.Lett.107:052303,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.107.052303
Chiral Magnetic Wave (CMW) is a gapless collective excitation of quark-gluon plasma in the presence of external magnetic field that stems from the interplay of Chiral Magnetic (CME) and Chiral Separation Effects (CSE); it is composed by the waves of the electric and chiral charge densities coupled by the axial anomaly. We consider CMW at finite baryon density and find that it induces the electric quadrupole moment of the quark-gluon plasma produced in heavy ion collisions: the "poles" of the produced fireball (pointing outside of the reaction plane) acquire additional positive electric charge, and the "equator" acquires additional negative charge. We point out that this electric quadrupole deformation lifts the degeneracy between the elliptic flows of positive and negative pions leading to $v_2(\pi^+) < v_2(\pi^-)$, and estimate the magnitude of the effect.
Burnier Yannis
Kharzeev Dmitri E.
Liao Jinfeng
Yee Ho-Ung
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