Study of Chiral Charge Separation Effect in Relativistic Heavy Ion Collisions

FENG Shengqin; PEI Lei; SUN Fei; AI Xin; ZHONG Yang; YIN Zhongbao

doi:10.11804/NuclPhysRev.34.03.557

The topological charge interactions in relativistic heavy ion collisions cause quark chirality imbalance, resulting in charge separation under the strong magnetic field and local P and CP violation. In this paper, the chiral charge separation at RHIC and LHC energies is systematically analyzed as functions of the collision centrality, the collision energy and the nuclear shielding factor. It is found that there is not a very close dependence of the chiral charge separation effect on the collision energies, but that has an important dependence on nuclear shielding factor. Compared with the non-shielding effect, the shielding effect can reduce the chiral separation effect obviously. Due to the shielding effect, the distribution of a₊₊(a_--) and the distribution of a_+-(a_-+) are asymmetric. One also finds that chiral separation effect, which is almost negligible when more close to the central collision, occurs mainly in the peripheral collision for larger impact parameter.

Study of Chiral Charge Separation Effect in Relativistic Heavy Ion Collisions

1. College of Science, China Three Gorges University, Yichang 443002, Hubei, China;

2. Institute of Particle Physics, Central China Normal University, Wuhan 100049, China

Funds: National Natural Science Foundation of China(11475068, 11247021); Natural Science Foundation of Hubei Province(2014CFB671)

Received Date: 2016-12-06

Rev Recd Date: 2017-03-30

Publish Date: 2017-07-18

Key words:

Abstract: The topological charge interactions in relativistic heavy ion collisions cause quark chirality imbalance, resulting in charge separation under the strong magnetic field and local P and CP violation. In this paper, the chiral charge separation at RHIC and LHC energies is systematically analyzed as functions of the collision centrality, the collision energy and the nuclear shielding factor. It is found that there is not a very close dependence of the chiral charge separation effect on the collision energies, but that has an important dependence on nuclear shielding factor. Compared with the non-shielding effect, the shielding effect can reduce the chiral separation effect obviously. Due to the shielding effect, the distribution of a₊₊(a_--) and the distribution of a_+-(a_-+) are asymmetric. One also finds that chiral separation effect, which is almost negligible when more close to the central collision, occurs mainly in the peripheral collision for larger impact parameter.

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Study of Chiral Charge Separation Effect in Relativistic Heavy Ion Collisions

doi: 10.11804/NuclPhysRev.34.03.557

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