A Study Of Charge Separation Effect And Chiral Magnetic Wave In Strong Magnetic Fields At RHIC

Beginning with the fundamental background of high energy physics and particle physics, this dissertation introduces the purpose and research method of relativistic heavy ion collisions, along with the RHIC-STAR experiment. The study of Quark Gluon Plasma as well as searching of corresponding phase tran-sition are also discussed in detail. In particular, this dissertation concentrates on the phenomenological and experimental study of local CP violation in the early stage of QGP proposed by theoretical work. It is suggested that the so-called Chiral Magnetic Effect (CME) and Chiral Magnetic Wave(CMW) may give rise to such a P or CP violation locally.We use a multi-phase transport model with a string-melting scenario to test CME via constructing local charge separation in order to simulate those P-and CP-odd domain "bubble". We present the two-particle correlator <cos(Φα±Φβ)> as a function of centrality. Our results suggest that a domain-based scenario with final state interactions can describe the RHIC-STAR measurements of both same-and opposite-charge azimuthal angle correlations in Au+Au collisions at (?)sNN=200GeV. The occupancy factor of the total volume of domains over the fireball volume is small, which indicates that the size and number of metastable domains should be relatively small in the early stage of QGP.Elliptic (v2) and triangular (v3) flow of charged pions (π) and v2of kaons (K) at low transverse momenta (0.15<pT<0.5GeV/c) are also studied as a function of event charge asymmetry (Ach) in Au+Au collisions at (?)sNN=200GeV and U+U collisions at (?)sNN=193GeV recorded by the STAR experiment at RHIC. The slopes of the difference between negatively and positively charged pion v2and v3(△v2and△v3) as a function of Ach are extracted for different centrality intervals. The comparison between the slope of△v2(Ach) and△v3(Ach) suggests that it is unlikely dominated by the effect of local charge conservation at freeze-out. Our results provide new constraints on backgrounds in the search for effects of the chiral magnetic wave in heavy-ion collisions. The density distributions of large nuclei are typically modeled with a Woods-Saxon distribution characterized by a radius Ro and skin depth a. Deformation parameters β are then introduced to describe non-spherical nuclei. But when a nucleus is non-spherical, the Ro and a inferred from electron scattering experi-ments that integrate over all nuclear orientations cannot be used directly as the parameters in the Woods-Saxon distribution. This dissertation also presents and tabulates the newly-calculated Ro, a, and β2parameters that when used in a Woods-Saxon distribution, will give results consistent with electron scattering data. We presents the calculation of the eccentricity ε2and ε3with the new and old parameters. We find that ε3is particularly senstive to a.