标题：Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR
作者：Zhao, Jie; Adam, J.; Adamczyk, L.; Adams, J. R.; Adkins, J. K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Anderson 更多
作者机构：[Zhao, Jie] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47906 USA.; [Drachenberg, J. L.] Abilene Christian Univ, Abilene, TX 79699 USA.; [Ada 更多
会议名称：27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter)
会议日期：MAY 13-19, 2018
来源：NUCLEAR PHYSICS A
关键词：QCD; heavy-ion collisions; chiral magnetic effect; invariant mass;; reaction plane; participant plane
摘要：Using two novel methods, pair invariant mass (m(inv)) and comparative measurements with respect to reaction plane (Psi(RP)) and participant plane (Psi(PP)), we isolate the possible chiral magnetic effect (CME) from backgrounds in 200 GeV Au+Au collisions at STAR. The invariant mass method identifies the resonance background contributions, coupled with the elliptic flow (v(2)), to the charge correlator CME observable (Delta gamma). At high mass (m(inv) > 1.5 GeV/c(2)) where resonance contribution is small, we obtain the average Delta gamma magnitude. In the low mass region (m(inv) < 1.5 GeV/c(2)), resonance peaks are observed in Delta gamma(m(inv)). An event shape engineering (ESE) method is used to model the background shape in m(inv) to extract the potential CME signal at low m(inv). In the comparative method, the Psi(RP) is assessed by spectator neutrons measured by the ZDCs, and the Psi(PP) by the 2nd-harmonic event plane measured by the TPC. The v(2) is stronger along Psi(PP) and weaker along Psi(RP); in contrast, the magnetic field, mainly from spectator protons, is weaker along Psi(PP) and stronger along Psi(RP). As a result, the Delta gamma measured with respect to Psi(RP) and Psi(PP) contain different amounts of CME and background, and can thus determine these two contributions. It is found that the possible CME signals with background isolation by these two novel methods are small, on the order of a few percent of the inclusive Delta gamma measurements.