{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.95210.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1800376"}},{"@id":"https://doi.org/10.1103/PhysRevC.106.034908","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2022","description":"Quark interactions with topological gluon configurations can induce local chirality imbalance and parity violation in quantum chromodynamics, which can lead to the chiral magnetic effect (CME) -- an electric charge separation along the strong magnetic field in relativistic heavy-ion collisions. The CME-sensitive azimuthal correlator observable ($\\Delta\\gamma$) is contaminated by background arising, in part, from resonance decays coupled with elliptic anisotropy ($v_{2}$). We report here differential measurements of the correlator as a function of the pair invariant mass ($m_{\\rm inv}$) in 20-50% centrality Au+Au collisions at $\\sqrt{s_{_{\\rm NN}}}$= 200 GeV by the STAR experiment at RHIC. Strong resonance background contributions to $\\Delta\\gamma$ are observed. At large $m_{\\rm inv}$ where this background is significantly reduced, the $\\Delta\\gamma$ value is found to be significantly smaller. An event-shape-engineering technique is deployed to determine the $v_{2}$ background shape as a function of $m_{\\rm inv}$. We extract a $v_2$-independent and $m_{\\rm inv}$-averaged signal $\\Delta\\gamma_{\\rm sig}$ = (0.03 $\\pm$ 0.06 $\\pm$ 0.08) $\\times10^{-4}$, or $(2\\pm4\\pm5)\\%$ of the inclusive $\\Delta\\gamma(m_{\\rm inv}>0.4$ GeV/$c^2$)$ =(1.58 \\pm 0.02 \\pm 0.02) \\times10^{-4}$, within pion $p_{T}$ = 0.2 - 0.8~\\gevc and averaged over pseudorapidity ranges of $-1 < \\eta < -0.05$ and $0.05 < \\eta < 1$. This represents an upper limit of $0.23\\times10^{-4}$, or $15\\%$ of the inclusive result, at $95\\%$ confidence level for the $m_{\\rm inv}$-integrated CME contribution.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t1","@type":"Dataset","description":"The $m_{\\rm inv}$ dependences of the OS and SS pion pair multiplicities in 20-50$\\%$ Au+Au collisions at 200 GeV.","name":"Table for Figure 2(a)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t2","@type":"Dataset","description":"The $m_{\\rm inv}$ dependences of the $\\gamma_{OS}$, $\\gamma_{SS}$ in 20-50$\\%$ Au+Au collisions at 200 GeV.","name":"Table for Figure 2(b)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t3","@type":"Dataset","description":"$m_{\\rm inv}$ dependences of the relative excess of OS over SS pion pairs in 20-50$\\%$ Au+Au collisions at 200 GeV.","name":"Table for Figure 3(a)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t4","@type":"Dataset","description":"$m_{\\rm inv}$ dependences of $\\Delta\\gamma$ in 20-50$\\%$ Au+Au collisions at 200 GeV.","name":"Table for Figure 3(b)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t5","@type":"Dataset","description":"The $\\pi$ pair $\\Delta\\gamma$ at $m_{\\rm inv} &gt; m_{\\rm inv}^{\\rm low}$ for the data identified by TPC and more extended...","name":"Table for Figure 4"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t6","@type":"Dataset","description":"The elliptic flow $v_2$ in bins of $q_2$ for the three centrality bins in the 20-50$\\%$ range of Au+Au collisions...","name":"Table for Figure 5"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t7","@type":"Dataset","description":"$m_{\\rm inv}$ dependences of the $\\Delta\\gamma$ from ESE-selected event samples A (50$\\%$ largest $q_{2}$) and B (50$\\%$ smallest $q_{2}$) in...","name":"Table for Figure 6(a)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t8","@type":"Dataset","description":"$m_{\\rm inv}$ dependences of the $\\rm \\Delta\\gamma_{A} - \\Delta\\gamma_{B}$ in 20-50$\\%$ Au+Au collisions at 200 GeV.","name":"Table for Figure 6(b)"},{"@id":"https://doi.org/10.17182/hepdata.95210.v1/t9","@type":"Dataset","description":"$\\Delta\\gamma_{\\rm A}$ versus $\\Delta\\gamma_{\\rm B}$ in 20-50$\\%$ Au+Au collisions at 200 GeV. (The data are arranged as function of mass)","name":"Table for Figure 7"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1800376?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/95210"}],"inLanguage":"en","name":"Pair invariant mass to isolate background in the search for the chiral magnetic effect in Au+Au collisions at $\\sqrt{s_{_{\\rm NN}}}$= 200 GeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1800376?version=1","version":1}