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Directed flow of quarks from the RHIC Beam Energy Scan measured by STAR

机译:通过星形测量的RHIC束能量扫描的定向夸克流动

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摘要

Directed flow (v(1)) is a good probe of the early-stage dynamics of collision systems, and the v(1) slope at midrapidity (dv(1)/dy vertical bar(y=0)) is sensitive to the system's equation of state. STAR has published v(1)(y) measurements for ten particle species (pi(+/-), p, (p) over bar, Lambda, (Lambda) over bar, phi, K-+/- and K-S(0)) in Au+Au collisions at eight beam energies from, root s(NN) = 7.7 GeV to 200 GeV. In this study, we employ a simple coalescence idea to decompose v(1) of hadrons into v(1) of constituent quarks. The dv(1)/dy values of (p) over bar, K- and (Lambda) over bar are used to test the coalescence sum rule for produced quarks. Data involving produced quarks support the coalescence picture at root s(NN) = 11,5 GeV to 200 GeV, and a sharp deviation from this picture is observed at 7.7 GeV. The dv(1)/dy of transported quarks is studied via net particles (net p and net Lambda). In these proceedings, we further extract the v(1) slopes of produced and transported quarks, assuming that the coalescence sum rule is valid.
机译:定向流动(V(1))是碰撞系统的早期动态的良好探针,中脂肪型的V(1)斜率(dv(1)/ dy垂直条(y = 0))对其敏感系统的状态方程。 STAR已发表于10种颗粒物种(PI(+/-),P,(P)的杆,Lambda,(Lambda)上方的v(1)(y)测量尺寸,PHI,K - + / - 和Ks(0 ))在八个光束能量的Au + Au碰撞中,根s(nn)= 7.7 gev到200 gev。在这项研究中,我们采用简单的聚结思想来分解v(1)的重子进入组成夸克的V(1)。通过杆(P)的DV(1)/ Dy值(P)上方的杆上的值用于测试产生夸克的聚结金额规则。涉及产生的夸克的数据支持根S(nn)= 11,5 gev至200 gev的聚结图像,并且在7.7 gev时观察到与该图片的急剧偏差。通过净粒子(净p和净λ)研究了运输夸克的DV(1)/ Dy。在这些程序中,我们进一步提取了产生和运输的夸克的v(1)斜率,假设聚结金额规则有效。

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