Abstract

The NA61/SHINE experiment at the CERN SPS has recently extended its program for the energy scan with Pb ions. In the past, the NA49 experiment, which preceded the NA61/SHINE, has also recorded data for Pb–Pb collisions at different energies. Together, the two experiments cover wide range of collision energies in the beam momentum range of 13–150A GeV/\(c\) provided by CERN SPS, which has a significant overlap with the ongoing second phase of the beam energy scan program (BES-II) at RHIC. The directed and elliptic flow relative to the projectile spectator plane are measured with the new NA61/SHINE data for Pb–Pb collisions at 13 and 30A GeV/\(c\) and revised existing NA49 data at 40A GeV. New results extend the existing world data available from the previous NA49 measurements and ongoing BES-II and fixed-target programs at STAR. The developed analysis techniques are also relevant for measurements at the future CBM experiment at FAIR and the MPD experiment at NICA.

中文翻译：

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在CERN SPS上通过NA61 / SHINE和NA49光束动量扫描程序进行各向异性流量测量

摘要

CERN SPS的NA61 / SHINE实验最近扩展了其对Pb离子进行能量扫描的程序。过去，在NA61 / SHINE之前的NA49实验还记录了不同能量下Pb-Pb碰撞的数据。这两个实验一起涵盖了CERN SPS提供的光束动量范围为13–150 A GeV / \（c \）的宽范围的碰撞能量，该能量与正在进行的光束能量扫描程序的第二阶段有很大的重叠（ BES-II）。使用新的NA61 / SHINE数据（在13和30 A GeV / \（c \）下针对Pb–Pb碰撞）和相对于弹丸观众平面的椭圆流进行了修正，并在40 A下对现有的NA49数据进行了修订。GeV。新的结果扩展了以前的NA49测量以及STAR正在进行的BES-II和固定目标计划所提供的现有世界数据。发达的分析技术也与FAIR未来的CBM实验和NICA的MPD实验相关。