ANISOTROPIC FLOW MEASUREMENTS FROM THE NA61/SHINE AND NA49 BEAM MOMENTUM SCAN PROGRAMS AT CERN SPS

摘要

The NA61/SHINE experiment at 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 a 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 flows 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/c. 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.