Analysis Note: Directed flow $v_1$ of protons in the Xe+Cs(I) collisions at 3.8 AGeV

TL;DR

This paper reports measurements of directed flow $v_1$ of protons in Xe+Cs(I) collisions at 3.8 AGeV, analyzing their dependence on transverse momentum and rapidity, and comparing results with transport model calculations and previous data.

Contribution

It provides new $v_1$ measurements for protons in Xe+Cs(I) collisions at 3.8 AGeV, including systematic uncertainty analysis and comparison with models and other experiments.

Findings

$v_1$ varies with transverse momentum and rapidity.

Results are consistent with JAM transport model calculations.

Comparison with previous data highlights collision dynamics.

Abstract

In this note, we present the directed flow $v_1$ measurements of protons from Xe+Cs(I) collisions at 3.8 AGeV (BM@N run8). We show the datasets, event and track selection cuts, centrality definition, event plane reconstruction and resolution. The $v_1$ results are presented as function of transverse momentum ($p_T$) and rapidity ($y_{cm}$) for 10-30\% central Xe+Cs(I) collisions. The systematic uncertainty study will also be presented and discussed. The $v_1$ measurements are compared with results of JAM transport model calculations and published data from other experiments.