Optimizing the Parton Showers in PYTHIA8 for Xe–Xe collision at 5.44 TeV

Abstract

We present the doubly differential invariant yield of primary charged particles [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], [Formula: see text] in Xe–Xe collisions at [Formula: see text] = 5.44 TeV, as a function of [Formula: see text] in kinematic region of [Formula: see text] and for the pseudorapidity interval of [Formula: see text] by using PYTHIA8 tuned to different Parton Showers like Simple Showers (Time-Like, Space-Like), DIRE and VINCIA Showers. The predictions of hard and soft QCD processes of Parton Showers are then compared with the ALICE data at different centrality classes of 0–5%, 50–60% and 70–80%. The observed deviations are connected with the kinematics involved and are mostly due to the color coherence and soft gluon emission from parton pairs. As PYTHIA8 does not take into account the Cronin effect, thus the deviation at low [Formula: see text] is due to Cronin effect. The nuclear modification factor is constructed and it is observed that the signal is less than unity or suppression is seen which is coming from Parton Showers.