Study of octupole deformations in Pb-Pb collisions at 5.02 TeV

Abstract

In this letter, we present the study of the role of octupole deformation in non-spherical nuclei in most-central Pb-Pb collisions at LHC energy regime. The sensitivity of octupole deformation β3 to the QGP observables is presented by employing Monte-Carlo HYDJET++ model. Motivated by the discrepancies in the v2-to-v3 puzzle found in Pb-Pb collisions and the low-energy nuclear structure calculations of nuclear deformation, we studied the first basic observables necessary for any study in heavy-ion collisions. Using HYDJET++ framework, we calculate the pseudorapidity distribution, transverse momentum (pT) spectra and average anisotropic flow (v2 and v3) of primary charged hadrons with different parameters in two geometrical configurations: body-body and tip-tip type of Pb-Pb collisions. The kinematic ranges 0<pT<20 GeV/c and |η|<0.8 are considered. We observe that the charged hadron multiplicity and transverse momentum spectra are dependent on the strength of octupole deformation parameter. 〈v2〉 and 〈v3〉 in body-body collisions show weak positive correlation with β3 while average anisotropic flow in tip-tip collisions are weakly correlated to β3 in most-central collision region.