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 the LHC energy regime. The sensitivity of octupole deformation ${\beta }_3$ to the QGP observables is presented by employing the Monte Carlo HYDJET++ model. Motivated by the discrepancies in the $v_2$-to-$v_3$ 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 the HYDJET++ framework, we calculate the pseudorapidity distribution, transverse momentum ($p_{\mathrm{T}}$) spectra, and average anisotropic flow ($v_2$ and $v_3$) of primary charged hadrons with different parameters in two geometrical configurations: body-body and tip-tip types of Pb--Pb collisions. The kinematic ranges $0<p_{\mathrm{T}}<20\mathrm{GeV}/c$ and $|\eta |<0.8$ are considered. We observe that the charged hadron multiplicity and transverse momentum spectra are dependent on the strength of the octupole deformation parameter. The $⟨v_2⟩$ and $⟨v_3⟩$ in body-body collisions show a weak positive correlation with ${\beta }_3$, while the average anisotropic flow in tip-tip collisions is weakly correlated with ${\beta }_3$ in the most-central collision region.

5 pages, 7 figures

References in corpus (7)

• CP Violation in Leptonic Rare $B_s^0$ Decays as a Probe of New Physics
• Heavy ion event generator HYDJET++ (HYDrodynamics plus JETs)
• A Fast Hadron Freeze-out Generator
• Fast hadron freeze-out generator, part II: noncentral collisions
• Gluon shadowing in the Glauber-Gribov model at HERA
• Pseudorapidity density, transverse momentum spectra, and elliptic flow studies in Xe-Xe collision systems at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}=5.44TeV$ using the HYDJET++ model
• Transverse momentum spectra and suppression of charged hadrons in deformed Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV using HYDJET++ model