Effect of hadronic phase lifetime on identified particle production and elliptic flow in heavy-ion collisions

Abstract

This thesis presents the study of elliptic flow (v2) created in heavy-ion collisions. After getting a detailed idea about elliptic flow, a simulation of the collision of heavy nuclei (Xe+Xe) at √sNN = 5.44 TeV for 10 thousand events using the AMPT-SM model is done. The simulated data are anal- ysed to obtain the pT spectra and elliptic flow (v2) of identified charged particles. In this work, transverse momentum spectra (pT) are plotted for identi- fied particles such as π, K, K0, p, φ, and Λ in different centralities. Compar- ison of the pT-spectra shows that the differential yield of particles decreases with an increase in transverse momentum pT. Finally, the ”Elliptic flow” (v2) of identified particles is studied, which is a very important property for momentum anisotropies produced in the collective flow of the particle. The plot of v2 as a function of transverse momentum (pT) for different centrality is obtained. The non-zero value of v2 confirms the presence of anisotropy in the collective flow of identified particles. The elliptic flow of proton (baryon) is compared with a phi (meson), which is comparable in mass with different quark content. v2 vs pT is plotted for different central- ities. v2 vs pT is plotted for different hadronic cascade time, τHC, which show that v2 increases with an increase in τHC. The plot of average elliptic flow (< v2 >) of the charged particle as a function of centrality shows that it increases gradually up to mid-central collisions and then starts decreasing for the peripheral collisions.