Study of charged particle production in U-U collisions in the wounded quark model

Abstract.

Recently, there has been a growing interest in the study of deformed uranium-uranium (U-U) collisions in its various geometrical configurations due to their usefulness in understanding the different aspects of quantum chromodynamics (QCD). In this paper we have studied the particle production in deformed U-U collisions at $\sqrt{s_{NN}} = 193$ GeV using the modified wounded quark model (WQM). At first, we have shown the variation of quark-nucleus inelastic scattering cross-section ( $\sigma_{qA}^{in}$ with respect to centralities for various geometrical orientations of U-U collisions in WQM. After that we have calculated the pseudorapidity density ( ${\rm d}n_{ch}/{\rm d} \eta$ within WQM using a two-component prescription. Further we have calculated the transverse energy density distribution ( ${\rm d}E_{T}/{\rm d} \eta$ along with the ratio of transverse energy to charged hadron multiplicity ( $E_{T}/N_{ch}$ for U-U collisions and compared them with the corresponding experimental data. We have shown the scaling behavior of ${\rm d}n_{ch}/{\rm d} \eta$ and ${\rm d}E_{T}/{\rm d} \eta$ for different initial geometry of U-U collision with respect to p -p data at $\sqrt{s_{NN}}= 200$ GeV. Furthermore we have shown the Bjorken energy density achieved in U-U collisions for various configurations and compared them with experimental data of Au-Au at 200GeV. We observe that the present model suitably describes the experimental data for minimum bias geometrical configuration of U-U collisions. An estimate for various observables in different initial geometries of U-U collisions is also presented which will be tested in future by experimental data.