Multiple-scattering production of lepton pairs in ultraperipheral heavy-ion collisions

Abstract

Ultra-relativistic peripheral collisions of heavy ions at the CERN Large Hadron Collider (LHC) can produce copies of numbers of lepton pairs via the two-photon process. Since the energies of the heavy ions are so high, multipair production cross sections of the light leptons, especially electrons, are quite large so that it is possible to measure them experimentally. To calculate the multipair production probabilities, first, we should have an impact parameter dependence cross section. We have obtained a well-behaved impact parameter dependence cross section and by using the Monte Carlo methods, we have calculated multipair production cross sections of electrons and muons in Pb-Pb heavy-ion collisions at LHC energies. We have also used some experimental restrictions in our calculation to compare our findings with the experimental results.

Azimuthal Angular Asymmetry of Soft Gluon Radiation in Jet Production

“…Di-lepton production in this process has a long history [52][53][54][55][56][57][58][59][60][61][62][63] and has attracted great attention recently through comprehensive measurements at RHIC and the LHC [64][65][66][67][68][69][70]. Theory progress has also been made to understand the underlying physics [71][72][73][74][75][76][77][78][79][80][81][82]. We will show that the photon radiation can contribute to a significant cos(2φ) asymmetries in the kinematic region where the perturbative contribution dominates.…”