Atacan Fatih Candar | Searcharxiv

arXiv2026

Neutron tagging of heavy lepton pair production at RHIC and LHC energies

We calculated cross sections for $γγ\rightarrow \ell^+\ell^-$ ($\ell=e,μ,τ$) production in ultraperipheral gold and lead collisions and compare our results with recent measurements from the STAR, ALICE, ATLAS, and CMS experiments at center of mass energies $\sqrt{s_{NN}}=200$ GeV, $\sqrt{s_{NN}}=2.76 $ TeV, and $\sqrt{s_{NN}}=5.02$ TeV. The calculations are performed within lowest order quantum electrodynamics (LO QED) using a Monte Carlo technique for calculating the impact parameter dependent probability, and subsequently combined with neutron emission probabilities associated with Coulomb excitation of the nuclei. These neutron emission scenarios are modeled using a Poisson statistics, allowing the cross sections to be categorized into experimentally relevant neutron classes: 0n0n, 0n1n, 1n1n, 0nXn, XnXn, and inclusive (0n0n+0nXn+XnXn) production. To enable a direct comparison with experiments, fiducial phase space restrictions corresponding to the acceptance of each detector are implemented.

hep-ph↗

arXiv2025

Electron positron pair production accompanied by giant dipole resonance at RHIC and LHC

In ultra-peripheral heavy ion collisions (UPCs), the broad energy spectrum of photons enables a variety of physical processes, ranging from lepton pair production to giant dipole resonances (GDRs). In this work, we evaluate production of electron-positron pair production cross section with GDR. Specifically, we focus on Au+Au collisions at a center of mass energy of $\sqrt{s_{NN}}=$ 200 GeV and Pb+Pb collisions of $\sqrt{s_{NN}}=$ 2.76 TeV per nucleon. We calculate cross sections while taking into account with and without the kinematic restrictions relevant to STAR detectors. We also present the differential cross sections in terms of the variables rapidity $(y)$, transverse momentum ($p_\perp$) and invariant mass ($M$) to compare them with respect to RHIC and LHC energies.

hep-ph↗