Centrality dependence of dilepton production via $\gamma \gamma$ processes from Wigner distributions of photons in nuclei

Antoni Szczurek; Mariola K{\l}usek-Gawenda; Wolfgang Sch\"afer

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arxiv 2012.11973 v2 pith:CAWUKC5V submitted 2020-12-22 hep-ph hep-th

Centrality dependence of dilepton production via γ γ processes from Wigner distributions of photons in nuclei

Mariola K{\l}usek-Gawenda , Wolfgang Sch\"afer , Antoni Szczurek This is my paper

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keywords distributionscalculatecentralitydatadifferentdileptongammaphotons

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We propose a new complete method, based on the Wigner distributions of photons, how to calculate differential distributions of dileptons created via photon-photon fusion in semicentral ($b<2R_A$) $AA$ collisions. The formalism is used to calculate different distributions of invariant mass, dilepton transverse momentum and acoplanarity for different regions of centrality. The results of calculation are compared with recent STAR, ALICE and ATLAS experimental data. Very good agreement with the data is achieved without free parameters and without including additional mechanisms such as a possible rescattering of leptons in the quark-gluon plasma.

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hep-ph 2021-06 unverdicted novelty 5.0

Derived an analog pocket formula for DPS c cbar l+l- production in AA UPCs including elastic and inelastic photon contributions and presented differential cross section predictions at LHC energies.