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Photoproductions of dileptons, photons, and light vector mesons inp−p,p−Pb, andPb−Pbcollisions at Large Hadron Collider energies
Physical Review D  (IF5.296),  Pub Date : 2021-10-20, DOI: 10.1103/physrevd.104.074023
Zhi-Lei Ma, Zhun Lu, Jia-Qing Zhu, Li Zhang

The photoproduction of large pT dileptons, photons, and light vector mesons in pp, pPb, and PbPb collisions at LHC energies is studied, where the fragmentation processes and the ultra-incoherent photon channel are included. An exact treatment is developed for photoproduction processes in heavy ion collisions, which recovers the equivalent photon approximation (EPA) in the limit Q20 and can avoid double counting effectively. The full kinematical relations are also achieved. We present the results as the distributions in Q2, pT, and yr, and the total cross sections are also estimated. The numerical results indicate that the contribution of photoproduction processes is evident in the large pT and yr regions and starts to play a fundamental role in pPb collisions. The ultra-incoherent photon emission is an important channel of photoproduction processes, which can provide the meaningful contributions. EPA is only applicable in small y and Q2 domains and is very sensitive to the values of ymax and Qmax2. The EPA errors appear when y>0.29 and Q2>0.1GeV2 and are rather serious in pPb and PbPb collisions. When dealing with widely kinematical regions, the exact treatment needs to be adopted.