Light-by-light scattering in UPC at the LHC

2016/06/29 by Klusek-Gawenda, Mariola, Lebiedowicz, Piotr, Szczurek, Antoni
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1606.09038

Abstract

We discuss diphoton semi(exclusive) production in ultraperipheral PbPb collisions at energy of √s_NN= 5.5 TeV (LHC). The nuclear calculations are based on equivalent photon approximation in the impact parameter space. The cross sections for elementary γγ→ γγ subprocess are calculated including two different mechanisms: box diagrams with leptons and quarks in the loops and a VDM-Regge contribution with virtual intermediate hadronic excitations of the photons. We got relatively high cross sections in PbPb collisions (306 nb). This opens a possibility to study the γγ→ γγ (quasi)elastic scattering at the LHC. We find that the cross section for elastic γγ scattering could be measured in the lead-lead collisions for the diphoton invariant mass W_γγ ≈ 15-20 GeV.

Related

• γγ→ γγ scattering in ultrarelativistic UPC
• Diphoton production in lead-lead and proton-proton UPC
• Light-by-light scattering in ultraperipheral heavy-ion collisions at the\n LHC
• New theoretical results in ultrarelativistic ultraperipheral lead-lead collisions
• Measuring light-by-light scattering at the LHC and FCC