Acoplanarity of a Lepton Pair to Probe the Electromagnetic Property of Quark Matter
Résumé
We investigate the PT-broadening effects in dilepton production through photon-photon scattering in heavy ion collisions. The QED multiple interaction effect with the medium is found to be consistent with the recent observation of a low transverse momentum lepton pair from the ATLAS Collaboration at the LHC. We further comment on the magnetic broadening effect and point out a number of ways to disentangle these two mechanisms. In particular, the rapidity dependence of the PT-broadening effect provides a unique probe to the magnetic effect.
Mots clés
Nuclear Physics
effect: magnetic
multiple scattering: effect
lepton: transverse momentum
photon photon: scattering
transverse momentum: low
heavy ion: scattering
dilepton: production
quark: matter
quantum electrodynamics
rapidity dependence
electromagnetic
interpretation of experiments: CERN LHC Coll
planarity
interpretation of experiments: ATLAS