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Open Access Publications from the University of California

Acoplanarity of a Lepton Pair to Probe the Electromagnetic Property of Quark Matter.

  • Author(s): Klein, Spencer;
  • Mueller, AH;
  • Xiao, Bo-Wen;
  • Yuan, Feng
  • et al.

We investigate the P_{T}-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 P_{T}-broadening effect provides a unique probe to the magnetic effect.

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