What to learn from dilepton transverse momentum spectra in heavy-ion collisions?

@article{Ruppert2007WhatTL,
  title={What to learn from dilepton transverse momentum spectra in heavy-ion collisions?},
  author={Jorg Ruppert and Thorsten Renk},
  journal={Journal of Physics G},
  year={2007},
  volume={34},
  pages={1047-1050}
}
Recently the NA60 collaboration has presented high precision measurements of dimuon spectra double differential in invariant mass M and transverse pair momentum pT in In–In collisions at 158 A GeV. While the M-dependence is important for an understanding of in-medium changes of light vector mesons and is pT integrated insensitive to collective expansion, the pT-dependence arises from an interplay between emission temperature and collective transverse flow. This fact can be exploited to derive… 
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Low mass dimuons produced in relativistic nuclear collisions.
The NA60 experiment has measured low mass muon pair production in In-In collisions at 158A GeV with unprecedented precision. We show that these data are reproduced very well by a dynamical model with

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