6533b837fe1ef96bd12a32c5
RESEARCH PRODUCT
What to learn from dilepton transverse momentum spectra in heavy-ion collisions?
Jörg RuppertThorsten RenkThorsten Renksubject
PhysicsNuclear and High Energy PhysicsParticle physicsMeson010308 nuclear & particles physicsPhase (waves)FOS: Physical sciencesRadiation01 natural sciencesSpectral lineMomentumTransverse planeHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Flow (mathematics)0103 physical sciencesInvariant massHigh Energy Physics::Experiment010306 general physicsNuclear Experimentdescription
Recently the NA60 collaboration has presented high precision measurements of dimuon spectra double differential in invariant mass $M$ and transverse pair momentum $p_T$ in In-In collisions at $158 {\rm AGeV}$. While the $M$-dependence is important for an understanding of in-medium changes of light vector mesons and is $p_T$ integrated insensitive to collective expansion, the $p_T$-dependence arises from an interplay between emission temperature and collective transverse flow. This fact can be exploited to derive constraints on the evolution model and in particular on the contributions of different phases of the evolution to dimuon radiation into a given $M$ window. We present arguments that a thermalized evolution phase with $T > 170 {\rm MeV}$ leaves its imprint on the spectra.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-02-01 |