Dilepton Production in p+p, Au+Au collisions atsNN=200GeVand U+U collisions atsNN=193GeV

Realistic interactions and dilepton production off pp-collisions

We present a model for dilepton production of proton-proton collisions using a realist T -matrix that by incorporating ∆ degrees of freedom fits the NN scattering data up to 2 GeV. The results we find differ in details from earlier work that use less sophisticated interactions but the overall agreement with these calculations is good. Typeset using REVTEX 1

Low-mass dilepton production in pp and AA collisions

We adopt a factorized QCD formalism to describe the transverse momentum distribution of lowmass lepton pairs produced in pp collisions, when the pair transverse momentum QT ≫ Q, with the pair’s invariant mass Q as low as Q ∼ ΛQCD. We extend this formalism to dilepton production in AA collisions by including the nuclear dependent power correction due to parton multiple scattering.

Dilepton Production in Relativistic Heavy Ion Collisions

The present status of our understanding of low mass dilepton production in relativistic heavy ion collisions is discussed. The focus of the discussion will be the sensitivity of dilepton measurements to in medium changes of hadrons and the restoration of chiral symmetry. We will finally discuss how the presence of strong long wavelength pion modes, i.e. disoriented chiral condensates can be see...

Dilepton production in ultrarelativistic heavy-ion collisions.

Many probes have been proposed to map out the behaviour of hot and dense hadronic matter and also to highlight its eventual transition to a plasma of quarks and gluons. It is outside the scope of this talk to review them all or even partially: we will concentrate on electromagnetic radiation and more specifically on the emission of thermal lepton pairs. Those suffer minimal final state interact...

Diffractive J/ψ production in Ultraperipheral AuAu Collisions at RHIC