Abstract
We report the measurements of μ+μ− pair production for pT < 0.10 GeV/c in 40-80% Au+Au collisions at √SNN = 200 GeV at STAR. A significant enhancement with respect to the hadronic cocktail is observed. The pT2 and ∆ϕ distributions of the excess yields are also reported and compared with model calculations. The EPA-QED calculations can describe the data very well within uncertainties.
Highlights
Dileptons are produced in the whole evolution of the heavy-ion collisions and escape with minimum interaction with the strongly interacting medium
Dilepton measurements play an important role in the study of hot and dense nuclear matter produced in Relativistic Heavy Ion Collider (RHIC) [1, 2]
While such photon-photon interactions were traditionally studied in ultra-peripheral collisions without any nuclear overlaps [4,5,6], they could provide a novel probe to the Quark Gluon Plasma (QGP) created in peripheral collisions since the very-low-pT dileptons are produced in the early stage of the collisions [7]
Summary
Dileptons are produced in the whole evolution of the heavy-ion collisions and escape with minimum interaction with the strongly interacting medium. The excess can be explained by photon-photon interactions induced by the extremely strong electromagnetic field produced by the fast moving heavy ions While such photon-photon interactions were traditionally studied in ultra-peripheral collisions without any nuclear overlaps [4,5,6], they could provide a novel probe to the Quark Gluon Plasma (QGP) created in peripheral collisions since the very-low-pT dileptons are produced in the early stage of the collisions [7]. Measurements of μ+μ− pair provide a complementary channel to investigate these phenomena and constrain the photon interaction in heavy-ion collisions. In this proceeding, we will present invariant mass distributions of μ+μ− pair production at pT < 0.10 GeV/c, as well as pT distributions. Theoretical calculations [13,14,15] will be compared with data
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