Abstract
We calculate the yield and elliptic flow of mid-rapidity dileptons emitted from the quark-gluon plasma generated in Pb-Pb collisions at LHC. We use relativistic anisotropic hydrodynamics for the 3+1 dimensional evolution of the quark-gluon plasma and convolve this with the momentum-anisotropic local rest frame production rate for dileptons. The effects of momentum anisotropy of the quark distribution functions, viscosity to entropy density ratio, centrality of the collisions, and initial momentum anisotropy on the results are investigated and discussed.
Highlights
Extensive phenomenological investigations of the results emerging from high-energy heavy-ion collision experiments at RHIC and LHC have provided a broad but still incomplete picture of the physics of hot and dense strongly interacting matter [1,2,3,4]
We emphasize the importance of incorporating momentum-anisotropic local rest frame dilepton rates along with the relativistic anisotropic hydrodynamical evolution of the quark-gluon plasma (QGP)
The value of T0 1⁄4 0.6 GeV was tuned for 4πη=s 1⁄4 2 assuming no initial momentum anisotropy, for a QGP with initial momentum anisotropy, we found that, with the same value of η=s, the initial temperature of T0 1⁄4 0.58 GeV provides the best fit of model calculations to the hadron spectra which is shown in the right panel of Fig. 11
Summary
Extensive phenomenological investigations of the results emerging from high-energy heavy-ion collision experiments at RHIC and LHC have provided a broad but still incomplete picture of the physics of hot and dense strongly interacting matter [1,2,3,4]. Electromagnetic probes such as real photons, leptons, and dileptons (virtual photons) can be generated during all stages of the evolution of the strongly interacting matter and, when produced, they can escape with much larger mean free paths than hadrons They may provide information about the effective temperature and momentum distribution of each stage. Hydrodynamical models have been shown to be able to reproduce experimental data for the collective flow of the hadrons formed in the central rapidity region [52,53,54,55] They have been used to integrate over the spacetime of the electromagnetic emission from the strongly interacting medium [22]. We focus mainly on intermediate dileptons with mass and transverse momentum above 1 GeV
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