Pseudo-critical enhancement of thermal photons in relativistic heavy-ion collisions?
| Pub type: | Article |
| Citation: | van2015pseudo |
| Status: | Published |
| Journal: | Nuclear Physics A |
| Volume: | 933 |
| Year: | 2015 |
| Month: | September |
| Pages: | 256-271 |
| Publisher: | Elsevier |
| ISSN: | 0375-9474 |
| URL: | http://www.sciencedirect.com/s... |
| DOI: | 10.1016/j.nuclphysa.2014.09.009 |
| Abstract: | We compute the spectra and elliptic flow of thermal photons emitted in ultrarelativistic heavy-ion collisions (URHICs) at \{RHIC\} and LHC. The thermal emission rates are taken from complete leading-order rates for the \{QGP\} and hadronic many-body calculations including baryons and antibaryons, as well as meson-exchange reactions (including Bremsstrahlung). We first update previous thermal fireball calculations by implementing a lattice-QCD based equation of state and extend them to compare to recent \{LHC\} data. We then scrutinize the space–time evolution of Au–Au collisions at \{RHIC\} by employing an ideal hydrodynamic model constrained by bulk- and multistrange-hadron spectra and elliptic flow, including a non-vanishing initial flow. We systematically compare the evolutions of temperature, radial flow, azimuthal anisotropy and four-volume, and exhibit the temperature profile of thermal photon radiation. Based on these insights, we put forward a scenario with a “pseudo-critical enhancement” of thermal emission rates, and investigate its impact on \{RHIC\} and \{LHC\} direct photon data. |
| Month_val: | 9 |
| Sig contrib: | R. Rapp |
| Keywords: | Direct photons, Heavy-ion collisions, QCD phase diagram |
| Authors: | |
| Added by: | [mkm] |
| Total mark: | 0 |
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