Production of Direct Photons in Lead-Lead Collisions
Author | : Pijll |
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Total Pages | : |
Release | : 2007 |
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Author | : Pijll |
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Total Pages | : |
Release | : 2007 |
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Author | : Jaroslav Adam |
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Total Pages | : 0 |
Release | : 2016 |
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Release | : 2016 |
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In this work it is shown that the use of a hydrodynamical model of heavy-ion collisions which incorporates recent developments, together with updated photon emission rates, greatly improves agreement with both ALICE and PHENIX measurements of direct photons, supporting the idea that thermal photons are the dominant source of direct photon momentum anisotropy. The event-by-event hydrodynamical model uses the impact parameter dependent Glasma model (IP-Glasma) initial states and includes, for the first time, both shear and bulk viscosities, along with second-order couplings between the two viscosities. Furthermore, the effect of both shear and bulk viscosities on the photon rates is studied, and those transport coefficients are shown to have measurable consequences on the photon momentum anisotropy.
Author | : P.H. Hansen |
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Total Pages | : 41 |
Release | : 1987 |
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Author | : Björn Bäuchle |
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Total Pages | : 0 |
Release | : 2010 |
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Author | : Tadaaki Isobe |
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Total Pages | : 216 |
Release | : 2007 |
Genre | : Heavy ion collisions |
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Total Pages | : 15 |
Release | : 2015 |
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The recent results on direct photons and dileptons in high energy heavy ion collisions, obtained particularly at RHIC and LHC are reviewed. The results are new not only in terms of the probes, but also in terms of the precision. We shall discuss the physics learned from the results.
Author | : Panayiotis Mouzourakis |
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Total Pages | : 187 |
Release | : 1980 |
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Release | : 2008 |
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Direct photons are ideal tools to investigate kinematical and thermodynamical conditions of heavy ion collisions since they are emitted from all stages of the collision and once produced they leave the interaction region without further modification by the medium. The PHENIX experiment at RHIC has measured direct photon production in p+p and Au+Au collisions at 200 GeV over a wide transverse momentum (p{sub T}) range. The p+p measurements allow a fundamental test of QCD, and serve as a baseline when we try to disentangle more complex mechanisms producing high p{sub T} direct photons in Au+Au. As for thermal photons in Au+Au we overcome the difficulties due to the large background from hadronic decays by measuring 'almost real' virtual photons which appear as low invariant mass ee− pairs: a significant excess of direct photons is measured above the above next-to-leading order perturbative quantum chromodynamics calculations. Additional insights on the origin of direct photons can be gained with the study of the azimuthal anisotropy which benefits from the increased statistics and reaction plane resolution achieved in RHIC Year-7 data.
Author | : Thomas Peitzmann |
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Total Pages | : 72 |
Release | : 2002 |
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