Electromagnetic Radiations from Heavy Ion Collision

In this review, we have discussed the different sources of photons and dileptons produced in heavy ion collision (HIC). The transverse momentum (pT) spectra of photons for different collision energies are analyzed with a view of extracting the thermal properties of the system formed in HIC. We showe...

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Main Authors: Payal Mohanty, Sabyasachi Ghosh, Sukanya Mitra
Format: Article
Language:English
Published: Hindawi Limited 2013-01-01
Series:Advances in High Energy Physics
Online Access:http://dx.doi.org/10.1155/2013/176578
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spelling doaj-35bc31846de64a8889aeb227d5daf8432020-11-25T01:57:55ZengHindawi LimitedAdvances in High Energy Physics1687-73571687-73652013-01-01201310.1155/2013/176578176578Electromagnetic Radiations from Heavy Ion CollisionPayal Mohanty0Sabyasachi Ghosh1Sukanya Mitra2HENPP Division, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, IndiaTheoretical Physics Division, Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700064, IndiaTheoretical Physics Division, Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700064, IndiaIn this review, we have discussed the different sources of photons and dileptons produced in heavy ion collision (HIC). The transverse momentum (pT) spectra of photons for different collision energies are analyzed with a view of extracting the thermal properties of the system formed in HIC. We showed the effect of viscosity on pT spectra of produced thermal photons. The dilepton productions from hot hadrons are considered including the spectral change of light vector mesons in the thermal bath. We have analyzed the pT and invariant mass (M) spectra of dileptons for different collision energies too. As the individual spectra are constrained by certain unambiguous hydrodynamical inputs, so we evaluated the ratio of photon to dilepton spectra, Rem, to overcome those quantities. We argue that the variation of the radial velocity extracted from Rem with M is indicative of a phase transition from the initially produced partons to hadrons. In the calculations of interferometry involving dilepton pairs, it is argued that the nonmonotonic variation of HBT radii with invariant mass of the lepton pairs signals the formation of quark gluon plasma in HIC. Elliptic flow (v2) of dilepton is also studied at sNN=2.76 TeV for 30–40% centrality using the (2+1)d hydrodynamical model.http://dx.doi.org/10.1155/2013/176578
collection DOAJ
language English
format Article
sources DOAJ
author Payal Mohanty
Sabyasachi Ghosh
Sukanya Mitra
spellingShingle Payal Mohanty
Sabyasachi Ghosh
Sukanya Mitra
Electromagnetic Radiations from Heavy Ion Collision
Advances in High Energy Physics
author_facet Payal Mohanty
Sabyasachi Ghosh
Sukanya Mitra
author_sort Payal Mohanty
title Electromagnetic Radiations from Heavy Ion Collision
title_short Electromagnetic Radiations from Heavy Ion Collision
title_full Electromagnetic Radiations from Heavy Ion Collision
title_fullStr Electromagnetic Radiations from Heavy Ion Collision
title_full_unstemmed Electromagnetic Radiations from Heavy Ion Collision
title_sort electromagnetic radiations from heavy ion collision
publisher Hindawi Limited
series Advances in High Energy Physics
issn 1687-7357
1687-7365
publishDate 2013-01-01
description In this review, we have discussed the different sources of photons and dileptons produced in heavy ion collision (HIC). The transverse momentum (pT) spectra of photons for different collision energies are analyzed with a view of extracting the thermal properties of the system formed in HIC. We showed the effect of viscosity on pT spectra of produced thermal photons. The dilepton productions from hot hadrons are considered including the spectral change of light vector mesons in the thermal bath. We have analyzed the pT and invariant mass (M) spectra of dileptons for different collision energies too. As the individual spectra are constrained by certain unambiguous hydrodynamical inputs, so we evaluated the ratio of photon to dilepton spectra, Rem, to overcome those quantities. We argue that the variation of the radial velocity extracted from Rem with M is indicative of a phase transition from the initially produced partons to hadrons. In the calculations of interferometry involving dilepton pairs, it is argued that the nonmonotonic variation of HBT radii with invariant mass of the lepton pairs signals the formation of quark gluon plasma in HIC. Elliptic flow (v2) of dilepton is also studied at sNN=2.76 TeV for 30–40% centrality using the (2+1)d hydrodynamical model.
url http://dx.doi.org/10.1155/2013/176578
work_keys_str_mv AT payalmohanty electromagneticradiationsfromheavyioncollision
AT sabyasachighosh electromagneticradiationsfromheavyioncollision
AT sukanyamitra electromagneticradiationsfromheavyioncollision
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