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1. Prompt photon production from RHIC to LHC
François Arleo / CERN-TH
Prompt photon production is a particularly interesting probe of the dense QCD medium formed in heavy-ion collisions at high energy. Single-inclusive spectra may indeed reveal whether the quenching measured in the pion sector is due to energy loss effects, while another exciting possibility would be to tag jet events using high-energy photons. In that talk, single-inclusive spectra in p-p and Au-Au collisions at RHIC energy will first be computed and compared to recent PHENIX measurements. I will then present double-inclusive photon-pion spectra and discuss how such photon-tagged correlations can be useful to probe the fragmentation dynamics in nuclear collisions at RHIC. Finally, photon-photon correlations at the LHC will be presented.
2. Direct photon production at RHIC
Stefan Bathe, University of California at Riverside
Direct photons do not interact strongly with the medium produced in relativistic heavy-ion collisions, which makes them an exceptional observable: at intermediate pT they provide information on the early stage of the collision; at high pT they constitute a crucial reference for the medium modification of high-pT hadron production which has been observed.
The PHENIX experiment at RHIC has found a significant excess of direct photons above the decay-photon background in Au+Au collisions at 200 GeV at both intermediate and high pT. Furthermore, direct photon production in p+p and d+Au collisions has been measured, allowing a fundamental test of QCD as well as constraining the effects of cold nuclear matter. A systematic study of direct photon production will be presented and put into the context of theoretical models and earlier measurements.
Organiser(s): Yiota Foka and Nicolas Borghini
More information: http://home.cern.ch/a/alicedoc/www/chic/
François Arleo / CERN-TH
Prompt photon production is a particularly interesting probe of the dense QCD medium formed in heavy-ion collisions at high energy. Single-inclusive spectra may indeed reveal whether the quenching measured in the pion sector is due to energy loss effects, while another exciting possibility would be to tag jet events using high-energy photons. In that talk, single-inclusive spectra in p-p and Au-Au collisions at RHIC energy will first be computed and compared to recent PHENIX measurements. I will then present double-inclusive photon-pion spectra and discuss how such photon-tagged correlations can be useful to probe the fragmentation dynamics in nuclear collisions at RHIC. Finally, photon-photon correlations at the LHC will be presented.
2. Direct photon production at RHIC
Stefan Bathe, University of California at Riverside
Direct photons do not interact strongly with the medium produced in relativistic heavy-ion collisions, which makes them an exceptional observable: at intermediate pT they provide information on the early stage of the collision; at high pT they constitute a crucial reference for the medium modification of high-pT hadron production which has been observed.
The PHENIX experiment at RHIC has found a significant excess of direct photons above the decay-photon background in Au+Au collisions at 200 GeV at both intermediate and high pT. Furthermore, direct photon production in p+p and d+Au collisions has been measured, allowing a fundamental test of QCD as well as constraining the effects of cold nuclear matter. A systematic study of direct photon production will be presented and put into the context of theoretical models and earlier measurements.
Organiser(s): Yiota Foka and Nicolas Borghini
More information: http://home.cern.ch/a/alicedoc/www/chic/