Results on angular distributions of thermal dileptons in nuclear collisions

The NA60 experiment at the CERN SPS has studied dimuon production in 158 AGeV In-In collisions. The strong pair excess above the known sources found in the mass region $0.2<M<2.5$ GeV has been previously interpreted as thermal radiation. In this paper results on the associated angular distribu...

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Autor principal: Usai, Gianluca
Lenguaje:eng
Publicado: 2009
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.nuclphysa.2009.10.108
http://cds.cern.ch/record/1193630
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author Usai, Gianluca
author_facet Usai, Gianluca
author_sort Usai, Gianluca
collection CERN
description The NA60 experiment at the CERN SPS has studied dimuon production in 158 AGeV In-In collisions. The strong pair excess above the known sources found in the mass region $0.2<M<2.5$ GeV has been previously interpreted as thermal radiation. In this paper results on the associated angular distributions for $M<1$ GeV, as measured in the Collins-Soper reference frame, are presented. The structure function parameters $\lambda$, $\mu$, $\nu$ are consistent with zero and the projected polar and azimuth angle distributions are uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-11936302023-03-14T19:18:18Zdoi:10.1016/j.nuclphysa.2009.10.108http://cds.cern.ch/record/1193630engUsai, GianlucaResults on angular distributions of thermal dileptons in nuclear collisionsNuclear Physics - ExperimentThe NA60 experiment at the CERN SPS has studied dimuon production in 158 AGeV In-In collisions. The strong pair excess above the known sources found in the mass region $0.2<M<2.5$ GeV has been previously interpreted as thermal radiation. In this paper results on the associated angular distributions for $M<1$ GeV, as measured in the Collins-Soper reference frame, are presented. The structure function parameters $\lambda$, $\mu$, $\nu$ are consistent with zero and the projected polar and azimuth angle distributions are uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.The NA60 experiment at the CERN SPS has studied dimuon production in 158 AGeV In-In collisions. The strong pair excess above the known sources found in the mass region 0.2 < M < 2.5 GeV has been previously interpreted as thermal radiation. In this paper results on the associated angular distributions for M < 1 GeV , as measured in the Collins-Soper reference frame, are presented. The structure function parameters λ , μ , ν are consistent with zero and the projected polar and azimuth angle distributions are uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.The NA60 experiment at the CERN SPS has studied dimuon production in 158 AGeV In-In collisions. The strong pair excess above the known sources found in the mass region $0.2<M<2.5$ GeV has been previously interpreted as thermal radiation. In this paper results on the associated angular distributions for $M<1$ GeV, as measured in the Collins-Soper reference frame, are presented. The structure function parameters $\lambda$, $\mu$, $\nu$ are consistent with zero and the projected polar and azimuth angle distributions are uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.arXiv:0907.4704oai:cds.cern.ch:11936302009-07-28
spellingShingle Nuclear Physics - Experiment
Usai, Gianluca
Results on angular distributions of thermal dileptons in nuclear collisions
title Results on angular distributions of thermal dileptons in nuclear collisions
title_full Results on angular distributions of thermal dileptons in nuclear collisions
title_fullStr Results on angular distributions of thermal dileptons in nuclear collisions
title_full_unstemmed Results on angular distributions of thermal dileptons in nuclear collisions
title_short Results on angular distributions of thermal dileptons in nuclear collisions
title_sort results on angular distributions of thermal dileptons in nuclear collisions
topic Nuclear Physics - Experiment
url https://dx.doi.org/10.1016/j.nuclphysa.2009.10.108
http://cds.cern.ch/record/1193630
work_keys_str_mv AT usaigianluca resultsonangulardistributionsofthermaldileptonsinnuclearcollisions

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