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Statements

Subject Item
n2:RIV%2F68407700%3A21340%2F14%3A00223584%21RIV15-MSM-21340___
rdf:type
n8:Vysledek skos:Concept
rdfs:seeAlso
http://www.epj-conferences.org/articles/epjconf/abs/2014/03/epjconf_inpc2013_04006/epjconf_inpc2013_04006.html
dcterms:description
Using the color dipole formalism we study the production of direct photons in proton-nucleus and nucleus-nucleus collisions at energies corresponding to RHIC and LHC experiments. Prompt photons produced in a hard reaction are not accompanied with any final state interaction, either energy loss or absorption. Therefore, in the RHIC energy range besides small isotopic corrections one should not expect any nuclear effects at large p(T). However, data from the PHENIX experiment indicates a significant large-p(T) suppression in d + Au and central Au + Au collisions that cannot be accompanied by coherent phenomena. We demonstrate that such an unexpected result is subject to the energy sharing problem universally induced by multiple initial state interactions (ISI) at large p(T) and/or at forward rapidities. In the LHC kinematic region ISI corrections are irrelevant at mid rapidities but cause rather strong suppression at forward rapidities. We present for the first time predictions for expected nuclear effects at large pT in p + Pb and Pb + Pb collisions at different rapidities. We include and analyze also a contribution of coherent effects associated with gluon shadowing modifying nuclear effects predominantly at small and medium-high p(T) Using the color dipole formalism we study the production of direct photons in proton-nucleus and nucleus-nucleus collisions at energies corresponding to RHIC and LHC experiments. Prompt photons produced in a hard reaction are not accompanied with any final state interaction, either energy loss or absorption. Therefore, in the RHIC energy range besides small isotopic corrections one should not expect any nuclear effects at large p(T). However, data from the PHENIX experiment indicates a significant large-p(T) suppression in d + Au and central Au + Au collisions that cannot be accompanied by coherent phenomena. We demonstrate that such an unexpected result is subject to the energy sharing problem universally induced by multiple initial state interactions (ISI) at large p(T) and/or at forward rapidities. In the LHC kinematic region ISI corrections are irrelevant at mid rapidities but cause rather strong suppression at forward rapidities. We present for the first time predictions for expected nuclear effects at large pT in p + Pb and Pb + Pb collisions at different rapidities. We include and analyze also a contribution of coherent effects associated with gluon shadowing modifying nuclear effects predominantly at small and medium-high p(T)
dcterms:title
Direct photons at large p(T) : from RHIC to LHC Direct photons at large p(T) : from RHIC to LHC
skos:prefLabel
Direct photons at large p(T) : from RHIC to LHC Direct photons at large p(T) : from RHIC to LHC
skos:notation
RIV/68407700:21340/14:00223584!RIV15-MSM-21340___
n3:aktivita
n16:S n16:P n16:Z
n3:aktivity
P(GA13-20841S), P(LG13031), S, Z(MSM6840770039)
n3:dodaniDat
n7:2015
n3:domaciTvurceVysledku
Nemčík, Ján
n3:druhVysledku
n11:D
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
11649
n3:idVysledku
RIV/68407700:21340/14:00223584
n3:jazykVysledku
n6:eng
n3:klicovaSlova
prompt photons; nuclear suppression; ISI corrections; gluon shadowing
n3:klicoveSlovo
n9:nuclear%20suppression n9:gluon%20shadowing n9:prompt%20photons n9:ISI%20corrections
n3:kontrolniKodProRIV
[A6FC89BC990C]
n3:mistoKonaniAkce
Firenze
n3:mistoVydani
Les Ulis Cedex A
n3:nazevZdroje
EPJ Web of Conferences
n3:obor
n17:JB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
2
n3:projekt
n18:LG13031 n18:GA13-20841S
n3:rokUplatneniVysledku
n7:2014
n3:tvurceVysledku
Čepila, Jan Nemčík, Ján
n3:typAkce
n4:WRD
n3:wos
000342463600006
n3:zahajeniAkce
2013-06-02+02:00
n3:zamer
n12:MSM6840770039
s:issn
2101-6275
s:numberOfPages
4
n22:doi
10.1051/epjconf/20146604006
n10:hasPublisher
EDP Sciences
n5:organizacniJednotka
21340