Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV (Article No. 024908)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F09%3A00206984" target="_blank" >RIV/00216208:11320/09:00206984 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV (Article No. 024908)

Popis výsledku v původním jazyce

We report the observation at of suppression of back-to-back correlations in the direct photon jet channel in Au Au relative to p p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron background. The away-side nuclear suppression factor, I-AA, in central Au Au collisions, is 0.32 /- 0.12(stat) /- 0.09(syst) for hadrons of 3 { p(T)(h){ 5 in coincidence with photons of 5 { p(T)(gamma){ 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement ofthe away-side parton fragmentation function. We compare to Au Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.

Název v anglickém jazyce

Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV (Article No. 024908)

Popis výsledku anglicky

We report the observation at of suppression of back-to-back correlations in the direct photon jet channel in Au Au relative to p p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron background. The away-side nuclear suppression factor, I-AA, in central Au Au collisions, is 0.32 /- 0.12(stat) /- 0.09(syst) for hadrons of 3 { p(T)(h){ 5 in coincidence with photons of 5 { p(T)(gamma){ 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement ofthe away-side parton fragmentation function. We compare to Au Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

<a href="/cs/project/LA08015" target="_blank" >LA08015: Spolupráce ČR s CERN</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2009

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review. C. Nuclear Physics

ISSN

0556-2813

e-ISSN

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Svazek periodika

80

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

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Kód UT WoS článku

000269640400054

EID výsledku v databázi Scopus

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