Naslov
Medium modification of jet fragmentation in Au + Au collisions at sqrt(s_NN)=200 GeV measured in direct photon-hadron correlations

Autori
Adare, A. ; ... ; Makek, Mihael ; ... ; Zolin, L.

Izvornik
Physical Review Letters (0031-9007) 111 (2013); 032301-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Quark-gluon plasma; jet fragmentation; photon-hadron correlations; Au+Au collisions; 200 GeV; PHENIX; RHIC

Sažetak
The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at sNN=200  GeV. The pT of the photon is an excellent approximation to the initial pT of the jet and the ratio zT=pTh/pTγ is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au+Au collisions while a photon isolation cut is applied in p+p. IAA, the ratio of hadron yield opposite the photon in Au+Au to that in p+p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high zT. The associated hadron yield at low zT is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
PHENIX Collaboration.

POVEZANOST RADA