Medium modification of jet fragmentation in Au+Au collisions at â[s(NN)]=200 GeV measured in direct photon-hadron correlations.
Phys Rev Lett
; 111(3): 032301, 2013 Jul 19.
Article
em En
| MEDLINE
| ID: mdl-23909311
ABSTRACT
The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at â[s(NN)]=200 GeV. The p(T) of the photon is an excellent approximation to the initial p(T) of the jet and the ratio z(T)=p(T)(h)/p(T)(γ) 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. I(AA), 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 z(T). The associated hadron yield at low z(T) is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos