High p{sub T} hadrons as probes of the central region of Au-Au collisions at {radical}(S{sub NN})=200 GeV
- Department of Physics, P.O. Box 35, University of Jyvaeskylae, FIN-40014, Jyvaeskylae (Finland) and Helsinki Institut of Physics, P.O. Box 64, University of Helsinki, FIN-00014, Helsinki (Finland)
The energy loss of high p{sub T} partons propagating through a hot and dense medium is regarded as a valuable tool to probe the medium created in ultrarelativistic heavy-ion collisions. The angular correlation pattern of hadrons associated with a hard trigger in the region of p{sub T}{approx}1-2 GeV which exhibits a dip in the expected position of the away side jet has given rise to the idea that energy is lost predominantly to propagating collective modes ('Mach cones'). Recent measurements by the STAR Collaboration have shown that for a high p{sub T}>8 GeV trigger the angular pattern of associate hadrons for p{sub T}>4 GeV shows the emergence of the expected away side peak. These dijet events suggest that the away side parton may emerge occasionally without substantial energy loss. Since in such a back-to-back configuration one of the partons may travel through the central region of the fireball, the average in-medium pathlength is substantial and the expected energy loss is not only sensitive to the initial geometry of matter but also to the change of geometry due to expansion. We show that radiative energy loss is able to explain the dijet events provided that the expansion of the medium is taken into account.
- OSTI ID:
- 20863734
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 2; Other Information: DOI: 10.1103/PhysRevC.74.024903; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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