Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-04-30
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at the Mini-Workshop "Strongly Coupled Quark-Gluon Plasma: SPS, RHIC and LHC", Nagoya, Japan, 16-18 February 2007
Scientific paper
Hard processes leading to high transverse momentum hadron production are calculable in perturbative Quantum Chromodynamics (pQCD) for proton-proton collisions. In heavy-ion collisions, such processes occur as well, and due to a separation of scales are calculable on the level of the production of high p_T partons. These subsequently interact with the medium which originates from semi-hard and soft processes in the same collision before they hadronize. The presence of the medium thus modifies the momentum spectrum of outgoing partons and thus hard hadrons. The idea of jet tomography is to study this modification in order to learn about the medium density distribution. While this is a compelling idea, its practical application encounters some difficulties. In this paper, the capability of various observables to provide tomographic information about the medium is discussed and compared.
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