Scaling properties of high p_T inclusive hadron production

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dc.creatorBrodsky, S. J.
dc.creatorPirner, H. J.
dc.creatorRaufeisen, J.
dc.date2005-10-24
dc.date2005-12-21
dc.date.accessioned2026-07-07T11:04:50Z
dc.date.available2026-07-07T11:04:50Z
dc.descriptionWe analyze the scaling properties of inclusive hadron production in proton-proton and in heavy ion collisions from fixed target to collider energies. At large transverse momentum p_T, the invariant cross section exhibits a power-like behavior Ed^3σ/d^3p\propto p_T^{-n} at fixed transverse x, x_T=2p_T/\sqrt{s}, and fixed center-of-mass scattering angle θ_{cm}. Knowledge of the exponent n allows one to draw conclusions about the production mechanisms of hadrons, which are poorly known, even at high p_T. We find that high-p_T hadrons are produced by different mechanisms at fixed-target and collider energies. For pions, higher-twist subprocesses where the pion is produced directly dominate at fixed target energy, while leading-twist partonic scattering plus fragmentation is the most important mechanism at collider energies. High-p_T baryons on the other hand appear to be produced by higher-twist mechanisms at all available energies. The higher-twist mechanism of direct proton production can be verified experimentally by testing whether high p_T protons are produced as single hadrons without accompanying secondaries. In addition, we find that medium-induced gluon radiation in heavy ion collisions can violate scaling.
dc.description14 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0510315
dc.identifierhttp://arxiv.org/abs/hep-ph/0510315
dc.identifierPhys.Lett.B637:58-63,2006
dc.identifierdoi:10.1016/j.physletb.2006.03.079
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189030
dc.subjectHigh Energy Physics - Phenomenology
dc.titleScaling properties of high p_T inclusive hadron production
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