Scaling Properties of High $p_T$ Inclusive Hadron Production

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We 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{sub T}, the invariant cross section exhibits a power-like behavior Ed{sup 3}{sigma}/d{sup 3}p {proportional_to} p{sub T}{sup -n} at fixed transverse x, x{sub T} = 2|{bar p}{sub T}|/{radical}s, and fixed center-of-mass scattering angle {theta}{sub 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{sub T}. We find that high-p{sub T} hadrons are produced by different mechanisms at fixed-target and collider ... continued below

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14 pages

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Brodsky, S.J.; /SLAC; Pirner, H.J.; Raufeisen, J. & U., /Heidelberg October 26, 2005.

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We 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{sub T}, the invariant cross section exhibits a power-like behavior Ed{sup 3}{sigma}/d{sup 3}p {proportional_to} p{sub T}{sup -n} at fixed transverse x, x{sub T} = 2|{bar p}{sub T}|/{radical}s, and fixed center-of-mass scattering angle {theta}{sub 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{sub T}. We find that high-p{sub 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{sub 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{sub 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.

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14 pages

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  • Report No.: SLAC-PUB-11539
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/878033 | External Link
  • Office of Scientific & Technical Information Report Number: 878033
  • Archival Resource Key: ark:/67531/metadc880393

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  • October 26, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 8:53 p.m.

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Brodsky, S.J.; /SLAC; Pirner, H.J.; Raufeisen, J. & U., /Heidelberg. Scaling Properties of High $p_T$ Inclusive Hadron Production, report, October 26, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc880393/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.