Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-11-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 4 figures. Extended introduction, additional references
Scientific paper
A scaling law analysis of the world data on inclusive large-pT hadron production in hadronic collisions is carried out. A significant deviation from leading-twist perturbative QCD predictions at next-to-leading order is reported. The observed discrepancy is largest at high values of xT=2pT/sqrt(s). In contrast, the production of prompt photons and jets exhibits the scaling behavior which is close to the conformal limit, in agreement with the leading-twist expectation. These results bring evidence for a non-negligible contribution of higher-twist processes in large-pT hadron production in hadronic collisions, where the hadron is produced directly in the hard subprocess rather than by gluon or quark jet fragmentation. Predictions for scaling exponents at RHIC and LHC are given, and it is suggested to trigger the isolated large-pT hadron production to enhance higher-twist processes.
Arleo François
Brodsky Stanley J.
Hwang Dae Sung
Sickles Anne M.
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