Higher-Twist Dynamics in Large transverse Momentum Hadron Production

by Francois Arleo (lapp-Laboratoire d'Annecy-le-Vieux de Physique des Particules-In)

Wednesday 23 Sept 2009, 11:00 → 12:00 Europe/Zurich

TH Theory Conference Room (CERN)

A scaling law analysis of the world data on inclusive large-$p_\perp$ single 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 $x_\perp=2p_\perp/\sqrts$. In contrast, the production of prompt photons and jets exhibits fixed $x_\perp$ scaling behavior 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-$p_\perp$ hadron production in hadronic collisions where the hadron is produced directly in the hard subprocess rather than by gluon or quark jet fragmentation. Phenomenological consequences for RHIC and LHC are discussed in detail. EVO booking information: Title: Heavy ion Forum Community: ALICE Meeting Access Information: - Meeting URL http://evo.caltech.edu/evoGate/koala.jnlp?meeting=vsvivIeneIItIla9a9Itas - Phone Bridge ID: 1228810

Slides hif_arleo.pdf