## Higher-Twist Dynamics in Large Transverse Momentum Hadron Production

Who: Francois Arleo (Annecy, LAPTH)
When: Monday, April 12, 2010 at 14:15
Where: The CP³ meeting room

A scaling law analysis of the world data on inclusive large-pT 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 xT. In contrast, the production of prompt photons and jets exhibits fixed xT-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-pT 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 in p-p and heavy ion collisions are discussed in detail.

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