Evidence for Parton kT Effects in High pT Particle Production

Details Evidence for Parton kT Effects in High pT Particle Production Evidence for Parton kT Effects in High pT Particle Production

1997-11-24

arxiv.org/abs/hep-ex/9711017v1

Phys.Rev.Lett.81:2642-2645,1998

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages including 6 pages of figures with captions

Scientific paper

10.1103/PhysRevLett.81.2642

Inclusive pizero and direct-photon cross sections in the kinematic range 3.5 < pT < 12 GeV/c with central rapidities are presented for 530 and 800 GeV/c proton beams and a 515 GeV/c pi- beam incident on beryllium targets. Current Next-to-Leading-Order perturbative QCD calculations fail to adequately describe the data for conventional choices of scales. Kinematic distributions from these hard scattering events provide evidence that the interacting partons carry significant initial-state parton transverse momentum (kT). Incorporating these kT effects phenomenologically greatly improves the agreement between calculations and the measured cross sections.

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