Evidence for parton kT effects in high- pT particle production
Journal
Physical Review Letters
Journal Volume
81
Journal Issue
13
Pages
2642-2645
Date Issued
1998
Author(s)
Apanasevich, L. et al. (Fermilab E706 Collaboration)
Abstract
Inclusive π0 and direct-photon cross sections in the kinematic range 3.5 < pT < 12GeV/c with central rapidities (ycm) are presented for 530 and 800 GeV/c proton beams and a 515 GeV/c π− beam incident on Be 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. © 1998 The American Physical Society.
Type
journal article