Phys. Rev. Lett. 81, 2642–2645 (1998)Evidence for Parton kT Effects in High- pT Particle ProductionReceived 24 November 1997; published in the issue dated 28 September 1998 Inclusive π0 and direct-photon cross sections in the kinematic range 3.5<pT<12GeV/c with central rapidities ( ycm) are presented for 530and800GeV/c proton beams and a 515GeV/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 URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2642
DOI:
10.1103/PhysRevLett.81.2642
PACS:
13.85.Qk, 12.38.Qk, 13.85.Ni, 25.40.Ve
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