Evidence for Parton {ital k}{sub {ital T}} Effects in High-{ital p}{sub {ital T}} Particle Production
- University of California-Davis, Davis, California 95616 (United States)
- University of Delhi, Delhi, (India) 110007
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- Michigan State University, East Lansing, Michigan 48824 (United States)
- Northeastern University, Boston, Massachusetts 02115 (United States)
- University of Oklahoma, Norman, Oklahoma 73019 (United States)
- Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
- University of Rochester, Rochester, New York 14627 (United States)
Inclusive {pi}{sup 0} and direct-photon cross sections in the kinematic range 3.5{lt}p{sub T}{lt}12 GeV/c with central rapidities (thinspy{sub cm} ) are presented for 530 and 800 GeV/c proton beams and a 515 GeV/c {pi}{sup {minus}} 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 (k{sub T} ). Incorporating these k{sub T} effects phenomenologically greatly improves the agreement between calculations and the measured cross sections. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 664883
- Journal Information:
- Physical Review Letters, Vol. 81, Issue 13; Other Information: PBD: Sep 1998
- Country of Publication:
- United States
- Language:
- English
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