Effects of Parton kt in High-pt Particle Production
Abstract
Description
We report on recent work concerning the phenomenology of initial-state parton-kt effects in direct-photon production and related processes in hadron collisions. After a brief summary of a kt-smearing model, we present a study of recent results on fixed-target and collider direct-photon production, using complementary data on diphoton and pion production that provide empirical guidance on the required amount of kt broadening. This approach provides a consistent description of the observed deviations of next-to-leading order QCD calculations relative to the inclusive direct-photon and pizero data. We also comment on the implications of these results for the extraction of the gluon distribution of the nucleon.
Talk given at Hadron Structure '98, Stara Lesna, September 7-13, 1998; to be published in the conference Proceedings. The submission contains a LaTeX source file for the text of the paper, two style files (hsproc.sty and art10.sty) and 11 postscript files with figures; the package is tarred, gzipped and uuencoded (and can be unpacked on a Unix system by "csh file.uu")
Talk given at Hadron Structure '98, Stara Lesna, September 7-13, 1998; to be published in the conference Proceedings. The submission contains a LaTeX source file for the text of the paper, two style files (hsproc.sty and art10.sty) and 11 postscript files with figures; the package is tarred, gzipped and uuencoded (and can be unpacked on a Unix system by "csh file.uu")