Longitudinally polarized photoproduction of heavy flavors at next-to-leading order of QCD

被引：3
作者：
Riedl, Johann [1 ]
Stratmann, Marco [2 ]
Schaefer, Andreas [1 ]
机构：
[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
来源：
EUROPEAN PHYSICAL JOURNAL C | 2013年 / 73卷 / 03期
关键词：
PARTON DISTRIBUTIONS; QUARK CORRELATIONS; PHOTON; RENORMALIZATION; HADRONS;
D O I：
10.1140/epjc/s10052-013-2360-7
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We present a phenomenological study of charm quark photoproduction in longitudinally polarized lepton-hadron collisions at next-to-leading order accuracy of QCD. Our results are based on a recently developed, flexible parton-level Monte Carlo program for spin-dependent heavy flavor hadroproduction, which we extend to deal also with both direct and resolved photon contributions. The subsequent hadronization into charmed mesons is modeled in our calculations, which allows us to compare with data on double-spin asymmetries for D-0 meson production taken by the COMPASS collaboration. In general, next-to-leading order QCD corrections are found to be very significant and do not cancel in spin asymmetries. We elucidate the role of the individual hard scattering subprocesses and determine the range of parton momentum fractions predominantly probed for charm production at COMPASS. Theoretical uncertainties are estimated by varying renormalization and factorization scales and parameters controlling the hadronization of the charm quarks.
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页码：1 / 12
页数：12
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