INVESTIGADORES
DE FLORIAN daniel Enrique
artículos
Título:
Threshold Resummation for the Prompt-Photon Cross-Section Revisited
Autor/es:
DANIEL DE FLORIAN; WERNER VOGELSANG
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
American Physical Society
Referencias:
Año: 2005 vol. 72 p. 1 - 1
ISSN:
0556-2821
Resumen:
We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for the process pp to gamma at high transverse momentum of the photon. These corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We especially focus on the resummation effects for the contribution to the cross section where the photon is produced in jet fragmentation. Previous calculations in perturbation theory at fixed order have established that this contribution is a subdominant part of the cross section. We find, however, that it is subject to much larger resummation effects than the direct (nonfragmentation) piece and therefore appears to be a significant contribution in the fixed-target regime, not much suppressed with respect to the direct part. Inclusion of threshold resummation for the fragmentation piece leads to some improvement in comparisons between theoretical calculations and experimental data.