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We study the resummation of large logarithmic perturbative corrections to thepartonic cross sections relevant for the process pp->gamma X at high transversemomentum of the photon.These corrections arise near the threshold for thepartonic reaction and are associated with soft-gluon emission. We especiallyfocus on the resummation effects for the contribution to the cross sectionwhere the photon is produced in jet fragmentation. Previous calculations inperturbation theory at fixed-order have established that this contribution is asubdominant part of the cross section. We find, however, that it is subject tomuch larger resummation effects than the direct (non-fragmentation) piece andtherefore appears to be a significant contribution in the fixed-target regime,not much suppressed with respect to the direct part. Inclusion of thresholdresummation for the fragmentation piece leads to some improvement incomparisons between theoretical calculations and experimental data.Comment: 12 pages, 5 figure

Threshold resummation for the prompt-photon cross section revisited