Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-20
Phys.Rev. D71 (2005) 014013
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 4 figures as epsi, one reference added
Scientific paper
10.1103/PhysRevD.71.014013
We study a class of nonperturbative corrections to single-inclusive photon cross sections at measured transverse momentum p_T, in the large-x_T limit. We develop an extension of the joint (threshold and transverse momentum) resummation formalism, appropriate for large x_T, in which there are no kinematic singularities associated with recoil, and for which matching to fixed order and to threshold resummation at next-to-leading logarithm (NLL) is straightforward. Beyond NLL, we find contributions that can be attributed to recoil from initial state radiation. Associated power corrections occur as inverse powers of p_T^2 and are identified from the infrared structure of integrals over the running coupling. They have significant energy dependence and decrease from typical fixed-target to collider energies. Energy conservation, which is incorporated into joint resummation, moderates the effects of perturbative recoil and power corrections for large x_T.
Sterman George
Vogelsang Werner
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