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High Energy Physics - Phenomenology

arXiv:hep-ph/0409234 (hep-ph)
[Submitted on 20 Sep 2004 (v1), last revised 23 Sep 2004 (this version, v2)]

Title:Recoil and Power Corrections in High-x_T Direct-Photon Production

Authors:George Sterman (Stony Brook), Werner Vogelsang (BNL)
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Abstract: 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.
Comments: 22 pages, 4 figures as epsi, one reference added
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: BNL-NT-04/28, RBRC-432, YITP-SB-04-44
Cite as: arXiv:hep-ph/0409234
  (or arXiv:hep-ph/0409234v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0409234
Journal reference: Phys.Rev.D71:014013,2005
Related DOI: https://doi.org/10.1103/PhysRevD.71.014013

Submission history

From: Werner Vogelsang [view email]
[v1] Mon, 20 Sep 2004 18:54:49 UTC (81 KB)
[v2] Thu, 23 Sep 2004 15:08:56 UTC (81 KB)
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