Direct Photon Production With Effective Field Theory

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Direct Photon Production With Effective Field Theory

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Title: Direct Photon Production With Effective Field Theory
Author: Becher, Thomas; Schwartz, Matthew D

Note: Order does not necessarily reflect citation order of authors.

Citation: Becher, Thomas and Matthew D. Schwartz. 2010. Direct photon production with effective field theory. Journal of High Energy Physics 2010(2): 40.
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Abstract: The production of hard photons in hadronic collisions is studied using Soft-Collinear Effective Theory (SCET). This is the first application of SCET to a physical, observable cross section involving energetic partons in more than two directions. A factorization formula is derived which involves a non-trivial interplay of the angular dependence in the hard and soft functions, both quark and gluon jet functions, and multiple partonic channels. The relevant hard, jet and soft functions are computed to one loop and their anomalous dimensions are determined to three loops. The final resummed inclusive direct photon distribution is valid to next-to-next-to-leading logarithmic order (NNLL), one order beyond previous work. The result is improved by including non-logarithmic terms and photon isolation cuts through matching, and compared to Tevatron data and to fixed order results at the Tevatron and the LHC. The resummed cross section has a significantly smaller theoretical uncertainty than the next-to-leading fixed-order result, particularly at high transverse momentum.
Published Version: doi:10.1007/JHEP02(2010)040
Other Sources: http://arxiv.org/abs/0911.0681
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8063803

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  • FAS Scholarly Articles [7362]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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