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arXiv · 1206.6115

Precision direct photon and W-boson spectra at high p_T and comparison to LHC data

Thomas Becher·Christian Lorentzen·Matthew D. Schwartz
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Abstract

The differential p_T spectrum for vector boson production is computed at next-to-leading fixed order and including the resummation of threshold logarithms at next-to-next-to-leading logarithmic accuracy. A comparison is made to ATLAS data on direct photon and W production at high transverse momentum p_T, finding excellent agreement. The resummation is achieved by factorizing contributions associated with different scales using Soft-Collinear Effective Theory. Each part is then calculated perturbatively and the individual contributions are combined using renormalization group methods. A key advantage of the effective theory framework is that it indicates a set of natural scale choices, in contrast to the fixed-order calculation. Resummation of logarithms of ratios of these scales leads to better agreement with data and reduced theoretical uncertainties.

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Thomas Becher, Christian Lorentzen, Matthew D. Schwartz. 2013-08-07. Precision direct photon and W-boson spectra at high p_T and comparison to LHC data. https://doi.org/10.1103/physrevd.86.054026

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