Direct Photon Production at Next-to-Next-to-Leading Order

We present the first calculation of direct photon production at next-to-next-to-leading order (NNLO) accuracy in QCD. For this process, although the final-state cuts mandate only the presence of a single electroweak boson, the underlying kinematics resembles that of a generic vector boson plus jet t...

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Bibliographic Details
Published in:Physical review letters 2017-05, Vol.118 (22), p.222001-222001, Article 222001
Main Authors: Campbell, John M, Ellis, R Keith, Williams, Ciaran
Format: Article
Language:English
Subjects:
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Summary:We present the first calculation of direct photon production at next-to-next-to-leading order (NNLO) accuracy in QCD. For this process, although the final-state cuts mandate only the presence of a single electroweak boson, the underlying kinematics resembles that of a generic vector boson plus jet topology. In order to regulate the infrared singularities present at this order, we use the N-jettiness slicing procedure, applied for the first time to a final state that at the Born level includes colored partons but no required jet. We compare our predictions to ATLAS 8 TeV data and find that the inclusion of the NNLO terms in the perturbative expansion, supplemented by electroweak corrections, provides an excellent description of the data with greatly reduced theoretical uncertainties.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.118.222001