Driving missing data at the LHC: NNLO predictions for the ratio of γ + j and Z + j

Campbell, John M.; Ellis, R. Keith; Williams, Ciaran

doi:10.1103/physrevd.96.014037

Driving missing data at the LHC: NNLO predictions for the ratio of γ + j and Z + j

Campbell, John M.; Ellis, R. Keith; Williams, Ciaran

Authors

John M. Campbell

Professor Keith Ellis keith.ellis@durham.ac.uk
Emeritus Professor

Ciaran Williams

Abstract

In this paper, we present a calculation of the γ+j process at next-to-next-to-leading order (NNLO) in QCD and compare the resulting predictions to 8 TeV CMS data. We find good agreement with the shape of the photon pT spectrum, particularly after the inclusion of additional electroweak corrections, but there is a tension between the overall normalization of the theoretical prediction and the measurement. We use our results to compute the ratio of Z(→ℓ+ℓ−)+j to γ+j events as a function of the vector boson transverse momentum at NNLO, a quantity that is used to normalize Z(→νν¯)+j backgrounds in searches for dark matter and supersymmetry. Our NNLO calculation significantly reduces the theoretical uncertainty on this ratio, thus boosting its power for future searches of new physics.

Citation

Campbell, J. M., Ellis, R. K., & Williams, C. (2017). Driving missing data at the LHC: NNLO predictions for the ratio of γ + j and Z + j. Physical Review D, 96(1), Article 014037. https://doi.org/10.1103/physrevd.96.014037

Journal Article Type	Article
Acceptance Date	Apr 20, 2017
Online Publication Date	Jul 31, 2017
Publication Date	Jul 31, 2017
Deposit Date	Aug 23, 2017
Publicly Available Date	Aug 23, 2017
Journal	Physical Review D
Print ISSN	2470-0010
Electronic ISSN	2470-0029
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	96
Issue	1
Article Number	014037
DOI	https://doi.org/10.1103/physrevd.96.014037

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