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

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
• Public URL: https://durham-repository.worktribe.com/output/1370707