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

Driving missing data at the LHC: NNLO predictions for the ratio of γ+j and Z+j 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

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

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

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.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.014037
Publisher site
See Article on Publisher Site

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.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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