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Title: 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 $$\gamma+j$$ 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 $$p_T$$ 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 $$Z(\to \ell^+\ell^-)+j$$ to $$\gamma+j$$ events as a function of the vector boson transverse momentum at NNLO, a quantity that is used to normalize $$Z(\rightarrow\nu\overline{\nu}) +j$$ 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.

Authors:
; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1354870
Alternate Identifier(s):
OSTI ID: 1373425
Report Number(s):
PPP-17-25; IPPP-17-25; FERMILAB-PUB-17-085-T; arXiv:1703.10109
Journal ID: ISSN 2470-0010; PRVDAQ; 1519996
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Campbell, John M., Ellis, R. Keith, and Williams, Ciaran. Driving missing data at the LHC: NNLO predictions for the ratio of γ+j and Z+j. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.014037.
Campbell, John M., Ellis, R. Keith, & Williams, Ciaran. Driving missing data at the LHC: NNLO predictions for the ratio of γ+j and Z+j. United States. doi:10.1103/PhysRevD.96.014037.
Campbell, John M., Ellis, R. Keith, and Williams, Ciaran. Sat . "Driving missing data at the LHC: NNLO predictions for the ratio of γ+j and Z+j". United States. doi:10.1103/PhysRevD.96.014037. https://www.osti.gov/servlets/purl/1354870.
@article{osti_1354870,
title = {Driving missing data at the LHC: NNLO predictions for the ratio of γ+j and Z+j},
author = {Campbell, John M. and Ellis, R. Keith and Williams, Ciaran},
abstractNote = {In this paper we present a calculation of the $\gamma+j$ 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 $p_T$ 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 $Z(\to \ell^+\ell^-)+j$ to $\gamma+j$ events as a function of the vector boson transverse momentum at NNLO, a quantity that is used to normalize $Z(\rightarrow\nu\overline{\nu}) +j$ 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.},
doi = {10.1103/PhysRevD.96.014037},
journal = {Physical Review D},
number = 1,
volume = 96,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}

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Cited by: 6 works
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