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Title: 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 $$\gamma+j$$ 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:
 [1] ;  [2] ;  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Univ. of Durham, Durham (United Kingdom)
  3. Univ. at Buffalo The State Univ. of New York, Buffalo, NY (United States)
Publication Date:
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
Type:
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)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1354870
Alternate Identifier(s):
OSTI ID: 1373425