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Title: Next-to-leading order QCD predictions for the signal of dark matter and photon associated production at the LHC

Abstract

We study the potential of the LHC to discover the signal of dark matter associated production with a photon induced by a dimension six effective operator, including next-to-leading order QCD corrections. We investigate the main backgrounds from the standard model, i.e. Z boson and a photon associated production with invisible decay of Z boson, and Z boson and a jet production with the jet misidentified as a photon. We find that the p{sub T}{sup {gamma}} distributions of the backgrounds decrease faster than that of the signal with increasing of the transverse momentum of the photon. The {eta}{sup {gamma}} distributions of the backgrounds are almost flat in the full range of {eta}{sup {gamma}}. In contrast, the signal lies mainly in the central region of {eta}{sup {gamma}}. These characteristics may help to select the events in experiments. We show that in the parameter space allowed by the relic abundance constraint, which we have calculated at the next-to-leading-order QCD level, the LHC with {radical}(S)=7 TeV may discover this signal at the 5{sigma} level after collecting an integrated luminosity of 1 fb{sup -1}. On the other hand, if this signal is not observed at the LHC, we can set a lower limit on themore » new physics scale at the 3{sigma} level.« less

Authors:
; ;  [1];  [1];  [2]
  1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871 (China)
  2. (China)
Publication Date:
OSTI Identifier:
21607814
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 84; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.84.075011; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; CORRECTIONS; DISTRIBUTION; LUMINOSITY; NONLUMINOUS MATTER; PARTICLE DECAY; PHOTONS; QUANTUM CHROMODYNAMICS; STANDARD MODEL; TEV RANGE 01-10; TRANSVERSE MOMENTUM; Z NEUTRAL BOSONS; ACCELERATORS; BOSONS; CYCLIC ACCELERATORS; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FIELD THEORIES; GRAND UNIFIED THEORY; INTERMEDIATE BOSONS; INTERMEDIATE VECTOR BOSONS; LINEAR MOMENTUM; MASSLESS PARTICLES; MATHEMATICAL MODELS; MATTER; OPTICAL PROPERTIES; PARTICLE MODELS; PHYSICAL PROPERTIES; QUANTUM FIELD THEORY; STORAGE RINGS; SYNCHROTRONS; TEV RANGE; UNIFIED GAUGE MODELS

Citation Formats

Wang Jian, Shao Dingyu, Zhang Hao, Li Chongsheng, and Center for High Energy Physics, Peking University, Beijing, 100871. Next-to-leading order QCD predictions for the signal of dark matter and photon associated production at the LHC. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.075011.
Wang Jian, Shao Dingyu, Zhang Hao, Li Chongsheng, & Center for High Energy Physics, Peking University, Beijing, 100871. Next-to-leading order QCD predictions for the signal of dark matter and photon associated production at the LHC. United States. doi:10.1103/PHYSREVD.84.075011.
Wang Jian, Shao Dingyu, Zhang Hao, Li Chongsheng, and Center for High Energy Physics, Peking University, Beijing, 100871. Sat . "Next-to-leading order QCD predictions for the signal of dark matter and photon associated production at the LHC". United States. doi:10.1103/PHYSREVD.84.075011.
@article{osti_21607814,
title = {Next-to-leading order QCD predictions for the signal of dark matter and photon associated production at the LHC},
author = {Wang Jian and Shao Dingyu and Zhang Hao and Li Chongsheng and Center for High Energy Physics, Peking University, Beijing, 100871},
abstractNote = {We study the potential of the LHC to discover the signal of dark matter associated production with a photon induced by a dimension six effective operator, including next-to-leading order QCD corrections. We investigate the main backgrounds from the standard model, i.e. Z boson and a photon associated production with invisible decay of Z boson, and Z boson and a jet production with the jet misidentified as a photon. We find that the p{sub T}{sup {gamma}} distributions of the backgrounds decrease faster than that of the signal with increasing of the transverse momentum of the photon. The {eta}{sup {gamma}} distributions of the backgrounds are almost flat in the full range of {eta}{sup {gamma}}. In contrast, the signal lies mainly in the central region of {eta}{sup {gamma}}. These characteristics may help to select the events in experiments. We show that in the parameter space allowed by the relic abundance constraint, which we have calculated at the next-to-leading-order QCD level, the LHC with {radical}(S)=7 TeV may discover this signal at the 5{sigma} level after collecting an integrated luminosity of 1 fb{sup -1}. On the other hand, if this signal is not observed at the LHC, we can set a lower limit on the new physics scale at the 3{sigma} level.},
doi = {10.1103/PHYSREVD.84.075011},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}