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Title: Search for dark matter, extra dimensions, and unparticles in monojet events in proton-proton collisions at $$\sqrt{s} = 8$$ TeV

Our results are presented from a search for particle dark matter (DM), extra dimensions, and unparticles using events containing a jet and an imbalance in transverse momentum. The data were collected by the CMS detector in proton–proton collisions at the LHC and correspond to an integrated luminosity of 19.7fb-1 at a centre-of-mass energy of 8TeV. The number of observed events is found to be consistent with the standard model prediction. Limits are placed on the DM-nucleon scattering cross section as a function of the DM particle mass for spin-dependent and spin-independent interactions. Limits are also placed on the scale parameter MD in the Arkani-Hamed, Dimopoulos, and Dvali (ADD) model of large extra dimensions, and on the unparticle model parameter ΛU. Finally, the constraints on ADD models and unparticles are the most stringent limits in this channel and those on the DM-nucleon scattering cross section are an improvement over previous collider results.
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
OSTI Identifier:
1234843
Report Number(s):
FERMILAB-PUB--14-317-CMS; CERN-PH-EP--2014-164; CMS-EXO--12-048
Journal ID: ISSN 1434-6052; arXiv eprint number arXiv:1408.3583
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
European physical journal. C, Particles and fields (Online)
Additional Journal Information:
Journal Name: European physical journal. C, Particles and fields (Online); Journal Volume: 75; Journal Issue: 5; Journal ID: ISSN 1434-6052
Publisher:
Springer
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS