Difference: PhysicsResultsEXO12048 (33 vs. 34)

Revision 342014-09-02 - PhatSrimanobhas

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META TOPICPARENT name="HcalRocMonoJet2012"

Search for new physics in monojet events in pp collisions at sqrt(s) = 8 TeV

Abstract

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 19.7 fb-1 at a centre-of-mass energy of 8 TeV. 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 ADD model of large extra dimensions, and on the unparticle model parameter ΛU. 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.
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Approved plots and figures from EXO-12-048

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Approved plots, figures, and diagrams from EXO-12-048

 
Figure Caption
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Download PDF Download JPG
Download PDF Download JPG
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Missing transverse energy (MET) after all selections for data and SM backgrounds. The processes contributing to the SM background are from simulation, normalised to the estimation from data using the MET threshold of 500 GeV. The shaded bands in the lower panel represent the statistical uncertainty. Overflow events are included in the last bin.
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Missing transverse energy (MET) after all selections for data and SM backgrounds. The processes contributing to the SM background are from simulation, normalised to the estimation from data using the MET threshold of 500 GeV. The shaded bands in the lower panel represent the statistical uncertainty. Overflow events are included in the last bin.
 
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The model-independent observed and expected 95% CL upper limits on the visible cross section times acceptance times efficiency (σ × A × ε) for non-SM production of events. Shaded areas show the ±1σ and ±2σ bands on the expected limits.
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Download PDF Download JPG
Download PDF Download JPG
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SpinDependent_shade.jpg Observed limits on the mediator mass divided by coupling, M/√gχgq, as a function of the mass of the mediator, M, assuming vector interactions and a dark matter mass of 50 GeV (blue, filled) and 500 GeV (red, hatched). The width, Γ, of the mediator is varied between M/3 and M/8π. The dashed lines show contours of constant coupling √gχgq.
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SpinDependent_shade.jpg Observed limits on the mediator mass divided by coupling, M/√gχgq, as a function of the mass of the mediator, M, assuming vector interactions and a dark matter mass of 50 GeV (blue, filled) and 500 GeV (red, hatched). The width, Γ, of the mediator is varied between M/3 and M/8π. The dashed lines show contours of constant coupling √gχgq.
 
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ADD_2012_LimitComparison.jpg Lower limits at 95% CL on MD plotted against the number of extra dimensions δ, with results from the ATLAS, CMS, LEP, CDF, and DŲ collaborations.
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