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.

Approved plots and figures from EXO-12-048

Figure Caption
Feynman diagrams for the pair production of DM particles for the case of a contact interaction (a) and the exchange of a mediator (b).
(a) Download PDF Download JPG
(b) Download PDF Download JPG
Feynman diagrams for the production of a graviton (G) or unparticles (U) in association with a jet.
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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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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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Upper limits on the DM-nucleon cross section, at 90% CL, plotted against DM particle mass and compared with previously published results. (a) limits for the vector and scalar operators from the previous CMS analysis, together with results from the CoGeNT, SIMPLE, COUPP, CDMS, SuperCDMS, XENON100, and LUX collaborations. The solid and hatched yellow contours show the 68% and 90% CL contours respectively for a possible signal from CDMS. (b): limits for the axial-vector operator from the previous CMS analysis, together with results from the SIMPLE, COUPP, Super-K, and IceCube collaborations.
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Download PDF Download JPG
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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LimitComparison_Unparticle_Spin0_19fb.jpg The expected and observed lower limits on the unparticle model parameters ΛU as a function of dU at 95% CL, compared to previous result. The shaded region indicates the side of the curve that is excluded.
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Event displays from EXO-12-048

(click on the event display to get PNG)
Event Details ρφ View ρZ View 3D View
Run 204553

Event 26729384

Monojet candidate event

Monojet_Rho-Phi.png Monojet_Rho-Z.png Monojet_3DTower_AllDet.png
Run 204553

Event 36479045

W(mu+nu) + jets candidate event. The W(mu+nu) + jets events are used to predict the remaining W+jets background in monojet analysis.

W_Rho-Phi.png W_Rho-Z.png W_3DTower_AllDet.png
Run 204564

Event 448966153

Z(mu+mu) + jets candidate event. The Z(mu+mu) + jets events are used to predict the invisible Z background in monojet analysis.

Z_Rho-Phi.png Z_Rho-Z.png Z_3DTower_AllDet.png
Topic attachments
I Attachment History Action Size Date Who Comment
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