Search for new phenomena with the monojet and missing transverse momentum signature using the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions

Abstract

A search for new phenomena in events featuring a high energy jet and large missing transverse momentum in proton-proton collisions at sqrt(s) = 7 TeV is presented using a dataset corresponding to an integrated luminosity of 33 pb^-1 recorded with the ATLAS detector at the Large Hadron Collider. The number of observed events is consistent with the Standard Model prediction and this result is interpreted in terms of limits on a model of Large Extra Dimensions.

Figures (5)

• Figure 1: Observed number of events (black circles) in the muon control sample compared to the sum of the different W/Z plus jets predictions (squares) as a function of the highest jet $p_{\mathrm{T}}$ threshold, in events with no second-leading jet with $p_{\mathrm{T}} > 60$ GeV. The band indicates the total systematic uncertainty on the MC prediction.
• Figure 2: Observed number of events (black circles) in the electron control sample compared to the sum of the different W/Z plus jets predictions (squares) as a function of the highest jet $p_{\mathrm{T}}$ threshold, in events with no second-leading jet with $p_{\mathrm{T}} > 60$ GeV. The band indicates the total uncertainty on the MC prediction.
• Figure 3: Measured $E_{\mathrm{T}}^{\mathrm{miss}}$ distributions for the ${\mathsf{LowPt}}$ (top) and ${\mathsf{HighPt}}$ (bottom) analyses compared to background predictions. Only statistical uncertainties on the data are shown. The systematic uncertainties on the total number of predicted events are 9% for the ${\mathsf{LowPt}}$ region and 12% for the ${\mathsf{HighPt}}$ region.
• Figure 4: Measured leading-jet $p_{\mathrm{T}}$ distributions for the ${\mathsf{LowPt}}$ (top) and ${\mathsf{HighPt}}$ (bottom) analyses compared to background predictions. Only statistical uncertainties on the data are shown. The systematic uncertainties on the total number of predicted events are 9% for the ${\mathsf{LowPt}}$ region and 12% for the ${\mathsf{HighPt}}$ region.
• Figure 5: Left: Signal cross section times acceptance as a function of $M_D$ predicted by the effective ADD theory for 2 and 4 extra dimensions. The bands surrounding the curves reflect the systematic uncertainties. The observed limit is shown as a dashed line. Right: 95% CL observed lower limits on $M_D$ for different numbers of extra dimensions for ATLAS, CDF CDFadd:08, and LEP LEPadd:04ALEPHadd:03DELPHIadd:05OPALadd:2000L3add:04.