Search for New Physics with a Mono-Jet and Missing Transverse Energy in pp Collisions at sqrt(s) = 7 TeV

TL;DR

A study of events with missing transverse energy and an energetic jet is performed using pp collision data at a center-of-mass energy of 7 TeV, and significant extension of the current limits on parameters of new physics benchmark models is achieved.

Abstract

A study of events with missing transverse energy and an energetic jet is performed using pp collision data at a centre-of-mass energy of 7 TeV. The data were collected by the CMS detector at the LHC, and correspond to an integrated luminosity of 36 inverse picobarns. An excess of these events over standard model contributions is a signature of new physics such as large extra dimensions and unparticles. The number of observed events is in good agreement with the prediction of the standard model, and significant extension of the current limits on parameters of new physics benchmark models is achieved.

Figures (3)

• Figure 1: Distribution of $p_{\mathrm{T}}\xspace(j_1)$, requiring $E_{\mathrm{T}}^{\text{miss}}$$>$ 150$\,\text{Ge\spaceV}$, N$_\textrm{jets}\le 2$, $|\eta(j_1)|\!<\!2.4$, and $\Delta\phi(j_1,j_2)<2$. A representative ADD signal (with ${M_\mathrm{D}}\xspace=2{\,\text{Te\spaceV\space/\space}c^\text{2}}\xspace$, $\delta=2$) is shown as a dashed red line. The background is normalised to the measured rate in data.
• Figure 2: Missing transverse energy $E_{\mathrm{T}}^{\text{miss}}$ after all selection cuts for data, SM background, and an example of ADD signal (${M_\mathrm{D}}\xspace$=2${\,\text{Te\spaceV\space/\space}c^\text{2}}$, $\delta$=2). The figure at right shows the integrated number of events above a given threshold. The background is normalised to the measured rate in data.
• Figure 3: Observed and expected 95% CL lower limits on the allowed region of unparticle model parameters ${d_{U}}\xspace$ and ${\Lambda_{U}}\xspace$, compared to those derived from CDF results bib:INTRO_Delgadobib:INTRO_Kathrein.