Abstract
Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb−1 sample of proton–proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC. Three separate background estimation methods, each relying primarily on control samples in the data, are applied to a range of signal regions, providing complementary approaches for estimating the background yields. The observed yields are consistent with the predicted standard model backgrounds. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model, as well as on cross sections for simplified models, which provide a generic description of the production and decay of new particles in specific, topology based final states.Electronic Supplementary MaterialThe online version of this article (doi:10.1140/epjc/s10052-013-2404-z) contains supplementary material, which is available to authorized users.
Highlights
This paper reports results from an updated and improved search for new physics processes in proton–proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single isolated lepton, multiple energetic jets, and large missing momentum transverse to the beam direction (E/ T)
The yields observed in the signal regions in the data, which are listed at the bottom of each table, are consistent with the total background predictions based on the control samples
We scan over models in the CMSSM and determine whether the number of events predicted at each model point in parameter space can be excluded by the measurements
Summary
This paper reports results from an updated and improved search for new physics processes in proton–proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single isolated lepton (electron or muon), multiple energetic jets, and large missing momentum transverse to the beam direction (E/ T). This signature arises in many SUSY models, including the constrained minimal supersymmetric extension of the standard model (CMSSM) [10, 11], and in simplified models [12,13,14,15], which are based on simplified mass spectra and decays of new particles Both of these frameworks are used to interpret the results. The Lepton Spectrum (LS) method was used in the CMS single-lepton [1] and opposite-sign dilepton [20] SUSY searches performed using the 2010 data sample It uses the observed lepton transverse momentum (pT). Spectrum and other control samples to predict the E/ T distribution associated with the dominant SM backgrounds This method is sensitive to SUSY models in which the E/ T distribution is decoupled from the lepton pT spectrum, as is the case when two undetected LSPs produce a large missing transverse momentum. The results, interpretation, and conclusions of the analysis are presented in Sects. 9 and 10
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