1,142 research outputs found

    Search for supersymmetry in the multijet and missing transverse momentum final state: an analysis performed on 2.3 fb‚ąí1^{-1} of 13 TeV pp collision data collected with the CMS detector

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    We present results from a generic search for strongly produced supersymmetric particles in pp collisions in the multijet + missing transverse momentum final state. The data sample corresponds to 2.3 fb‚ąí1^{-1} recorded by the CMS experiment at s=13\sqrt{s}=13 TeV. This search is motivated by supersymmetry (SUSY) models that avoid fine-tuning of the higgs mass. In such models, certain strongly produced SUSY particles, including the gluino and top squark, are predicted to have masses on the order of a TeV. These particles also have some of the highest production cross sections in SUSY and give rise to final states with distinct, high jet multiplicity event signatures. To make the analysis sensitive to a wide range of such final states, events are classified by the number of jets, the scalar sum of the transverse momenta of the jets, the vector sum of the transverse momenta of the jets, and the number of b-tagged jets. No significant excess is observed beyond the standard model (SM) expectation. The results are interpreted as limits on simplified SUSY models. In these models, gluino masses as high as 1600 GeV are excluded at 95\% CL for scenarios with low Ōá~10\tilde{\chi}_{1}^{0} mass, exceeding the most stringent limits set in by CMS at s=8\sqrt{s}=8 TeV by more than 200 GeV in several simplified models.Comment: Presented at 51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 12 - 19 Mar 201

    Differential cross section measurements for the production of a W boson in association with jets in proton‚Äďproton collisions at ‚ąös = 7 TeV

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    Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript ‚ąí1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

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