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Search for Supersymmetry in Pp Collisions at Sqrt(s)

2011
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Release : 2011
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Book Synopsis Search for Supersymmetry in Pp Collisions at Sqrt(s) by :

Download or read book Search for Supersymmetry in Pp Collisions at Sqrt(s) written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: Results are reported from a search for physics beyond the standard model in proton-proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single, isolated, high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The data sample comprises an integrated luminosity of 36 inverse picobarns, recorded by the CMS experiment at the LHC. The search is motivated by models of new physics, including supersymmetry. The observed event yields are consistent with standard model backgrounds predicted using control samples obtained from the data. The characteristics of the event sample are consistent with those expected for the production of t t-bar and W +jets events. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model.

Search for Supersymmetry with Photons in Pp Collisions at $\sqrt{s}$

2015
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Release : 2015
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Book Synopsis Search for Supersymmetry with Photons in Pp Collisions at $\sqrt{s}$ by :

Download or read book Search for Supersymmetry with Photons in Pp Collisions at $\sqrt{s}$ written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Two searches for physics beyond the standard model in events containing photons are presented. Our data sample used corresponds to an integrated luminosity of 19.7 fb-1 of proton-proton collisions at √s=8 TeV, collected with the CMS experiment at the CERN LHC. The analyses pursue different inclusive search strategies. One analysis requires at least one photon, at least two jets, and a large amount of transverse momentum imbalance, while the other selects events with at least two photons and at least one jet, and uses the razor variables to search for signal events. The background expected from standard model processes is evaluated mainly from data. These results are interpreted in the context of general gauge-mediated supersymmetry, with the next-to-lightest supersymmetric particle either a bino- or wino-like neutralino, and within simplified model scenarios. Upper limits at the 95% confidence level are obtained for cross sections as functions of the masses of the intermediate supersymmetric particles.

Searches for R-parity-violating Supersymmetry in Pp Collisions at Sqrt(s)

2016
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Release : 2016
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Book Synopsis Searches for R-parity-violating Supersymmetry in Pp Collisions at Sqrt(s) by :

Download or read book Searches for R-parity-violating Supersymmetry in Pp Collisions at Sqrt(s) written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented from searches for R-parity-violating supersymmetry in events produced in pp collisions at sqrt(s)=8 TeV at the LHC. Final states with 0, 1, 2, or multiple leptons are considered independently. The analysis is performed on data collected by the CMS experiment corresponding to an integrated luminosity of 19.5 inverse femtobarns. No excesses of events above the standard model expectations are observed, and 95% confidence level limits are set on supersymmetric particle masses and production cross sections. The results are interpreted in models featuring R-parity-violating decays of the lightest supersymmetric particle, which in the studied scenarios can be either the gluino, a bottom squark, or a neutralino. In a gluino pair production model with baryon number violation, gluinos with a mass less than 0.98 and 1.03 TeV are excluded, by analyses in a fully hadronic and one-lepton final state, respectively. An analysis in a dilepton final state is used to exclude bottom squarks with masses less than 307 GeV in a model considering bottom squark pair production. Multilepton final states are considered in the context of either strong or electroweak production of superpartners, and are used to set limits on the masses of the lightest supersymmetric particles. These limits range from 300 to 900 GeV in models with leptonic and up to approximately 700 GeV in models with semileptonic R-parity-violating couplings.

Search for Supersymmetry in Events with a Lepton, a Photon, and Large Missing Transverse Energy in Pp Collisions at Sqrt(s)

2011
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Release : 2011
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Book Synopsis Search for Supersymmetry in Events with a Lepton, a Photon, and Large Missing Transverse Energy in Pp Collisions at Sqrt(s) by :

Download or read book Search for Supersymmetry in Events with a Lepton, a Photon, and Large Missing Transverse Energy in Pp Collisions at Sqrt(s) written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: A search is performed for an excess of events, over the standard model expectations, with a photon, a lepton, and large missing transverse energy in pp collisions at sqrt(s) = 7 TeV. Such events are expected in many new physics models, in particular a supersymmetric theory that is broken via a gauge-mediated mechanism, when the lightest charged and neutral gauginos are mass degenerate. The data sample used in this search corresponds to an integrated luminosity of 35 inverse picobarns collected with the CMS detector at the LHC. No evidence of such an excess above the standard model backgrounds, dominated by W-gamma production, is found. The results are presented as 95% confidence level upper limits on the cross section for a benchmark gauge-mediated scenario, and are then converted into exclusion limits on the squark, gluino, and wino masses.

Search for Supersymmetry with B-quark Jets and Missing Transverse Energy in Pp Collisions at Sqrt(S)

2013
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Release : 2013
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Book Synopsis Search for Supersymmetry with B-quark Jets and Missing Transverse Energy in Pp Collisions at Sqrt(S) by : Wee Don Teo

Download or read book Search for Supersymmetry with B-quark Jets and Missing Transverse Energy in Pp Collisions at Sqrt(S) written by Wee Don Teo. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: Miss We present a search for supersymmetry in events with large ET, no leptons, at least three jets, and one or more b-quark jets. We use a data sample corre[SQUARE ROOT] sponding to 4.98 fb[-]1 of proton-proton collisions at s = 7 TeV collected by the CMS experiment in 2011. The primary sources of standard model background are evaluated using data-driven techniques. We find good agreement between the data and the sum of the background predictions. The results are used to constrain the cross sections for the production of b-quark-enriched final states in the context of supersymmetric models.

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