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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.

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 a Photon, a Lepton, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$

2015
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Release : 2015
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Kind : eBook
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Book Synopsis Search for Supersymmetry with a Photon, a Lepton, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ by :

Download or read book Search for Supersymmetry with a Photon, a Lepton, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Our search for supersymmetry involving events with at least one photon, one electron or muon, and large missing transverse momentum has been performed by the CMS experiment. The data sample corresponds to an integrated luminosity of 19.7 fb-1 of pp collisions at √ s = 8 TeV, produced at the CERN LHC. No excess of events is observed beyond expectations from standard model processes. The result of the search is interpreted in the context of a general model of gauge-mediated supersymmetry breaking, where the charged and neutral winos are the next-to-lightest supersymmetric particles. Within this model, winos with a mass up to 360 GeV are excluded at the 95% confidence level. Also, two simplified models inspired by gauge-mediated supersymmetry breaking are also examined, and used to derive upper limits on the production cross sections of specific supersymmetric processes.

Search for Supersymmetry in Pp Collisions at Sqrt(s)

2011
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Release : 2011
Genre :
Kind : eBook
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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 in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy

2017-06-14 Science
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Release : 2017-06-14
Genre : Science
Kind : eBook
Book Rating : 610/5 ( reviews)

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Book Synopsis Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy by : Yutaro Iiyama

Download or read book Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy written by Yutaro Iiyama. This book was released on 2017-06-14. Available in PDF, EPUB and Kindle. Book excerpt: This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.

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