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Search For Supersymmetry At The Lhc In Events With Jets And Missing Transverse Energy
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Book Synopsis Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy by :
Download or read book Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for events with jets and missing transverse energy is performed in a data sample of pp collisions collected at sqrt(s) = 7 TeV by the CMS experiment at the LHC. The analyzed data sample corresponds to an integrated luminosity of 1.14 inverse femtobarns. In this search, a kinematic variable, alphaT, is used as the main discriminator between events with genuine and misreconstructed missing transverse energy. No excess of events over the standard model expectation is found. Exclusion limits in the parameter space of the constrained minimal supersymmetric extension of the standard model are set. In this model, squark masses below 1.1 TeV are excluded at 95% CL. Gluino masses below 1.1 TeV are also ruled out at 95% CL for values of the universal scalar mass parameter below 500 GeV.
Book Synopsis Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector by : Wing Howard To
Download or read book Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector written by Wing Howard To and published by . This book was released on 2013 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for supersymmetry (SUSY) at the Large Hadron Collider using data collected in Run 2011 at center of mass energy of 7 TeV by the Compact Muon Solenoid detector with an integrated luminosity of 4.98 $fb{-1}$. First, the Large Hadron Collider is briefly described along with the Compact Muon Solenoid detector. Second, the Standard Model of particle physics is described which leads to the motivations for supersymmetry and its description. Finally, a search for supersymmetry in events with a single lepton, 2 b-tagged jets and missing transverse energy is documented in detail. The results are used to predict the yields from the standard model in bins missing transverse energy (\met) and total transverse hadronic energy (HT). Limits are set using these results using a minimal supergravity SUSY model and simplified model spectra SUSY model.
Book Synopsis Search for Supersymmetry in Events with B Jets and Missing Transverse Momentum at the LHC. by :
Download or read book Search for Supersymmetry in Events with B Jets and Missing Transverse Momentum at the LHC. written by and published by . This book was released on 2011 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry is presented using a sample of events with b jets and missing transverse momentum. The search uses a data sample of proton-proton collisions at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 35 inverse picobarns, collected with the CMS detector. A total of 0.33 +0.43 -0.33 (stat.) +/- 0.13 (syst.) events is predicted, using control samples in the data, to arise from standard model processes, and one event is observed in the data. Upper limits are set at the 95% confidence level on the cross sections of benchmark supersymmetric models.
Book Synopsis Search for Supersymmetry in Pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy by :
Download or read book Search for Supersymmetry in Pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy written by and published by . This book was released on 2011 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry with R-parity conservation in proton-proton collisions at a centre-of-mass energy of 7 TeV is presented. The data correspond to an integrated luminosity of 35 inverse picobarns collected by the CMS experiment at the LHC. The search is performed in events with jets and significant missing transverse energy, characteristic of the decays of heavy, pair-produced squarks and gluinos. The primary background, from standard model multijet production, is reduced by several orders of magnitude to a negligible level by the application of a set of robust kinematic requirements. With this selection, the data are consistent with the standard model backgrounds, namely t t-bar, W + jet and Z + jet production, which are estimated from data control samples. Limits are set on the parameters of the constrained minimal supersymmetric extension of the standard model. These limits extend those set previously by experiments at the Tevatron and LEP colliders.
Book Synopsis Search for Supersymmetry in Events with Missing Transverse Energy and B-Jets with the ATLAS Detector by : Stefan Winkelmann
Download or read book Search for Supersymmetry in Events with Missing Transverse Energy and B-Jets with the ATLAS Detector written by Stefan Winkelmann and published by . This book was released on 2012 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zusammenfassung: In this thesis, searches for Supersymmetry (SUSY) with the ATLAS detector at the Large Hadron Collider (LHC) at a center-of-mass energy of 7 TeV are presented. The focus lies on two searches for squarks of the third generation, specifically the direct production of stop pairs and the production of stops via the decay of gluinos. The searches are based on experimental signatures with large missing transverse energy, b-quark jets and one electron or muon. The datasets used correspond to an integrated luminosity of 4.7 fb-1 and 2.05 fb-1, respectively. Inclusive observables, which are sensitive to the mass scale of SUSY particles are used to discriminate the signal from the Standard Model (SM) background processes. In both analyses, dedicated background estimation techniques are used. Control samples in data are used to supplement or replace the background estimation from Monte Carlo simulation. No significant excess beyond the SM expectation is found. Therefore, both model independent upper limits on physics beyond the SM are derived and model specific interpretations are given
Book Synopsis A Search for Supersymmetry in Events with Jets and Missing Momentum Using Data Collected by the CMS Detector at 13 TeV by : Sam Daniel Mullin
Download or read book A Search for Supersymmetry in Events with Jets and Missing Momentum Using Data Collected by the CMS Detector at 13 TeV written by Sam Daniel Mullin and published by . This book was released on 2016 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: As successful as the Standard Model of particle physics has been it still has several major shortcomings which range from unanswered theoretical questions to a lack of any explanation for observed phenomena such as dark matter. One proposed theory for physics beyond the Standard Model which provides solutions for some of these issues is supersymmetry. This dissertation presents a search for supersymmetry using 2.3 fb -1 of proton-proton collision data. This data was collected at a center-of-mass energy of 13 TeV by the CMS detector at the LHC during 2015. This search focuses on top squark pair production where the produced stops both decay to an all hadronic final state. These decays are characterized by multiple jets and missing transverse momentum. A baseline search region is defined to be sensitive to signal processes which occur at rates many orders of magnitude lower than Standard Model processes. The sensitivity to various signal models is improved by dividing this baseline region into distinct categories. Events with an unreconstructed lepton from leptonic W boson decays constitute the primary background. There are also significant contributions from events where a Z boson decays invisibly to neutrinos especially in bins with higher missing transverse momentum. Events with multijet production where one jet has been severely mis-measured as well as those with a pair of top quarks and an invisibly decaying Z boson also have a small presence in the search region. The contributions from these processes to the search region is estimated using data control regions. No statistically significant deviations from the predicted background yields are observed. The results are interpreted in terms of exclusion limits using the Simplified Model Spectrum framework. Stop and neutralino masses are probed up to 780 GeV and 260 GeV respectively.
Book Synopsis Search for Supersymmetry in Events with Leptons (e, Μ, Τ), Jets and Missing Transverse Energy with the ATLAS Detector at the LHC. by : Anthony Rose
Download or read book Search for Supersymmetry in Events with Leptons (e, Μ, Τ), Jets and Missing Transverse Energy with the ATLAS Detector at the LHC. written by Anthony Rose and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Supersymmetry in Events with Photons and Jets from Proton-proton Collisions at √s by : Robin James Nandi
Download or read book A Search for Supersymmetry in Events with Photons and Jets from Proton-proton Collisions at √s written by Robin James Nandi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An exclusion of Gauge Mediated Supersymmetry Breaking at 95% confidence level is made in the squark mass vs gluino mass parameter space using 1:1 fb -1 of proton-proton collisions data from the Large Hadron Collider. The event selection is based on the strong production signature of photons, jets and missing transverse energy. Missing transverse energy is used to distinguish signal from background. The background is estimated with a data driven technique. The CLs method is used to exclude models with squark mass and gluino mass up to around 1TeV.
Book Synopsis Search for Supersymmetry in Events with One Lepton and Multiple Jets in Proton-proton Collisions at Sqrt(s) by :
Download or read book Search for Supersymmetry in Events with One Lepton and Multiple Jets in Proton-proton Collisions at Sqrt(s) written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry is performed in events with a single electron or muon in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 2.3 inverse femtobarns. Several exclusive search regions are defined based on the number of jets and b-tagged jets, the scalar sum of the jet transverse momenta, and the scalar sum of the missing transverse momentum and the transverse momentum of the lepton. The observed event yields in data are consistent with the expected backgrounds from standard model processes. The results are interpreted using two simplified models of supersymmetric particle spectra, both of which describe gluino pair production. In the first model, each gluino decays via a three-body process to top quarks and a neutralino, which is associated with the observed missing transverse momentum in the event. Gluinos with masses up to 1.6 TeV are excluded for neutralino masses below 600 GeV. In the second model, each gluino decays via a three-body process to two light quarks and a chargino, which subsequently decays to a W boson and a neutralino. The mass of the chargino is taken to be midway between the gluino and neutralino masses. In this model, gluinos with masses below 1.4 TeV are excluded for neutralino masses below 700 GeV.
Book Synopsis Search for Supersymmetry in Hadronic Final States with Missing Transverse Energy Using the Variables [alpha] T and B-quark Multiplicity in Pp Collisions at $\sqrt{s} by :
Download or read book Search for Supersymmetry in Hadronic Final States with Missing Transverse Energy Using the Variables [alpha] T and B-quark Multiplicity in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2013 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb-1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, [alpha] T, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. Finally, for the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.
Book Synopsis Search for Supersymmetry in 8 TeV Proton-proton Collision Events with Bottom-quark Jets and Missing Transverse Energy by : Benjamin Kreis
Download or read book Search for Supersymmetry in 8 TeV Proton-proton Collision Events with Bottom-quark Jets and Missing Transverse Energy written by Benjamin Kreis and published by . This book was released on 2014 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry in a sample of proton-proton collision events with a center-of-mass energy of 8 TeV is presented. The sample, collected with the Compact Muon Solenoid detector at the Large Hadron Collider, corresponds to an integrated luminosity of 19.4 fb[-]1 . Events are required to have large missing transverse energy, at least three jets, and at least one identified bottom-quark jet. Numbers of events in exclusive bins of the scalar sum of jet transverse momentum values, missing transverse energy, and bottom-quark jet multiplicity are found to be consistent with the standard model expectations. The results are interpreted as 95% confidence level upper limits on simplified supersymmetric models approximating gluino mediated bottom- and top-squark production.
Book Synopsis Search for Supersymmetry in Events with Missing Transverse Energy and B-Jets with the ATLAS Detector by : Stefan Winkelmann
Download or read book Search for Supersymmetry in Events with Missing Transverse Energy and B-Jets with the ATLAS Detector written by Stefan Winkelmann and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Stealth Supersymmetry in Events with Jets, Either Photons Or Leptons, and Low Missing Transverse Momentum in Pp Collisions at 8 TeV. by :
Download or read book Search for Stealth Supersymmetry in Events with Jets, Either Photons Or Leptons, and Low Missing Transverse Momentum in Pp Collisions at 8 TeV. written by and published by . This book was released on 2015 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a search for new physics in final states with jets, either photons or leptons, and low missing transverse momentum are reported. The study is based on a sample of proton-proton collisions collected at a center-of-mass energy View the MathML source with the CMS detector in 2012. The integrated luminosity of the sample is 19.7 fb-1. Many models of new physics predict the production of events with jets, electroweak gauge bosons, and little or no missing transverse momentum. Examples include stealth models of supersymmetry (SUSY), which predict a hidden sector at the electroweak energy scale in which SUSY is approximately conserved. Furthermore, the data are used to search for stealth SUSY signatures in final states with either two photons or an oppositely charged electron and muon. No excess is observed with respect to the standard model expectation, and the results are used to set limits on squark pair production in the stealth SUSY framework.
Book Synopsis Search for New Physics with Long-lived Particles Decaying to Photons and Missing Energy in Pp Collisions at a Center-of-mass Energy of 7 TeV with the CMS Experiment at the LHC by : Hongliang Liu
Download or read book Search for New Physics with Long-lived Particles Decaying to Photons and Missing Energy in Pp Collisions at a Center-of-mass Energy of 7 TeV with the CMS Experiment at the LHC written by Hongliang Liu and published by . This book was released on 2011 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: We perform a search for long-lived neutral particles decaying into a photon and invisible particles in pp collisions at a center-of-mass energy of 7 TeV at the Large Hadron Collider. In the context of gauge mediated supersymmetry with the lightest neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest supersymmetric particle, the neutralino can decay into a gravitino and a photon with a non-zero lifetime. The impact parameter of the photon relative to the beam-beam collision point can be reconstructed using converted photons. The method is sensitive to lifetimes of the order of [Special characters omitted.] (0.1 ns). The data sample corresponds to an integrated luminosity of 2.1 ± 0.1 fb -1 recorded in the first part of 2011 by the CMS experiment at the LHC at [Special characters omitted.] = 7 TeV. The search is performed using events containing photons, missing transverse energy and jets. Upper limits at the 95% confidence level are presented on the cross section for such particles from pair-production, each of which decays into a photon and invisible particles.
Book Synopsis Search for Supersymmetry in the Multijet and Missing Transverse Momentum Final State in Pp Collisions at 13 TeV. by :
Download or read book Search for Supersymmetry in the Multijet and Missing Transverse Momentum Final State in Pp Collisions at 13 TeV. written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new physics is performed based on all-hadronic events with large missing transverse momentum produced in proton-proton collisions at sqrt(s)=13 TeV. The data sample, corresponding to an integrated luminosity of 2.3 inverse femtobarns, was collected with the CMS detector at the CERN LHC in 2015. The data are examined in search regions of jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion limits are presented for simplified supersymmetric models of gluino pair production. Depending on the assumed gluino decay mechanism, and for a massless, weakly interacting, lightest neutralino, lower limits on the gluino mass from 1440 to 1600 GeV are obtained, significantly extending previous limits.
Book Synopsis Search for Supersymmetry in Events with Jets and Missing Energy at the LHC by : Chris Lucas
Download or read book Search for Supersymmetry in Events with Jets and Missing Energy at the LHC written by Chris Lucas and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Supersymmetry with Jets and Missing Transverse Energy at the Large Hadron Collider, and the Performance of the ATLAS Missing Transverse Energy Trigger by : Alexander Vincent Pinder
Download or read book A Search for Supersymmetry with Jets and Missing Transverse Energy at the Large Hadron Collider, and the Performance of the ATLAS Missing Transverse Energy Trigger written by Alexander Vincent Pinder and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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