Combined Search for Supersymmetry with Photons in Proton-proton Collisions at √s
Author: Albert M. Sirunyan
Publisher:
Published: 2019
Total Pages:
ISBN-13:
DOWNLOAD EBOOKPosts
Search for Supersymmetry with Photons in Pp Collisions at $\sqrt{s}$
Author:
Publisher:
Published: 2015
Total Pages:
ISBN-13:
DOWNLOAD EBOOKTwo 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.
A Search for Supersymmetry in Events with Photons and Jets from Proton-proton Collisions at √s
Author: Robin James Nandi
Publisher:
Published: 2012
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAn 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.
A Search for Supersymmetry in Events with Photons and Jets from Proton-proton Collisions at [square Route]s
Author: Robin James Nandi
Publisher:
Published: 2012
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKSearch for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy
Author: Yutaro Iiyama
Publisher: Springer
Published: 2017-06-14
Total Pages: 182
ISBN-13: 3319586610
DOWNLOAD EBOOKThis 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.
Search for Supersymmetry in Events with at Least One Photon and Missing Transverse Momentum in Proton-proton Collisions at a Center-of-mass Energy of 13 TeV at the CMS Experiment
Author: Johannes Schulz
Publisher:
Published: 2018*
Total Pages:
ISBN-13:
DOWNLOAD EBOOKSearch for Long-lived Particles Using Delayed Photons in Proton-proton Collisions at 13 TeV with the CMS Detector
Author: Kevin Patrick McDermott
Publisher:
Published: 2019
Total Pages: 206
ISBN-13:
DOWNLOAD EBOOKThis dissertation presents a search for long-lived particles using delayed photons in proton-proton collisions at sqrt(s) = 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider in 2017, corresponding to an integrated luminosity of 41.5 fb^-1. This analysis includes a number of unique components that will be discussed: a dedicated signal trigger, out-of-time photon reconstruction and identification, and a detector time resolution measurement. The results of this search include the combination of a related analysis using data collected in 2016 also at sqrt(s) = 13 TeV, corresponding to a combined integrated luminosity of 77.4 fb^-1. The combined results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 10^1, 10^2, 10^3, and 10^4 cm, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. Additionally, a discussion on a high-performance computing upgrade to CMS, known as mkFit, will be presented. mkFit is an on-going effort to exploit highly parallel computer architectures in vectorizing and parallelizing combinatorial Kalman filter charged particle track reconstruction algorithms. The current physics and computational performance of this project will be discussed.
Search for Supersymmetry in Events with Photons and Missing Transverse Energy in Pp Collisions at 13 TeV.
Author:
Publisher:
Published: 2016
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThe results of a search for new physics in final states with photons and missing transverse energy are reported. The study is based on a sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 inverse femtobarns. Final states with two photons and significant missing transverse energy are used to search for supersymmetric particles in models of supersymmetry (SUSY) with general gauge-mediated (GGM) supersymmetry breaking. No excess is observed with respect to the standard model expectation, and the results are used to set limits on gluino pair production and squark pair production in the GGM SUSY framework. Gluino masses below 1.65 TeV and squark masses below 1.37 TeV are excluded at a 95% confidence level.
Search for Supersymmetry in Events with at Least One Photon, Missing Transverse Momentum, and Large Transverse Event Activity in Proton-proton Collisions at 13TeV with the CMS Detector in 2016
Author: Maximilian Knut Kiesel
Publisher:
Published: 2018
Total Pages:
ISBN-13:
DOWNLOAD EBOOKSearch for Supersymmetry with a Photon, a Lepton, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$
Author:
Publisher:
Published: 2015
Total Pages: 36
ISBN-13:
DOWNLOAD EBOOKOur 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.
