Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session B09: Supersymmetry Searches and Models |
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Sponsoring Units: DPF Chair: Tao Han, University of Pittsburgh Room: A111 |
Saturday, April 14, 2018 10:45AM - 10:57AM |
B09.00001: Search for low mass three-jet resonances at the Compact Muon Solenoid Hannah Glaser, Amitabh Lath, Eva Halkiadakis, Yuri Gershtein, Elliot Hughes, Abhijith Gandrakota The Standard Model of physics describes everything we currently know about fundamental particles and their interactions, however it is not complete. One approach used in the search for new physics is to perform an analysis on experimental data which would be sensitive to a ``supersymmetric partner'' to a known particle. This new particle would possess the same properties as one from Standard Model, save for its mass and its spin, which would be off by \textonehalf . The gluon is a Standard Model particle that is both a carrier of and a participant in the Strong Force. A theoretical partner to the gluon, the ``gluino,'' would decay to three quarks observed as a three-jet resonance in the detector, making it a viable target for multi-jet analysis. This work applies the techniques of this approach to a lower mass range than has yet been examined to determine whether they can successfully be used at this scale. The data used in this study came from 13 TeV proton-proton collisions produced by the Large Hadron Collider (LHC) in Geneva, Switzerland and collected by the Compact Muon Solenoid (CMS) detector. [Preview Abstract] |
Saturday, April 14, 2018 10:57AM - 11:09AM |
B09.00002: Search for long-lived particles with multijet displaced vertices in proton-proton collisions at sqrt(s)=13 TeV Jennifer Chu Results are reported from a search for long-lived exotic particles in proton-proton collision events collected by the CMS experiment at a center-of-mass energy of $\sqrt{s}=13$~TeV. The data sample, which was collected during 2015 and 2016, corresponds to an integrated luminosity of 38.5~fb$^{-1}$. This search uses benchmark signal models in which long-lived neutralinos or gluinos are pair-produced and each decay into two or more quarks, leading to a signal with multiple jets and two displaced vertices composed of many tracks. No events with two well-separated high-track-multiplicity vertices are observed, and limits are placed on the pair production cross section as a function of mass and lifetime of the long-lived particle. At 95\% confidence level, the analysis excludes cross sections above approximately 0.3~fb for neutralinos or gluinos with mass between 800 and 2600~GeV and mean proper decay length between 1 and 40~mm. Gluino masses are excluded below 2200~GeV for mean proper decay lengths between 0.8 and 80~mm. [Preview Abstract] |
Saturday, April 14, 2018 11:09AM - 11:21AM |
B09.00003: Search for Displaced Leptons in Proton-Proton Collisions at $\sqrt{s}$ = 13 TeV Bryan Cardwell We present the status of a search for long-lived particles decaying to leptons using 13 TeV center-of-mass energy proton-proton collisions produced at the LHC. The final state of interest includes at least one electron and at least one muon, each having a transverse impact parameter greater than 200 microns. To maximize generality, no requirements are placed on any other final state objects. We present the expected sensitivity of this search to stop quark mass and lifetime using data collected by the CMS detector in 2016 corresponding to an integrated luminosity of 16.1 /fb. [Preview Abstract] |
Saturday, April 14, 2018 11:21AM - 11:33AM |
B09.00004: Search for resonance in inclusive and b-tagged dijet mass spectra in proton-proton collision at √s = 13 TeV Zhixing Wang, Federico De Guio, sungwon lee We present the status of the search for heavy resonance decaying into dijet (bb & bg) final state, with full 2016 data using high-mass data, whose resonance mass is beyond 1.6TeV, by applying btag algorithm. This search is performed using data corresponding to an integrated luminosity of 35.9 $fb^-1$ from proton-proton collision at $\surd$s= = 13 TeV [Preview Abstract] |
Saturday, April 14, 2018 11:33AM - 11:45AM |
B09.00005: Search for new physics with dijet angular distributions in proton-proton collisions at $\sqrt{s} = 13$ TeV at CMS Jingyu Zhang This presentation is based on the analysis of searching for new physics with dijet angular distributions in proton-proton collisions at $\sqrt{s} = 13$ TeV. The data collected with the CMS detector at the CERN LHC correspond to an integrated luminosity of 36 $\rm fb^{-1}$. A measurement of dijet angular distributions, unfolded for detector effects, will be presented. The measured distributions will be compared to predictions from QCD and various new physics models. Limits on the new physics models will be discussed. [Preview Abstract] |
Saturday, April 14, 2018 11:45AM - 11:57AM |
B09.00006: Estimation of the Z Invisible Background for Searches for Supersymmetry in the All-Hadronic Channel Andres Abreu Results for the search of Supersymmetry in the all-hadronic channel will be presented with an emphasis on the irreducible Z Invisible background. The procedure for estimating the Z Invisible background consists of a hybrid method composed of two commonly used techniques. The study uses the most recent sets of proton-proton collision data recorded by the CMS detector at sqrt(s) = 13 TeV. [Preview Abstract] |
Saturday, April 14, 2018 11:57AM - 12:09PM |
B09.00007: Searches for Electroweak Production of Compressed Supersymmetry with Soft Leptons and Missing Transverse Momentum in $pp$ Collisions at $\sqrt{s}=$ 13 TeV with the ATLAS Detector Sheena Schier Supersymmetry (SUSY) is an extension of the Standard Model that predicts a boson (fermion) partner for each fermion (boson) in the Standard Model. Weak scale SUSY is attractive for reasons like improving gauge coupling unification, reducing fine-tuning in the Higgs sector and providing a dark matter candidate. In this talk, I present a dedicated search for direct production of new colorless weak scale states in a compressed mass spectra with final states characterized by soft visible decay products. This analysis uses $pp$ collisions at $\sqrt s$ = 13 TeV at the Large Hadron Collider and collected by the ATLAS experiment during 2015 and 2016 corresponding to 36.1 $fb^{-1}$ of integrated luminosity. This analysis selects events with two soft electrons or muons and missing transverse momentum ($E_T^{miss}$) recoiling against hadronic initial state radiation. Backgrounds from $t\bar{t}$, diboson, and other production mechanisms with prompt leptons are estimated with Monte Carlo simulation while reducible backgrounds with instrumental $E_T^{miss}$ and fake/non-prompt leptons is estimated with a mix of Monte Carlo and data-driven methods. Results are consistent with Standard Model expectation and limits on compressed supersymmetric states are extended for the first time since LEP. [Preview Abstract] |
Saturday, April 14, 2018 12:09PM - 12:21PM |
B09.00008: Search for supersymmetry in final states with photons and missing transverse energy at 13 TeV Allison Reinsvold Hall A search for supersymmetry in final states with photons and missing transverse energy in proton-proton collisions at the CMS detector in 2016 is presented. The data sample corresponds to an integrated luminosity of 35.9/fb collected at a center-of-mass energy of 13 TeV. 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 models of gauge-mediated supersymmetry breaking. Gluino masses below 1.88 TeV and squark masses below 1.68 TeV are excluded at a 95\% confidence level. [Preview Abstract] |
Saturday, April 14, 2018 12:21PM - 12:33PM |
B09.00009: Search for supersymmetry in proton-proton collisions at 13 TeV using identified top quarks Hui Wang My presentation is based on the analysis of searching for supersymetric particles, with the data collected by CMS detector in 2016, at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 35.9 inverse fb. This analysis focuses on simplified SUSY models with top quarks and large missing transverse momentum in all hadronic final states. These channels have distinctive signatures and a powerful customized top tagger further optimizes the events selection. No statistically significant excess of standard model is observed but the previous limits of the masses of supersymetric particles are extended. [Preview Abstract] |
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