Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session C17: Supersymmetry Searches |
Hide Abstracts |
Sponsoring Units: DPF Chair: Heather Logan, Carleton University, Canada Room: 251E |
Saturday, April 16, 2016 1:30PM - 1:42PM |
C17.00001: A Search for Supersymmetry at CMS with Two Photons and Missing Transverse Energy at $\sqrt{s}=13$ TeV Arka Santra, Andrew Askew, Michael Hildreth, Aristoteles Kyriakis, David Mason, Allison Reinsvold, Iasonas Topsis-Giotis, Marc Weinberg A search with Gauge Mediated Supersymmetry Breaking (GMSB) is presented. This search was carried out by collecting two photons by the CMS Experiment at the LHC, CERN at $\sqrt{s}=13$ TeV. The missing transverse energy of the collected events was then compared and contrasted with the Standard Model background prediction. The background was estimated using a data-driven technique. The result was then interpreted using simplified model. [Preview Abstract] |
Saturday, April 16, 2016 1:42PM - 1:54PM |
C17.00002: Search for new physics with same-sign dileptons Christopher George Discussion of the motivation, search strategies, and results for an inclusive search for new physics in events with a same-sign dilepton pair, significant jet activity, and missing transverse energy, using the 13 TeV dataset from CMS. Results are interpreted in light of several SUSY models. [Preview Abstract] |
Saturday, April 16, 2016 1:54PM - 2:06PM |
C17.00003: Search for long-lived particles decaying to an electron and a muon that have large transverse impact parameters. Bingxuan Liu A search for long-lived particles decaying to leptons using proton-proton collisions produced by the LHC is described. The talk will cover both the search published using data collected by the CMS detector at sqrt(s) = 8 TeV, with an integrated luminosity of 19.7 inverse femtobarns, and the ongoing search using data collected by the CMS detector at sqrt(s) = 13 TeV in 2015, with an integrated luminosity of 2.5 inverse femtobarns. Both the published search and the ongoing search are selecting events with an electron and a muon that have large transverse impact parameters. The search is sensitive to a wide range of models with non prompt e-mu final states. [Preview Abstract] |
Saturday, April 16, 2016 2:06PM - 2:18PM |
C17.00004: Search for supersymmetry in the multijet and missing transverse momentum channel in pp collisions at 13 TeV: Search strategy John Bradmiller-Feld A search is presented for physics beyond the standard model at the CERN Large Hadron Collider (LHC) in events with large missing traverse energy (MHT), at least four jets, and zero electrons or muons. The multijet plus MHT final state arises in a variety of models of supersymmetry (SUSY), including those involving pair production of gluinos. Standard model (SM) backgrounds for this signature include W bosons decaying to a neutrino and charged lepton that is not identified, as well as multijet events with mis-measured jet momenta. The search is designed to extend the 8 TeV Run I limits on gluino masses with a small amount of 13 TeV data, and is performed on a sample of 2.3 fb-1 collected with the CMS detector at the LHC in 2015. This talk focuses on the search strategy, including the trigger and event selection. An overview of the methods used to estimate the SM backgrounds is also presented. The results are interpreted in the context of simplified SUSY models of gluino pair production. [Preview Abstract] |
Saturday, April 16, 2016 2:18PM - 2:30PM |
C17.00005: Search for supersymmetry in the multijet and missing transverse momentum channel in pp collisions at 13 TeV: Z + jets background Troy Mulholland We present a search for supersymmetry (SUSY) with data collected from the Compact Muon Solenoid (CMS) detector. The sample corresponds to $2.3\;\textrm{fb}^{-1}$ of proton-proton collisions with $\sqrt{s} = 13\;$TeV delivered by the Large Hadron Collider (LHC). The search looks at events with large hadronic activity, missing transverse energy, and without any identified leptons. The data are analyzed in bins of jet multiplicity, bottom-quark tagged jet (b-jet) multiplicity, scalar sum of jet transverse momentum, and vector sum of jet transverse momentum. A standard model (SM) background to this search includes the SM production of multiple jets and a Z boson that decays to two undetectable neutrinos. This talk focuses on the measurement of this particular background and its context in the wider search. Observations are consistent with SM backgrounds and limits are set on gluino mediated simplified SUSY models. [Preview Abstract] |
Saturday, April 16, 2016 2:30PM - 2:42PM |
C17.00006: Search for supersymmetry in the multijet and missing transverse momentum channel in pp collisions at 13 TeV: Hadronic tau background Ahmad Borzou An all hadronic supersymmetry search with the focus on large missing energy and multiple jets is presented where data is explored in terms of missing transverse momentum, the scalar sum of jet transverse momenta, bottom quark multiplicity, and jet multiplicity. The data is collected by the CMS detector at the Large Hadron Collider (LHC) at $\sqrt{s}$ = 13 TeV and corresponds to an integrated luminosity of 2.3 $fb^{-1}$. We will show that the data is consistent with the standard model and no excess in the observed number of events is seen. Exclusion limits, therefore, are presented for a few simplified supersymmetric models in which gluinos decay to a pair of quarks and a stable super particle that leaves the detector undetected. We show that if the stable super particle has a light mass, gluinos with mass below the range of 1.4 TeV to 1.6 TeV, depending on the model, are excluded. The involved SM backgrounds in the presented search are lost leptons, hadronically decaying taus, Z bosons that decay to neutrinos, and QCD jets. In this talk we mainly focus on the hadronically decaying taus. [Preview Abstract] |
Saturday, April 16, 2016 2:42PM - 2:54PM |
C17.00007: Search for supersymmetry in pp collisions at sqrt s = 13 TeV in the single-lepton final state using the sum of masses of large-radius jets Adam Dishaw Results are presented from a search for supersymmetric particles in pp collisions in the final state with a single, high $p_{\rm T}$ lepton; multiple jets, including at least one b-tagged jet; and large missing transverse momentum. The data sample corresponds to 2.1~fb$^{-1}$ recorded by the CMS experiment at $\sqrt s=13$ TeV. The search focuses on processes leading to high jet multiplicities, such as the simplified model T1tttt corresponding to ${\rm gg}\to{\rm \tilde g\tilde g}$ with ${\rm \tilde g}\to{\rm t}{\rm \bar t}\,{\tilde\chi^0_1}$. The quantity $M_J$, defined as the sum of the masses of the large-radius jets in the event, is used along with other kinematic variables to provide discrimination between signal and backgrounds and as a key part of the background estimation method. The observed event yields in data are consistent with those expected for standard model backgrounds. Gluinos with mass below 1575 GeV are excluded at 95$\%$ CL for T1tttt scenarios with low $\tilde\chi_1^0$ mass. [Preview Abstract] |
Saturday, April 16, 2016 2:54PM - 3:06PM |
C17.00008: Search for new physics in hadronic final states using the MT2 variable Jason Gran An inclusive search for new physics in events with fully hadronic final states using the MT2 variable is described. Results are based on a sample of 13 TeV proton-proton collisions corresponding to 2.2 fb$^{-1}$ collected with the CMS detector. The results are interpreted as limits on simplified SUSY models. [Preview Abstract] |
Saturday, April 16, 2016 3:06PM - 3:18PM |
C17.00009: A Study on Multi-Jets Final States at the Large Hadron Collider Maya Amouzegar, Eva Halkiadakis, Amitabh Lath, Scott Thomas, Yuri Gershtein The LHC (Large Hadron Collider) at CERN, located in Geneva, Switzerland, collides protons at a center of mass energy of 13 TeV. The CMS (Compact Muon Solenoid) detector is one of the four experiments that detects collisions at the LHC. One of the new physics phenomenon that is looked for by the CMS detector is Supersymmetry (SUSY). In our method, we look for these particles by looking at multi-jets final states in interactions that produce up to 8 jets in their final states. By comparing jets in new physics signals with ones produced through QCD, we would be able to predict where new physics might be lying. Since the standard model interactions mostly produce di-jets, if there is an excess of jets at a certain energy, it is possible that a process beyond the standard model is producing those jets. Most of the simulated Monte Carlo signals considered are R-Parity Violating SUSY interactions. In order to perform these studies, we studied the jets' transverse momentum (Pt) divided by the total hadronic energy in the event (HT) as a function of the jet multiplicity, between 2 and 8 jets. If there is an excess of transverse momentum, there is the possibility that SUSY particles are created and are decaying into jets. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700