Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session X9: Supersymmetry Searches |
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Sponsoring Units: DPF Chair: Marcela Carena, FermiLab Room: Roosevelt 1 |
Tuesday, January 31, 2017 10:45AM - 10:57AM |
X9.00001: Search for New Phenomena in High-multiplicity Final States Using 8 TeV and 13 TeV LHC Data Tutanon Sinthuprasith The first dedicated search based on data from proton-proton collisions corresponding to an integrated luminosity of 19.6 fb$^{-1}$ collected with the CMS detector at the LHC at $\sqrt{s}$ = 8 TeV is presented for new phenomena in inclusive eight- and ten-jet final states with low missing transverse momentum, with and without identification of jets originating from b quarks. The dominant multijet background expectations are obtained from low jet multiplicity control samples. Data agree well with the standard model background predictions, and limits are set in several benchmark models -Colorons, axigluons, and gluinos in R-parity violating supersymmetric scenarios. These results comprise the first experimental probe of the coloron and axigluon models in multijet final states. The second search based on 13 TeV LHC data, corresponding to an integrated luminosity of 2.2 fb$^{-1}$ in 2015 is performed in energetic multi-particle final states. Model-independent limits on the cross section times acceptance of a new physics signal in these final states are set and further interpreted in terms of limits on the production of black holes. [Preview Abstract] |
Tuesday, January 31, 2017 10:57AM - 11:09AM |
X9.00002: Background estimation techniques search for scalar top-quark production with top quark tagging in the all-hadronic channel at 13 TeV with the CMS detector Yagya Joshi Within the search for supersymmetry in all-hadronic events with missing transverse momentum using top quark tagging the lost lepton and hadronic tau backgrounds estimations will be discussed. The performance of the tagging algorithm for the top candidates as well as the design of the algorithm will be demonstrated for the 2016 proton-proton running period at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. [Preview Abstract] |
Tuesday, January 31, 2017 11:09AM - 11:21AM |
X9.00003: Optimization of a search for top squark decays to a b-quark and a chargino in final states with one lepton in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector James Sheplock We present the results of an optimization study for a top squark search signal region. The scenario studied is the decay to a b-quark and a chargino, with compressed chargino and neutralino mass splitting. This compressed scenario leads to an off-shell W-boson, which produces a low-energy final state lepton. For high top squark masses, the final state has a high-energy b-jet and large missing transverse energy. Using this signature, we optimize the signal region for discrimination against the Standard Model background across a range of signal mass points. [Preview Abstract] |
Tuesday, January 31, 2017 11:21AM - 11:33AM |
X9.00004: Search for Supersymmetry with Vector Boson Fusion-like Topology Ali CELIK A search of supersymmetry (SUSY) with two jets in vector-boson fusion (VBF) topology is presented using data collected by the CMS detector in proton-proton collisions at the LHC. Final states containing at least one low energy lepton are expected in SUSY compressed mass spectra for pair production of charginos and neutralinos. The standard model backgrounds are reduced by requiring a presence of missing energy and two jets with large rapidity separation expected in VBF topology. The final state without leptons in VBF dijet + MET topology provides a stringent limit on squark mass in the compressed mass scenario. We will show results from zero and dilepton final states at 8 TeV and single lepton study at 13 TeV. [Preview Abstract] |
Tuesday, January 31, 2017 11:33AM - 11:45AM |
X9.00005: A search for B−L R-parity-violating top squark decays in $\sqrt{s}=$ 13 TeV $pp$ collisions with the ATLAS detector Ian Dyckes A search for pair produced massive particles decaying to b-quarks plus leptons is presented using the $\sqrt{s}=13$ TeV proton-proton collision data collected with the ATLAS detector at the LHC in 2016. This search is motivated by a B-L extension to the MSSM, in which the scalar partner of the top quark (the stop) may be the Lightest Supersymmetric Particle (the LSP). In this model, the stop predominantly decays via an R-Parity violating coupling to a b-quark plus a lepton. This model is targeted by searching for an excess in final states containing b-tagged jets and two light leptons (electrons or muons). [Preview Abstract] |
Tuesday, January 31, 2017 11:45AM - 11:57AM |
X9.00006: Motivation for a Search for scalar top-quark production with top quark tagging in the all-hadronic channel at 13 TeV with the CMS detector Scarlet Norberg Motivation behind the search for supersymmetry in all-hadronic events with missing transverse momentum using top quark tagging is presented. The search regions that include variables such as reconstructed jets, the presence of bottom or top quark candidates used for this analysis are defined for the 2016 proton-proton running period at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. An overview of the models that are used to interpret the results are discussed as well. [Preview Abstract] |
Tuesday, January 31, 2017 11:57AM - 12:09PM |
X9.00007: Search for R-parity violating supersymmetry with displaced vertices in proton-proton collisions at sqrt(s)=8 TeV Jennifer Chu Results are reported from a search for $R$-parity violating supersymmetry in proton-proton collision events collected by the CMS experiment at a center-of-mass energy of $\sqrt{s}=8$~TeV. The data sample corresponds to an integrated luminosity of 17.6~fb${}^{-1}$. This search assumes a minimal flavor violating model where the lightest supersymmetric particle is a long-lived neutralino or gluino, leading to a signal with jets emanating from displaced vertices. In a sample of events with two displaced vertices, no excess yield above the expectation from standard model processes is observed, and limits are placed on the pair production cross section as a function of mass and lifetime of the neutralino or gluino. For a mass of 400~GeV and mean proper decay length of 10~mm, the analysis excludes cross sections above 0.6~fb at 95\% confidence level. The results are also applicable to other models in which long-lived particles decay into multijet final states. [Preview Abstract] |
Tuesday, January 31, 2017 12:09PM - 12:21PM |
X9.00008: Search for disappearing tracks at CMS using 13 TeV data Andrew Hart A search is presented for long-lived charged particles that decay within the CMS detector, producing the signature of a disappearing track. Candidate disappearing tracks are identified as isolated tracks with no associated hits in the muon detectors, small associated calorimeter energy deposits, and missing hits in the outer layers of the silicon tracker. The search uses proton-proton collision data obtained at 13 TeV during 2015 and 2016, and the results are interpreted in the context of anomaly-mediated supersymmetry breaking (AMSB). [Preview Abstract] |
Tuesday, January 31, 2017 12:21PM - 12:33PM |
X9.00009: Search for boosted Stealth SUSY with photons and jets using 13TeV LHC data. Savvas Kyriacou An analysis is designed and performed on proton-proton collision data collected by the CMS experiment at a center of mass energy of 13TeV, targeting the pair production of squarks with a final state composed of photons, jets and low missing transverse energy. This search, motivated by a number of models such as stealth supersymmetry, focuses on the boosted regime, where photons and gluons merge in multi-core jet configurations, investigating thus a previously unexplored region. Substructure variables such as N-subjettiness, are utilized to discriminate these structure rich jets against standard model background. The analysis development and results are presented. [Preview Abstract] |
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