Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session T9: New Particle Searches III |
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Sponsoring Units: DPF Chair: Graham Wilson, University of Kansas Room: Embassy E |
Monday, April 2, 2012 3:30PM - 3:42PM |
T9.00001: Search for supersymmetry in events with large missing energy and multijets Jared Sturdy We present a search for new physics in events with large missing energy and at least 3 jets collected in proton-proton collisions at a center-of-mass energy of 7 TeV. The search is performed using a dataset collected in 2011 with the CMS detector and corresponding to an integrated luminosity of 4.7 fb$^{-1}$. We evaluate all backgrounds using various data-driven techniques. Results are interpreted within the context of the constrained minimal supersymmetric extension of the standard model (CMSSM) as well as several simplified models particularly suited to our search channel. [Preview Abstract] |
Monday, April 2, 2012 3:42PM - 3:54PM |
T9.00002: Search for New Physics with the ATLAS Detector in pp Collisions at $\sqrt{s}$ = 7 TeV in Hadronic Final States with Missing Transverse Energy and Heavy Flavor Bart Butler Results are presented of a search for new physics in events with hadronic final states, large missing transverse momentum and b-tagged jet candidates in $\sqrt{s}$ = 7 TeV proton-proton collisions. Several signal regions corresponding to different regions of kinematic phase space are examined. The data sample was recorded by the ATLAS experiment at the Large Hadron Collider in 2011. The results are interpreted in the context of phenomenological new physics models. [Preview Abstract] |
Monday, April 2, 2012 3:54PM - 4:06PM |
T9.00003: Search for new physics in events with b-jets and missing transverse energy in pp collisions at 7 TeV Wee Don Teo We present a search for physics beyond the Standard Model (SM) based on events with large missing transverse energy, at least three jets, and at least one identified b-jet. All major SM backgrounds are evaluated using data-driven techniques. The number of events observed is consistent with the SM expectation. We set 95\% confidence level upper limits on the cross sections of b-quark-rich simplified models, and exclusion limits in the context of the constrained minimal supersymmetric extension of the SM. [Preview Abstract] |
Monday, April 2, 2012 4:06PM - 4:18PM |
T9.00004: Search for New Physics with a Monojet and Missing Transverse Energy in 7 TeV pp collisions at CMS Mehmet Vergili We present a search for new physics in events with a single energetic jet and large missing energy in proton-proton collisions at a center-of-mass energy of 7 TeV. The search is performed using data collected by the CMS detector and corresponding to an integrated luminosity of 4.7 fb$^{-1}$. The topology is a signature of many new physics models, including large extra dimensions in the framework of ADD, Unparticle production and several dark matter scenarios. Results are interpreted within the context of each of these models, including the production of dark matter. [Preview Abstract] |
Monday, April 2, 2012 4:18PM - 4:30PM |
T9.00005: Search for Gauge Mediated Supersymmetry Breaking in Events with Two Photons and Missing Energy Using the CMS Detector at the LHC Yueh-Feng Liu We present a search for Gauge Mediated Supersymmetry Breaking with two photons and large missing transverse energy in the final state using the CMS experiment at the Large Hadron Collider. The analysis is based on pp collision data at $\sqrt{s}=7$ TeV comprising an integrated luminosity of 4.7 fb$^{-1}$. We compare the missing transverse energy distribution with the spectrum expected from Standard Model processes and present the latest results based on the 2011 CMS dataset. [Preview Abstract] |
Monday, April 2, 2012 4:30PM - 4:42PM |
T9.00006: Heavy Charged Leptons in 6-dimensional Randall-Sundrum Model Erin De Pree, Dietrich Kiesewetter We consider the effects of adding a fourth generation to a model with two compactified extra dimensions -- one warped and the other flat. The extra dimensions lead to towers of Kaluza-Klein (KK) Z bosons. Interestingly, the higher KK-Z modes depending on the flat dimension contribute more than the warped dimension. These KK-Z modes enhance the cross-section of fourth generation charged leptons . The most promising signature is the heavy charged lepton decaying to a heavy neutrino and W boson. [Preview Abstract] |
Monday, April 2, 2012 4:42PM - 4:54PM |
T9.00007: SUSY Effects in $t\overline{t}$ Production in the CP-Violating MSSM at the LHC Alexander Moreno Briceno, Stefan Berge, Margarete Muehlleitner, Doreen Wackeroth, Martin Wiebusch We investigate possible CP violating effects due to one loop MSSM corrections to top-quark pair production at the LHC. We include supersymmetric QCD as well as supersymmetric electroweak contributions to the top-quark pair production mechanisms, namely quark-antiquark annihilation, $q\overline{q}\rightarrow t\overline{t}$, and gluon-gluon fusion, $gg\rightarrow t\overline{t}$. At the level of the top quarks, we study in detail spin-spin correlating observables that are sensitive to CP violating phases of the complex MSSM. [Preview Abstract] |
Monday, April 2, 2012 4:54PM - 5:06PM |
T9.00008: SCET improved SUSY search Xiaohui Liu, Sonny Mantry, Frank Petriello Supersymmetry has been one of the most popular candidates for physics beyond standard model (SM) for a long time. The fact that we haven't yet discover super particles in nowadays LHC data, pushes the SUSY production nearer and nearer to the LHC machine threshold. In the threshold limit, how well we understand the SM background is crucial for SUSY or other physics beyond SM search. In this talk, we will use the simplest case by considering photon plus two jets events to address the problem and we will talk about how we use the soft collinear effective theory to sum up potentially large logs related to threshold limit to improve our understanding of the SM background. [Preview Abstract] |
Monday, April 2, 2012 5:06PM - 5:18PM |
T9.00009: Search for Z' resonances decaying into top-antitop pairs in fully leptonic final state at CMS Supriya Jain We present a search for narrow-width resonances (Z') decaying to top-antitop pairs using 4.6 /fb of data recorded by the CMS detector at the LHC in proton-proton collisions at $\sqrt{s}$ = 7 TeV. No significant deviation from Standard Model prediction is observed. We, therefore, set 95\% confidence-level upper limits on the production cross section of the narrow-width resonance times its branching fraction to top-antitop for different resonance masses. [Preview Abstract] |
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