Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session J7: Searches for Exotic Particles II |
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Sponsoring Units: DPF Chair: Sally Dawson, Brookhaven National Laboratories Room: Marriott Tampa Waterside Room 1 |
Sunday, April 17, 2005 10:45AM - 11:09AM |
J7.00001: Physics with the CMS Experiment in the First Year of LHC Dimitri Bourilkov The preparations of the CMS collaboration for first data taking, when the Large Hadron Collider (LHC), located close to Geneva, Switzerland, starts to circulate and collide proton-proton beams at center-of-mass energies around 14 TeV in 2007, are presented. This new and unexplored energy domain will provide unique opportunities to search for new physics at the TeV scale, a preferred region for many extensions of the Standard Model. The status of the CMS detector and the possible impact of staging on the physics program are presented, followed by a description of the main data samples and their use for alignment and calibration. Selected search channels and signatures for Higgs bosons, Supersymmetry, Extra dimensions and Contact interactions will be discussed. [Preview Abstract] |
Sunday, April 17, 2005 11:09AM - 11:33AM |
J7.00002: Physics reach of the ATLAS experiment during the first LHC run Matt Dobbs We discuss the ATLAS physics programme for the first year of LHC operation. The layout of the initial (staged) detector will be described, as well as the impact of staging on the physics reach. The main data samples and strategies which will be used to calibrate, align and understand the detector response will be presented. Finally, the physics channels which will be addressed in the first months of operation will be discussed. These include a low-mass Higgs boson, also in view of the possible competition with the Tevatron experiments, and Supersymmetry, for which a striking signal might be observed after only a few months of data taking. The impact of a realistic non-optimal detector performance, as expected at the beginning, will be illustrated in some cases. [Preview Abstract] |
Sunday, April 17, 2005 11:33AM - 11:45AM |
J7.00003: Beyond Standard Model Higgs Search at the Large Hadron Collider Satyaki Bhattacharya The experiments at the Large Hadron Collider (LHC) will probe for Higgs boson in the mass range between the lower bound on the Higgs mass set by the experiments at the Large Electron Positron Collider (LEP) and the unitarity bound ($\sim $1 TeV). Strategies are being developed to look for signatures of Higgs boson as predicted by the Standard Model as well as for signatures of Higgs bosons predicted by theories beyond Standard Model. In particular, search for a Minimal Supersymmetric Standard Model (MSSM) Higgs boson will be a major part of the Higgs search efforts at LHC. In this paper search strategies for Higgs beyond Standard Model will be discussed with emphasis on MSSM Higgs discovery channels which cover large regions of the MSSM parameter space. [Preview Abstract] |
Sunday, April 17, 2005 11:45AM - 11:57AM |
J7.00004: Search for High Transverse Momentum Lepton Pairs in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV Jane Nachtman, Michael Schmitt A new signature-based search has been devised, sensitive to an excess of opposite-sign electron or muon pairs at high dilepton transverse momentum~($q_T$) and moderate di-lepton mass~($M_{\ell\ell}$). Such pairs would be expected in the associated production of~$\tilde{\chi}^+_1\tilde{\chi}^0_2$, for example. The technique is completely new, with several advantages over the classical `tri-lepton' search, which it complements. The key component is the comparison of events in a given range of~$M_{\ell\ell}$ to those in the region of the $Z$-resonance, as a function of~$q_T$. We have obtained a preliminary result in the di-muon channel, based on approximately $325$ pb$^{-1}$ of~$p\bar{p}$ collisions recorded with the CDF~II detector. [Preview Abstract] |
Sunday, April 17, 2005 11:57AM - 12:09PM |
J7.00005: Search for New Physics in the DiElectron Channel at CDF Sam Harper We present a measurement of the Drell-Yan mass spectrum at high energies in the electron channel using approximately $400$ pb$^{-1}$ of proton-antiproton collision data taken with the CDF detector at a centre of mass energy of $1.96$ TeV. We interpret this mass spectrum to provide limits on the production rates of new neutral massive particles decaying to two electrons. Examples of such particles include $Z'$ bosons resulting from various new physics models and the Randal-Sundrum Gravitons. [Preview Abstract] |
Sunday, April 17, 2005 12:09PM - 12:21PM |
J7.00006: Search for Quark-Lepton Compositeness in the Dimuon Channel Nguyen Xuan Data collected with the D{\O} detector at the Fermilab Tevatron at $\sqrt{s}$ = 1.96 TeV are used to search for compositeness of quarks and leptons. The high-mass dimuon mass spectrum obtained with an integrated luminosity of 300 pb$^{-1}$ is compared with that predicted by Drell-Yan (DY) scattering modified by a contact interaction. This interaction is parameterized by a compositeness scale factor $\Lambda$. Preliminary limits on $\Lambda$ are set for constructive and destructive interference between the DY amplitude and the contact interaction for various quark and lepton chiralities. [Preview Abstract] |
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