Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session D9: Physics Research at the LHC |
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Sponsoring Units: DPF Chair: Ayana Arce, Duke University Room: Maryland A |
Saturday, February 13, 2010 1:30PM - 1:42PM |
D9.00001: LHC Physics Potential {\em vs.} Energy Chris Quigg Parton luminosities are convenient for estimating how the physics potential of Large Hadron Collider experiments depends on the energy of the proton beams. I present parton luminosities and ratios of parton luminosities for $gg$, $u\bar{d}$, and $qq$ interactions over the energy range relevant to the Large Hadron Collider, along with example analyses for specific processes. [Preview Abstract] |
Saturday, February 13, 2010 1:42PM - 1:54PM |
D9.00002: Search for Pair Production of First Generation Scalar Leptoquarks at the CMS Experiment Elizabeth Twedt Leptoquarks are theoretical particles carrying both lepton number and quark flavor. They are predicted to exist by Grand Unified Theories, technicolor and composite models, among others. Early results from the search for pair production of first generation scalar leptoquarks at the CMS experiment at the CERN LHC $pp$ collider are presented. Both the discovery potential and exclusion limit for CMS with $pp$ collisions at a center of mass energy of $\sqrt{s}$ = 7 TeV are explored. [Preview Abstract] |
Saturday, February 13, 2010 1:54PM - 2:06PM |
D9.00003: ABSTRACT WITHDRAWN |
Saturday, February 13, 2010 2:06PM - 2:18PM |
D9.00004: Search for Supersymmetry in the Same-Sign Dilepton Channel with the CMS detector Arun Luthra Events with same-sign dileptons, high $p_T$ multijets and large missing energy represent a very low Standard Model background at the LHC. In regions of the Supersymmetry parameter space which are accessible in the first $100$ $pb^{-1}$ of integrated luminosity, there are expected to be low momentum leptons which are not strongly isolated from the rest of the event. Using a pseudo-data sample of 10 TeV pp collisions reconstructed by a full simulation of the CMS detector, we will present a search for an excess of low momentum same-sign dilepton events over a data driven estimate of the background. [Preview Abstract] |
Saturday, February 13, 2010 2:18PM - 2:30PM |
D9.00005: SUSY searches at ATLAS in di-jet and multi-jet channels using alternatives to missing transverse energy R. Pravahan, K. De We investigate the possibilities of discovering Supersymmetry (SUSY) in the di-jet and multi-jet channels using the ATLAS detector at the LHC with $\sqrt {s}=10$ TeV. This analysis investigates alternatives to reconstructed missing transverse energy ($E_T^{Miss}$) as the signature for LSP production in SUSY events, since ($E_T^{Miss}$) may be difficult to measure accurately during early data taking. Such alternative techniques of constructing kinematic variables can be used to search for new physics channels that produce jets and weakly interacting stable particles. We explore a number of kinematic variables to study the discovery significance for various SUSY models with $200 pb^{-1}$ of integrated luminosity. In this talk I will present the work we have done towards the goal to study and understand if any one or combination of these variables can be used in place of, or in conjunction with $E_T^{Miss}$, to yield better discovery significance. [Preview Abstract] |
Saturday, February 13, 2010 2:30PM - 2:42PM |
D9.00006: Plans to Search for New Particles Decaying to Dijets at CMS Sertac Ozturk, Robert Harris The Compact Muon Solenoid (CMS) is one of two multi-purpose detectors which is located on the Large Hadron Collider (LHC) at CERN. We use a generated pseudo-data sample corresponding to $10$ $pb^{-1}$ of integrated luminosity at a pp collision energy of 10 TeV to test CMS plans to search for new particles decaying to two high energy jets (dijets). By construction the measured dijet mass spectrum agrees with the QCD prediction. Applying our search to this pseudo-data sample, we set upper limits on the cross section for dijet resonances. This analysis shows that CMS will be sensitive to new particles decaying to dijets, and if we measured this pseudo-dataset produced from QCD alone, we would exclude at 95\% confidence level the following new particles: axigluons and flavor universal colorons with mass below $1.8$ $TeV$, excited quarks with mass below $1.8$ $TeV$ and E$_{6}$ diquarks with mass below $1.0$ $TeV$ and mass between $1.3$ $TeV$ and $1.7$ $TeV$. [Preview Abstract] |
Saturday, February 13, 2010 2:42PM - 2:54PM |
D9.00007: MUSiC - Model-independent search for deviations from Standard Model predictions in CMS Holger Pieta We present an approach for a model independent search in CMS. Systematically scanning the data for deviations from the standard model Monte Carlo expectations, such an analysis can help to understand the detector and tune event generators. By minimizing the theoretical bias the analysis is furthermore sensitive to a wide range of models for new physics, including the uncounted number of models not-yet-thought-of. After sorting the events into classes defined by their particle content (leptons, photons, jets and missing transverse energy), a minimally prejudiced scan is performed on a number of distributions. Advanced statistical methods are used to determine the significance of the deviating regions, rigorously taking systematic uncertainties into account. A number of benchmark scenarios, including common models of new physics and possible detector effects, have been used to gauge the power of such a method. [Preview Abstract] |
Saturday, February 13, 2010 2:54PM - 3:06PM |
D9.00008: MSSM $\mathbf{H^\pm \rightarrow \chi^\pm \chi^0}$ Searches Caleb Lampen \def\met{\mbox{$\rm {\hbox{E\kern-0.5em\lower-.1ex\hbox{/}}}_T$}} In the Minimum Supersymmetric Standard Model (MSSM), the charged Higgs boson ($ H^\pm$) can decay into a chargino-neutralino ($\chi^\pm \chi^0 $) pair producing the final states containing three leptons (electron/muon) and missing transverse energy ($3l+\met$). The early ATLAS data of approximately $200\ pb^{-1}$ can be investigated to determine the $3l+\met$ background shapes for numerous new physics searches beyond the SM. Monte Carlo studies related to such background determination in $3l+\met$ channel along with a preliminary sensitivity study for the MSSM $H^\pm \rightarrow \chi^\pm \chi^0 \rightarrow 3l+\met$ search are presented here. [Preview Abstract] |
Saturday, February 13, 2010 3:06PM - 3:18PM |
D9.00009: Measurement of Missing Transverse Energy using the ATLAS Detector at the Large Hadron Collider Adam Yurkewicz An important experimental signature for many physics processes to be studied with the ATLAS detector at the Large Hadron Collider (LHC) is missing transverse energy, $E_{T}^{Miss}$. The energy carried away by weakly or non-interacting particles such as neutrinos produced in particle collisions is inferred from an imbalance in the vector sum of energy measured transverse to the proton beam axis, the $E_{T}^{Miss}$. Many theories predict the production of new neutral, stable, and weakly interacting particles in LHC collisions. A signature of such a particle's production would be $E_{T}^{Miss}$. In this talk, the design of the ATLAS $E_{T}^{Miss}$ reconstruction software algorithms will be presented, along with performance studies using simulated and cosmic-ray data collected by the ATLAS detector. [Preview Abstract] |
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