Bulletin of the American Physical Society
77th Annual Meeting of the Southeastern Section of the APS
Volume 55, Number 10
Wednesday–Saturday, October 20–23, 2010; Baton Rouge, Louisiana
Session JD: Particle Physics: ATLAS, BABAR, and T2K |
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Chair: Anton Tonchev, Duke University Room: Nicholson Hall 108 |
Friday, October 22, 2010 3:45PM - 3:57PM |
JD.00001: Study of W boson production using the ATLAS detector Will Hunter, Joshua Loyal, Zongjin Qian The Large Hadron Collider is now in operation and providing 7 TeV proton-proton collisions for physics measurements. These data are being used by the ATLAS Collaboration to establish the detector's performance and to provide tests of the Standard Model in a new energy domain. We will present studies of $pp\rightarrow W+X \rightarrow \ell\nu$+X production. Events are selected where the $W$ decays to an electron or muon and missing energy as a signal for neutrinos. Methods for selecting these events will be discussed along with the results of early measurements. [Preview Abstract] |
Friday, October 22, 2010 3:57PM - 4:09PM |
JD.00002: Study of Z boson production using the ATLAS detector Will DiClemente, Jim Mallernee, Toney Thompson The ATLAS detector is recording data from 7 TeV proton-proton collisions provided by the CERN Large Hadron Collider. These data are being used to evaluate the ATLAS detector's performance using high eneergy electrons, muons and jets. The measurements provide tests of the Standard Model in a new energy domain. We will present studies of $pp\rightarrow Z+X \rightarrow \ell\ell$+X production. Events are selected where the $Z$ boson decays to electron or muon pairs. Methods for selecting these events will be discussed along with the results of early measurements of the Z boson's production properties. [Preview Abstract] |
Friday, October 22, 2010 4:09PM - 4:21PM |
JD.00003: Discovering Black Holes Using Top Quarks at ATLAS Travis Byington The ATLAS detector at the Large Hadron Collider can identify top quarks, which might be produced by non-Standard Model processes such as black hole decays. We explore simulations of black hole production in 7 TeV proton collisions when a top quark is produced in the black hole decay. In this talk, I will discuss prospects for discovering black holes at the LHC using top quark final states. [Preview Abstract] |
Friday, October 22, 2010 4:21PM - 4:33PM |
JD.00004: Prospects for Black Hole discovery at ATLAS in the Graviton + X Final State Laura Dodd The ATLAS detector is a general purpose experiment currently recording 7 TeV proton collisions at the Large Hadron Collider (LHC). Some theoretical models predict that LHC collisions can produce microscopic black holes which would decay into gravitons and other particles. We have simulated $p+p$ production of black holes with different model parameters, and investigated the experiment's sensitivity to black hole decays with a graviton in the final state. In this talk, I will discuss studies to optimize the black hole signal significance. [Preview Abstract] |
Friday, October 22, 2010 4:33PM - 4:45PM |
JD.00005: Search for non-Standard Model CP-odd Higgs Boson Romulus Godang We search for a new light non-Standard Model CP-odd Higgs boson, A0, using a data sample of Upsilon(1S), Upsilon(2S), and Upsilon(3S) collected by the BABAR detector at the SLAC PEP-II B-factory. We also search for an undetectable Upsilon(1S) decay recoiling against the dipion system. Our results constrain to the simplest minimal supersymmetric model extension, the next-to-minimal supersymmetric model (NMSSM). [Preview Abstract] |
Friday, October 22, 2010 4:45PM - 4:57PM |
JD.00006: Measurement of the Branching Fraction of B0bar-$>$ D*+ Lepton Neutrino Christopher Buchanan, Shannon Eynon, Romulus Godang We present a measurement of the branching fraction of semileptonic anti-B0 meson decays to D*+ meson, lepton, and anti-neutrino using 476 million B-meson anti-B-meson pairs. The data sample collected with the BABAR detector at the PEP-II asymmetric-energy B-Factory at SLAC National Accelerator Laboratory. The anti-B0 mesons are reconstructed using a novel technique, partial reconstruction, where the D0 mesons are not reconstructed. The D*+ mesons are detected only through the soft pion daughter from the decay D*+ to D0 pi+. We use a single and double tag method to measure the semileptonic branching fraction. This precise measurement plays a prominent role in high energy physics particularly in heavy flavor physics. [Preview Abstract] |
Friday, October 22, 2010 4:57PM - 5:09PM |
JD.00007: Measurement of the Branching Fraction of Y(4S) to B0-B0bar Shannon Eynon, Christopher Buchanan, Romulus Godang Based on a data sample of 476 million B-meson anti-B-meson pairs collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy B-Factory at SLAC, we measure a model independent measurement of the branching fraction of Upsilon(4S) decays to B0 and anti-B0 pair. The B mesons are reconstructed in the channel anti-B0 decays to D*+ lepton anti-neutrino using a partial reconstruction method. Our result does not depend on any branching fractions, the simulated reconstruction efficiency, the ratio of the charged and neutral B-meson lifetimes, or assumption of isospin symmetry. This measurement is important for normalizing many B-decay branching fractions. [Preview Abstract] |
Friday, October 22, 2010 5:09PM - 5:21PM |
JD.00008: Recent Status of the T2K Experiment Thomas Kutter The T2K (Tokai to Kamioka) long baseline neutrino oscillation experiment has been constructed to search for the appearance of electron neutrinos in a pure beam of muon neutrinos, thereby measuring theta-13, the last unknown mixing angle in the lepton sector. T2K physics goals also include precision measurements of muon neutrino disappearance and the measurements of neutrino interactions at neutrino energies of $\sim $1GeV. The first physics data were collected from January to June 2010 and data analysis is in progress. I will review the physics reach of T2K, provide an overview of the experimental setup and present the performance of the accelerator produced neutrino beam as well as the near and far detectors. The presentation will conclude with a description of the analysis strategy and recent progress. [Preview Abstract] |
Friday, October 22, 2010 5:21PM - 5:33PM |
JD.00009: The ND280 Near Detector of the T2K Experiment William Coleman The Tokai to Kamioka (T2K) experiment is a long-baseline neutrino oscillation experiment designed to improve the sensitivity to $\theta _{13}$ and to determine more accurately the ``atmospheric'' parameters $\theta _{23}$ and $\Delta $m$_{23}^{2}$. For this purpose a high intensity v$_{\mu }$ beam ($\sim $700 MeV peak energy) produced at the JPARC accelerator complex is directed towards the Super-Kamiokande (SK) detector at a distance of 295 km. An off-axis near detector (ND280), 280 m from the production target, was designed and constructed to measure the energy spectrum, flavor content and neutral and charged current interaction rates of the un-oscillated neutrino beam. All ND280 detector components - Time Projection Chambers (TPCs), Fine-Grained Scintillator detectors (FGDs), electro-magnetic calorimeters (ECALs) and Side Muon Range Detector (SMRD) -- have been commissioned and physics data taking is underway. In this presentation, the performance of ND280 and its role in the T2K analyses will be discussed. [Preview Abstract] |
Friday, October 22, 2010 5:33PM - 5:45PM |
JD.00010: Data Analysis Using the Side Muon Range Detector (SMRD) of the T2K Experiment Jeremiah Haremza, Ryan Minvielle The goal of T2K (Tokai to Kamioka), a second generation long basline neutrino experiment, is to obtain an accurate measurement of $\theta_{13}$ - a parameter which determines the oscillation between muon neutrinos and electron neutrinos. The T2K 2.5$^{\circ}$ off-axis near detector (ND280) is located 280 m from the beam target, and consists of 5 different sub-detectors which are encased in the UA1 magnet. The SMRD (Side Muon Range Detector), 1 of the 5 sub-detectors of the ND280, consists of slabs of 0.7 cm thick plastic scintillator material with embedded wavelength shifting fibers and each scintillator slab is sandwiched between the iron plates of the magnet yokes. The SMRD contributes to the measurement of the neutrino energy spectrum, triggers on cosmic ray muons for calibration, and identifies backgrounds. We present work on the following uses of the SMRD: (1) the general role of the SMRD in T2K analyses, (2) status of data quality considerations and data selection performance, (3) SMRD performance measurement with cosmic ray data and comparison with simulations, (4) extraction of neutrino cross-sections on Fe and comparison with simulations. [Preview Abstract] |
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