Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session K11: Neutrino Astronomy II and Elementary Particles |
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Sponsoring Units: DAP Chair: Lisa Gerhardt, University of California, Irvine Room: Hyatt Regency Jacksonville Riverfront City Terrace 7 |
Sunday, April 15, 2007 1:15PM - 1:27PM |
K11.00001: Studying Neutrino Oscillations Using Quasi-Elastic Events in MINOS. Sujeewa Kumaratunga MINOS (Main Injector Neutrino Oscillation Search), is a long baseline neutrino experiment studying neutrino oscillations using two detectors, one at Fermi National Accelerator Laboratory, IL (Near Detector) and the other at Soudan, MN (Far Detector). It will study $\nu _{\mu}$ oscillations and make a measurement of the oscillation parameters, $\Delta $m$^{2}_{23}$ and sin$^{2}$2$\theta _{23}$, using a $\nu _{\mu}$ beam made at Fermilab. Charge current neutrino interactions in the MINOS detectors are of three types: quasi-elastic scattering (QEL), resonance scattering (RES) and deep inelastic scattering (DIS). Of these, quasi-elastic scattering leaves the cleanest signal with just one $\mu$ and one proton in the final state, thus rendering the reconstruction of the neutrino energy more accurate. This talk will outline attempts to separate QEL events from the others in the two detectors in order to perform a determination of $\Delta $m$^{2}_{23}$ and sin$^{2}$2$\theta _{23}$ using those events. [Preview Abstract] |
Sunday, April 15, 2007 1:27PM - 1:39PM |
K11.00002: A Phase Transition in U(1) Configuration Space: Vortex Annihilation and Oscillons Joel Thorarinson, Marcelo Gleiser We show numerically that the low-momentum scattering of a vortex-antivortex pair leads to an oscillon for low scalar to vector mass ratios in the 2d Abelian Higgs model. The spherically symmetric oscillon lives $2-4$ orders of magnitude longer than the fundamental time scales and has an associated dipole gauge field strength and charge density. The annihilation also leaves a characteristic topological signature in the Chern-Simons density $n_{cs}$, and Higgs winding density $n_w$. The emergence of oscillons as remnants of the vortex-antivortex annihilation can be mapped onto a phase transition with control parameter given by $\beta=\frac{m^2_{scalar}}{m^2_{vector}}$ and critical value $\beta_c=0.073$. [Preview Abstract] |
Sunday, April 15, 2007 1:39PM - 1:51PM |
K11.00003: ABSTRACT WITHDRAWN |
Sunday, April 15, 2007 1:51PM - 2:03PM |
K11.00004: Empirical measurement of NC/CC ratio in neutrino-nucleon scattering with hadronic energy between 1.5 and 30 GeV Qun Wu The NOMAD experiment at CERN collected more than 1.7 million neutrino induced charged current and neutral current (CC and NC) events. This large high resolution data sample allows for the first precise, empirical measurement of the ratio of the NC to CC cross sections in the hadronic energy range 1.5 to 30 GeV. This ratio measurement will have a direct application in determining background levels at current and proposed long baseline neutrino oscillation experiments, such as MINOS and NO$\nu$A. The measured ratio will be presented, focusing on the likelihood technique used for NC/CC separation and a brief discussion of the application of this result to MINOS. [Preview Abstract] |
Sunday, April 15, 2007 2:03PM - 2:15PM |
K11.00005: Electron Identification with the ATLAS Barrel Transition Radiation Tracker. Alex Harvey, Oliver K. Baker, Kenneth W. McFarlane The ATLAS Barrel Transition Radiation Tracker (TRT), one of the new detectors, is capable of identifying high-energy electrons in a large background of heavier particles. This capability is needed for several possible physics discoveries at the CERN LHC. Data were taken at the ATLAS Combined Test Beam (CTB) run in 2004 using beams of high-momentum electrons, muons, pions, and photons produced with the CERN SPS. Tuning the MC simulated performance to match the CTB data is expected to result in an accurate simulation of the performance of the TRT in ATLAS. Current physics simulations have benefited from CTB data. This talk will provide an overview of the comparison of the TRT electron identification performance as determined from the CTB data analysis and MC simulations. [Preview Abstract] |
Sunday, April 15, 2007 2:15PM - 2:27PM |
K11.00006: ABSTRACT WITHDRAWN |
Sunday, April 15, 2007 2:27PM - 2:39PM |
K11.00007: A Theory of Flavor and Set of the Interaction Structural Parts Rasulkhozha Sharafiddinov At the availability of a sharp interconnection, the difference in sizes of Dirac and Pauli form factors of a massive neutrino must constitute their linearly ordered set. Such a class of currents can lead in the field of a spinless nucleus to the constitution of a partially ordered set of the cross sections of polarized and unpolarized neutrinos scattering. We discuss a theory, in which flavor conservation is predicted as a theorem about the equality of the cross sections of the interaction with a gauge boson of leptonic current structural components. This theorem relates flavor symmetry to a unification of left (right) - handed fermions of the same families of doublets or singlets. Thereby it requires follow the logic of flavordynamics from point of view of a set dynamics of a massive neutrino currents. [Preview Abstract] |
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