Bulletin of the American Physical Society
75th Annual Meeting of the Southeastern Section of APS
Volume 53, Number 13
Thursday–Saturday, October 30–November 1 2008; Raleigh, North Carolina
Session NC: Particle Physics |
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Chair: Reyco Henning, University of North Carolina Room: Holiday Inn Brownstone Lincoln |
Saturday, November 1, 2008 8:15AM - 8:27AM |
NC.00001: Two Dimensional Large Nc QCD at Finite Density Richard Galvez, Barak Bringoltz, Rajamani Narayanan The study of Quark Gluon Plasma (QGP) is within experimental reach at BNL and CERN. Lattice Field Theory is a non-perturbative method to study QCD at finite density thus providing a theoretical framework to analyze QGP. Progress towards an understanding of two dimensional QCD in the limit of large number of colors (Large Nc Limit) at finite density will be reported. The chiral condensate and the phase of the fermion determinant will play a central role in the analysis. [Preview Abstract] |
Saturday, November 1, 2008 8:27AM - 8:39AM |
NC.00002: Search for New Physics with Bs Mesons at CMS/LHC Giordano Cerizza The large cross section for the production of b-quarks in LHC's proton-proton collisions allows precision measurements of CP violation in the Bs meson system. The CMS experiment is well suited to search for new generations of quarks and forces between them (New Physics) complementary to the B-Factories in decay channels such as Bs $\to $ J/$\Psi \quad \phi $. New Physics could significantly alter CP observables with respect to their predicted values in the Standard Model. We report on simulation studies of the channel Bs $\to $ J/$\Psi \quad \phi $. The extraction of CP parameters from the proper lifetime distribution relies strongly on the CMS pixel detector. It is mounted closely to the interaction point and has an unprecedented about 60 Million readout channels. At present this detector is commissioned in the CMS detector and will be exposed to first proton-proton collisions in fall of this year. We present the detector and first operational experiences. [Preview Abstract] |
Saturday, November 1, 2008 8:39AM - 8:51AM |
NC.00003: Randoms Counter Analysis Winston Hensley, Kevin Giovanetti A 1 ppm precision measurement of the muon lifetime is being conducted by the MULAN collaboration. The reason for this new measurement lies in recent advances in theory that have reduced the uncertainty in calculating the Fermi Coupling Constant from the measured lifetime to a few tenths ppm. The largest uncertainty is now experimental. To achieve a 1ppm level of precision it is necessary to control all sources of systematic error and to understand their influences on the lifetime measurement. James Madison University is contributing by examine the response of the timing system to uncorrelated events, randoms. A radioactive source was placed in front of paired detectors similar to those in the main experiment. These detectors were integrated in an identical fashion into the data acquisition and measurement system and data from these detectors was recorded during the entire experiment. The pair were placed in a shielded enclosure away from the main experiment to minimize interference. The data from these detectors should have a flat time spectrum as the decay of a radioactive source is a random event and has no time correlation. Thus the spectrum can be used as an important diagnostic in studying the method of determining event times and timing system performance. [Preview Abstract] |
Saturday, November 1, 2008 8:51AM - 9:03AM |
NC.00004: Adaptation of a Fortran-Based Monte-Carlo Microscopic Black Hole Simulation Program to C++ Based Root C.M. Jenkins, R. Godang, M. Cavaglia, L. Cremaldi, D. Summers The 14 TeV center of mass proton-proton collisions at the LHC opens the possibility for new Physics, including the possible formation of microscopic black holes. A Fortran-based Monte Carlo event generator program called CATFISH (\textbf{C}ollider gr\textbf{A}vi\textbf{T}ational \textbf{FI}eld \textbf{S}imulator for black \textbf{H}oles) has been developed at the University of Mississippi to study signatures of microscopic black hole production (http://www.phy.olemiss.edu/GR/catfish). This black hole event generator includes many of the currently accepted theoretical results for microscopic black hole formation. High energy physics data analysis is shifting from Fortran to C++ as the CERN data analysis packages HBOOK and PAW are no longer supported. The C++ based root is replacing these packages. Work done at the University of South Alabama has resulted in a successful inclusion of CATFISH into root. The methods used to interface the Fortran-based CATFISH into the C++ based root will be presented. Benchmark histograms will be presented demonstrating the conversion. Preliminary results will be presented for selecting black hole candidate events in 14 TeV/ center of mass proton-proton collisions. [Preview Abstract] |
Saturday, November 1, 2008 9:03AM - 9:15AM |
NC.00005: The mass, energy, space and time system theory of universe -MEST Dayong Cao Things have their own system of mass, energy, space and time of themself. (The MEST for short thereinafter). Mass is density, energy is force, time is frequency, spac is amplitude square. In MEST of White hole, Mass-energy particle condense to center, Space-time wave radiate to Around. Solar system is a MEST of White hole. Sun is mainly mass-energy; light wave mainly is space-time. Light is Around Sun. In wave-particle duality, the wave mainly is quantum space-time; The particle is mainly quantum mass-energy. There are the transmutation between space-time and mass-energy. When they get a balance, they get the inertia and eigenvalue system. In MEST of Black hole, Space-time particle condense to center, Mass-energy wave radiate to Around. The Dark matter-energy is from the Black hole. It is the radiate mass-energy Wave around Black hole. The dark matter-energy is from the Black hole like that the light wave is from star. Black hole have many dark planets who is made up of dark matter-energy like that Sun have many planets. There is a interaction between Back hole and White hole. In MEST of Back hole and White hole, There are the transmutation between space-time and mass-energy. There is a interaction between space-time and mass-energy. When they get a balance, they get a steady-going system like Homeostasis. There are the conservation of space-time and mass-energy. [Preview Abstract] |
Saturday, November 1, 2008 9:15AM - 9:27AM |
NC.00006: Derivation of the Fine Structure Constant Ramiro Montalvo A geometrically based calculation of the fine structure constant alpha is presented based on the known properties of the electromagnetic (EM) field and assumptions on the way the photon field may be quantized. Based on the fact that the photon field of a stationary charge has an energy density given by $\varepsilon _{0}$E(r)$^{2}$/2 around the charge, a radial photon field of stationary states is assumed which then interacts with the photon field of other charges . From the geometry of the configuration the interacting states are those along the line joining the two charges. Using the uncertainty principle to determine the angular extent of the interacting photons , the EM coupling constant $\alpha $ becomes the ratio of the interacting photons over all the photons around the sphere for one charge times the same ratio for the other charge. The answer reduces to $\alpha $ = [(14/75)(5)$^{1/2}$ - 1/3]$^{2}$ = .007067 which differs from the experimental value by 3.2{\%}. [Preview Abstract] |
Saturday, November 1, 2008 9:27AM - 9:39AM |
NC.00007: Fiber Optics at the JLab CLAS12 Detector John Kroon, Kevin Giovanetti The performance of wavelength shifting fibers, WLS, and method of coupling these fibers to extruded polystyrene scintillators are currently under study at James Madison University. These components are two of the main elements for the PCAL, preshower calorimeter, proposed as part of the 12 GeV upgrade for the CLAS detector at Jefferson Laboratory. The WLS fibers have been prepared, optically coupled to scintillator, and tested in order to determine their overall performance as a method of readout. Methods of coupling fiber to scintillator, a description of the test setup, test methods, PCAL readout performance, and fabrication recommendations will be presented. [Preview Abstract] |
Saturday, November 1, 2008 9:39AM - 9:51AM |
NC.00008: Searching for Isospin Violation at the Upsilon(4S) at BABAR Romulus Godang, Lucien Cremaldi, Don Summers Isospin violation at the Upsilon(4S) resonance is an important input for many B meson measurements at B factories. Isospin violation at Upsilon(4S) resonance may be at the level of a few percent mostly due to electromagnetic interactions and the mass different of the up and the down quarks. In this paper, we reconstruct neutral B meson in the channel D* Lepton Neutrino using a partial reconstruction method. Based on a data sample of 514 million B pairs collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we discuss a model independent measurement of the branching fraction of Upsilon(4S) decays to neutral B pairs. [Preview Abstract] |
Saturday, November 1, 2008 9:51AM - 10:03AM |
NC.00009: Search For the Rare Decay $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$ David Phillips Using data collected by the KTeV Experiment at Fermi National Accelerator Laboratory in Batavia, Illinois, this study will be the first experimental analysis of $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$. Although this decay mode is possible within the Standard Model, it is limited to a very narrow band of phase space. The HyperCP Experiment has recently observed three $\Sigma^{+}\rightarrow{\it p}\mu^{+}\mu^{-}$ events within a narrow dimuon mass range of 213.8 MeV/$c^{2}$ to 214.8 MeV/$c^{2}$. This suggests that the process occurs via a neutral intermediary particle, $\Sigma^{+}\rightarrow{\it p}X^{0}\rightarrow{\it p}\mu^{+}\mu^{-}$, with an $X^{0}$ mass of 214.3 MeV/$c^{2}$$\pm$0.5 MeV/$c^{2}$. Since the $X^{0}$ has a light mass and a low interaction probability, then it is not feasible within the Standard Model. However, the $X^{0}$ could be explained by a theory known as the ``Next-to-Minimal Supersymmetric Standard Model'' (NMSSM). In NMSSM, there are seven Higgs bosons and theorists believe that the $X^{0}$ may be the lightest of this group. Recent theoretical predictions suggest that the decay mode $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$ can also occur via the aforementioned neutral intermediary particle: $K_{L}\rightarrow\pi^{0}\pi^{0}X^{0}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$. Therefore, in addition to a Standard Model measurement, the search for $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$ is also carried out in an effort to address the viability of $X^{0}$ in explaining the HyperCP phenomena. [Preview Abstract] |
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