Bulletin of the American Physical Society
9th Annual Meeting of the Northwest Section of the APS
Volume 52, Number 6
Thursday–Saturday, May 17–19, 2007; Pocatello, Idaho
Session B3: Particle Physics |
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Chair: James Brau, University of Oregon Room: PSUB Clearwater Room |
Friday, May 18, 2007 2:00PM - 2:40PM |
B3.00001: Radio Detection of Ultra High Energy Neutrinos Invited Speaker: Observation over the last 40 years of several dozen cosmic ray events with energies exceeding the Greisen-Zatsepin-Kuzmin (GZK) cutoff poses among the most intriguing and intractable problems in high energy astroparticle physics. This GZK process itself produces neutrinos that are strongly believed to be both spectrally and spatially correlated to high energy cosmic ray particles above 100 EeV. In the 1960's Askaryan predicted that the interaction of such high energy neutrinos would lead to coherent Cherenkov radiation due the spatially compact nature of such showers. In June 2006 Askaryan's predictions were verified for EeV showers in a 10 ton ice target at SLAC. A number of current and future experiments are now actively exploiting this radio detection method to search for the ``guaranteed'' flux of high energy neutrinos. The Antarctic Impulse Transient Antenna (ANITA) experiment, a long-duration balloon operating at an altitude of 37km, flew for over a month during Dec. 2006 - Jan. 2007 and a preliminary report on this flight will be presented. In the longer term, a large-scale terrestial radio array opens the possibility to probe deep inelastic neutrino-nucleon scattering at center of mass energies well above those of any proposed future collider. Two prototype systems were deployed in Antarctica this austral summer, and RF surveys of salt domes continue as will be shown. [Preview Abstract] |
Friday, May 18, 2007 2:40PM - 3:05PM |
B3.00002: Counting B Mesons at BaBar Grant McGregor The primary goals of the BaBar Collaboration are to probe the Standard Model of Particle Physics through high precision studies of Charge-Parity (CP) violation and rare B meson decays. The BaBar detector is located at the Stanford Linear Accelerator Center. To date, we have recorded over 300 million B meson decays. With such high statistics in the study of B decays and CP violation, it is of utmost importance to have an understanding of precisely how many B mesons are produced and the uncertainties in this number. This is because the B meson count is used as a normalization in the vast majority of B-physics analyses with BaBar. We report on recent work to understand in detail the number of B mesons recorded and to improve the efficiency and systematic uncertainties in B meson counting. [Preview Abstract] |
Friday, May 18, 2007 3:05PM - 3:25PM |
B3.00003: Coffee Break
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Friday, May 18, 2007 3:25PM - 3:40PM |
B3.00004: Search For Baryon number violation in tau lepton decays Casey Bojechko A search for baryon number violating decays of the $\tau$ lepton has been performed. Specifically decays involving three charged tracks one of which is a proton. Decays of interest are of the form $\tau \rightarrow p \pi \pi$ or $\tau \rightarrow l l$ where $l $ is either a $\mu$ or e lepton. The search was conducted using 384 $fb^{-1}$ of $e^ {+} e^{-}$ data collected from the BABAR detector at the SLAC PEP-II storage rings. No evidence of the signal has been found, upper limits on the branching fractions are found to be of on the order of $10^{-7}$. [Preview Abstract] |
Friday, May 18, 2007 3:40PM - 3:55PM |
B3.00005: High precision test of the equivalence principle Stephan Schlamminger, Todd Wagner, Ki-Young Choi, Jens Gundlach, Eric Adelberger The equivalence principle is the underlying foundation of General Relativity. Many modern quantum theories of gravity predict violations of the equivalence principle. We are using a rotating torsion balance to search for a new equivalence principle violating, long range interaction. A sensitive torsion balance is mounted on a turntable rotating with constant angular velocity. On the torsion pendulum beryllium and titanium test bodies are installed in a composition dipole configuration. A violation of the equivalence principle would yield to a differential acceleration of the two materials towards a source mass. I will present measurements with a differential acceleration sensitivity of $3\times 10^{-15}\;\mbox{m}/\mbox{s}^2$. [Preview Abstract] |
Friday, May 18, 2007 3:55PM - 4:10PM |
B3.00006: Electroweak Physics and the International Linear Collider James Brau One major achievement of Twentieth Century physics was the development of a precise theory of the electroweak interaction. Soon the Large Hadron Collider (LHC) will begin operations at CERN and confront the limits of this theory. The first indications of the physical basis for electroweak unification are anticipated. Recently the Global Design Effort released its Reference Design Report for the International Linear Collider (ILC), and is preparing the effort toward the ILC Engineering Design. The ILC is a critical facility for advancing Terascale physics discovery. [Preview Abstract] |
Friday, May 18, 2007 4:10PM - 4:25PM |
B3.00007: Correlations of Coupled Logistic Maps John Harrison, Gus Hart Most systems in the world around us are non-linear and often chaotic. Moreover, many systems influence or are influenced by other physical systems. Understanding the behavior of coupled chaotic systems is essential to understanding the many facets of the physical world of our everyday experience. The simplest chaotic system, the logistic map, shows unusual correlations when coupled to second logistic map. We use a Master--Slave coupling, where the first map influences the second, but not the other way. We observe two forms of correlation between the master and slave due to coupling strength. With low coupling the correlations are complex and very interesting. With higher values of coupling the two maps ``lock'', becoming synchronized. I intend to discuss some of the intricacies of the correlations at low couplings. [Preview Abstract] |
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