Bulletin of the American Physical Society
2007 APS Four Corners Section/SPS Zone 16 Joint Fall Meeting
Volume 52, Number 14
Friday–Saturday, October 19–20, 2007; Flagstaff, Arizona
Session J3: Particles and Fields |
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Chair: Keith Dienes, University of Arizona Room: Chemistry (Bldg. 20) Room 233 |
Saturday, October 20, 2007 11:00AM - 11:12AM |
J3.00001: Effective Field Theories for Kaluza-Klein Modes Sky Bauman In a collider experiment, the appearance of a tower of Kaluza-Klein particles would be the signature of an extra dimension. Relations between parameters characterizing a Kaluza-Klein tower are readily predicted when quantum effects are ignored. For example, a single flat extra dimension compactified to a circle leads to Kaluza-Klein modes whose masses are integral multiples of the compactification scale and whose couplings are universal. However, radiative corrections renormalize masses and couplings. In this talk, I investigate the extent to which such corrections distort tree-level relations for Kaluza-Klein spectra. As toy models, I consider a five-dimensional scalar $\phi^4$ model and a five-dimensional Yukawa theory involving both scalars and fermions. One unexpected result is that the squared masses of the fermions in Yukawa theory receive corrections which actually grow with mode number. Another is that a $\gamma^5$ interaction is induced in this theory. Although small, such corrections may lead to observable effects at future colliders. These computations were possible only with new calculational techniques I developed for Kaluza-Klein theories. I will discuss these methods, along with their implications for other calculations. [Preview Abstract] |
Saturday, October 20, 2007 11:12AM - 11:24AM |
J3.00002: Generating Order 2 and 4 Free-Fermionic NAHE-Based Heterotic Models Jared Greenwald Starting with a short overview of string phenomenology we then motivate our search of the free-fermionic heterotic string models. We generate all possible order 2 and 4 boundary vectors which can be added to the NAHE set and still form a consistent MSSM string model. We discuss briefly how they are generated and how they are used to study the corresponding gauge groups. [Preview Abstract] |
Saturday, October 20, 2007 11:24AM - 11:36AM |
J3.00003: Oscillation Amplitude for Neutrino Wave Packets Luca Visinelli We present an expression for the transition amplitude between two neutrino flavors in terms exclusively of the neutrinos' mass eigenstates. The analysis followed does not contain any theory concerning neutrino production and detection processes. However, the final expression for the amplitude found happens to behave consistently with other formulas obtained in different ways, and shows the correct ultra-relativistic limit studied by Pontecorvo. A numerical analysis is performed to show the behavior for the expression in the case of two neutrino generations. [Preview Abstract] |
Saturday, October 20, 2007 11:36AM - 11:48AM |
J3.00004: Directional recoil rate for direct detection of WIMPs Moqbil Alenazi, Paolo Gondolo The problem of directional direct detection of weakly interacting massive particles (WIMPs) dark matter (DM) is investigated. We compute, analytically and numerically, the directional differential recoil rate $\frac{dR}{d\cos\theta}$ of recoiled target nuclei hit by WIMPs in direct detection experiments in terms of the angle $\theta$, which is the angle between the reference direction and the recoil direction. While the analytic method is for fixed reference direction and Gaussian distribution of WIMPs, the numeric method is a general method. The two methods give the same results. We apply the numeric method to various Maxwellian distributions including; a stream of WIMPs, the standard dark halo, streams of WIMPs from Sikivie's late-infall (SLI) halo model, and streams with anisotropic velocity distributions. We show the results as distributions of the nuclei's directional differential recoil rate $\frac{dR}{d\cos\theta}$ as a function of $\cos\theta$. We introduce a `folded' directional differential recoil rate $\frac{dR}{d|\cos\theta|}$ to overcome the difficulty of head-tail discrimination in some WIMP's direct detectors. We conclude that $\frac{dR}{d|\cos\theta|}$ can be helpful in recognizing cases of anisotropic streams and isotropic standard dark halo but not in the case of SLI streams. [Preview Abstract] |
Saturday, October 20, 2007 11:48AM - 12:00PM |
J3.00005: Signals for Lorentz Violation in Gravitational Experiments Quentin Bailey In recent years there has been growing interest in high-precision tests of Lorentz symmetry. This is motivated primarily by the possibility of uncovering experimental glimpses of a fundamental theory. The Standard-Model Extension (SME) offers a comprehensive theoretical framework describing general Lorentz violation while incorporating known physics. In this talk, results from the gravitational sector of the SME are discussed. The application of these results to a variety of modern gravity experiments shows promising sensitivity to gravitational coefficients for Lorentz violation. [Preview Abstract] |
Saturday, October 20, 2007 12:00PM - 12:12PM |
J3.00006: Electrodynamic Image Problem of a Moving Charge and a Conducting Sphere Using Conformal Transformations Himal Rathnakumara, Manuel Berrondo The problem of the radiation emitted by a charge approaching a conducting sphere is transformed into a dynamic image problem. The solution is henceforth found using conformal transformations in the Clifford algebra formalism. The pivotal point is the concept of the inverse of a vector illustrated first with the static spherical image textbook problem. [Preview Abstract] |
Saturday, October 20, 2007 12:12PM - 12:24PM |
J3.00007: Inertia (mass) as a relativistic property of a fundamental wavefunction. Alexander Panin Origin of mass of a matter is still a mystery. After four decades of search the existence of Higg's boson still is not confirmed experimentally. Alternative mechanism of generating mass is proposed here. A standing wave consisting of two fundamental wavefunctions expi(wt-kx) and expi(wt+kx) naturally acquires property we call inertial mass just as the result of Lorentz transformations (from the reference frame of the standing wave to the reference frame of a moving by the wave observer). Another by-product of these transformations is De Broglie wavelength of the spatial distribution of amplitude of such standing wave (as seen from the frame of moving by it observer). Relativistic wave in more than 1 spatial dimension (cylindrical and spherical wave) has angular momentum which can be associated with spin. So it is not impossible that what we call ``elementary particles'' are actually systems of massless relativistic waves. [Preview Abstract] |
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