Bulletin of the American Physical Society
79th Annual Meeting of the APS Southeastern Section
Volume 57, Number 16
Wednesday–Saturday, November 14–17, 2012; Tallahassee, Florida
Session MB: Particle Physics II |
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Chair: Roxanne Springer, Duke University Room: DoubleTree Salon AB |
Saturday, November 17, 2012 10:45AM - 10:57AM |
MB.00001: Preliminary results from Mississippi State Axion Search Prajwal Mohanmurthy, Robertsen Riehle, Dipangkar Dutta Mississippi State Axion Search is an exotic particle search experiment using a novel light shining through a wall technique. The experimental setup consists of two tuned vacuum cavities placed under a very strong magnetic field and separated by a wall. While one of the cavities houses a strong EM field generator, the other (dark) cavity houses the detector systems. The electronics consists of multi-stage amplifier system, each based on $SR-510$ lock in amplifiers and $PCI-D$ high speed data cards. The experiment is scheduled to run up to April 2013. The theory leading up to light axions will be previewed highlighting different experimental approaches to search for axions which spans 8 orders of magnitude in mass and a wide plethora of experiments investigating each approach, with their results, will be discussed. Projected sensitivity of MASS for light axions and para-photons besides certain other candidate dark matter particles will be illustrated showing its impact on a wider scale amongst other low cost axion search experiments. Results from the systematics and background studies will be presented. [Preview Abstract] |
Saturday, November 17, 2012 10:57AM - 11:09AM |
MB.00002: Search for Axions in the 70cm Range Robertsen Riehle In 1967 Andrei Sakharov introduced three conditions to produce a universe with a non-zero baryon number. One of those conditions was that charge and charge-parity (CP) symmetry needed to be violated. CP symmetry has not observed in the strong sector although the Standard Model of Particle Physics allows it. In 1977, Peccei and Quinn proposed a solution to this this low upper bound on the observed strong force CP violation. The solution required a new particle called an axion. Finding and understanding the axion could solve the strong CP problem. The MASS experiment at Mississippi State University utilizes a dipole magnet, a radio field and a conducting wall dividing an evacuated cavity into two. If axions are present, they could be observed beyond the wall in the ``dark'' end of the cavity. This experiment is still in building and testing phase. [Preview Abstract] |
Saturday, November 17, 2012 11:09AM - 11:21AM |
MB.00003: Vector Currents of Massive Neutrinos of an Electroweak Nature Rasulkhozha Sharafiddinov The mass of an electroweakly interacting neutrino consists of the electric and weak parts responsible for the existence of its charge, charge radius and magnetic moment. Such connections explain the formation of paraneutrinos, for example, at the polarized neutrino electroweak scattering by spinless nuclei. We derive the structural equations which relate the self components of mass to charge, charge radius and magnetic moment of each neutrino as a consequence of unification of fermions of a definite flavor. They indicate to the availability of neutrino universality and require follow its logic in a constancy law dependence of the size implied from the multiplication of a weak mass of neutrino by its electric mass. According to this principle, all Dirac neutrinos of the vector nature regardless of the difference in masses, have the same charge, an identical charge radius as well as an equal magnetic moment. Thereby, it opens the possibility for establishment of the laboratory limits of weak masses of the investigated types of neutrinos. Finding estimates show clearly that the earlier measured properties of these particles may testify in favor of the unified mass structure of their interaction with any of the corresponding types of gauge fields. [Preview Abstract] |
Saturday, November 17, 2012 11:21AM - 11:33AM |
MB.00004: Particle Trapping in Stable Islands of Transverse Phase Space Christopher Frye At CERN, particles are transferred from the Proton Synchrotron (PS) to the Super Proton Synchrotron (SPS) as they accelerate to high energies for subsequent fixed target or neutrino experiments. Since the SPS has a circumference eleven times that of the PS, beams from the PS must be ``stretched out'' in order to fill the SPS. Traditional methods of carrying out this beam transfer, such as fast extraction and continuous transfer, create either strong transient effects (fast extraction) or suffer from large losses of particles during transfer and a lack of control over optical parameters of the extracted beam (continuous transfer). As a result, a novel method called multi-turn extraction (MTE) has been investigated and implemented in recent years, in which nonlinear magnetic fields create stable islands in the beam's horizontal phase space, thus separating the beam into parts for clean extraction. We analyze, both analytically and through simulations, a simple model of this phenomenon in order to understand the separate effects of moving and enlarging these phase-space islands. We then apply our conclusions to optimize beam-splitting in a more realistic model. [Preview Abstract] |
Saturday, November 17, 2012 11:33AM - 11:45AM |
MB.00005: Production of Two Heavy Quarks With Different Masses at One-loop with Eikonal Approximation Elwin Martin, Nikolaos Kidonakis The eikonal approximation provides a powerful tool for calculating hard scattering cross sections in QCD. In particular, we consider the exchange of soft-gluons between quarks in hard scattering. We present the results for the one loop calculation for two quark production with different masses. These calculations begin with the Feynman diagram and use the eikonal approximation for soft-gluon emission. The integration is then Feynman parametrized and the UV poles are isolated. The UV structure also allows us to recover the results for quark-antiquark production. [Preview Abstract] |
Saturday, November 17, 2012 11:45AM - 11:57AM |
MB.00006: Deconfinement Transition in Equilibrium Lattice Gauge Theory with Realistic Boundary Conditions Hao Wu, Bernd Berg Heavy-ion collision experiments carried out at the Brookhaven National Laboratory provide evidence that matter can be driven from a confined, low-temperature phase into a deconfined high-temperature phase of liberated quarks and gluons. Understanding of the deconfinement transition can bring our knowledge of strongly-interacting matter to a deeper level. {\it Ab initio} equilibrium studies of the thermodynamic equation of state in the deconfined phase are possible in the framework of lattice gauge theory. It is most desired in such studies to work on as large lattices as possible in order to approach the infinite volume thermodynamic limit. To accomplish it quickly, most of them have implemented periodic boundary conditions on the physical systems. However, the physical volumes created at the Brookhaven National Laboratory are small and exploratory work for pure $SU(3)$ lattice gauge theory suggests that boundary effects cannot be neglected. In this work we studied the $SU(3)$ deconfined equilibrium phase in small volumes with inside and outside temperatures in the $SU(3)$ scaling region, using a lattice geometry of the double-layered torus. Our results show substantial finite size effects on the deconfining transition temperature under realistc boundary conditions. [Preview Abstract] |
Saturday, November 17, 2012 11:57AM - 12:09PM |
MB.00007: Creating a Public Data Access Website for Double Chooz Maya Carter My talk describes the creation of a public data access webpage that will allow people unaffiliated with the Double Chooz experiment to understand exactly how the value of $\theta _{13}$ (the final mixing angle for neutrino oscillation) was measured by the experiment. Double Chooz is a two detector neutrino experiment based in Chooz, France that has run since 2011. The website has all the final values found by Double Chooz and the fitting macros that found those values. I will explain the method used for choosing which macros and how much information went up on the website. [Preview Abstract] |
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