Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session DK: Mini-Symposium on Probing Fundamental Symmetries with Nuclei, Neutrons, Muons, and Atoms II |
Hide Abstracts |
Chair: Jiro Murata, Rikkyo University Room: Queens 5 |
Thursday, October 15, 2009 7:00PM - 7:15PM |
DK.00001: $ft$ value of the mirror nucleus $^{19}$Ne Smarajit Triambak The mirror nucleus $^{19}$Ne provides excellent opportunity to probe for physics beyond the Standard Model. The decay of polarized $^{19}$Ne has been studied previously to set limits on right-handed and second-class currents, beyond the minimal Standard Model. In addition, the best experimental limit on T-violating interactions from weak decays also comes from the decay of $^{19}$Ne. In this talk we will present preliminary results from a recent experiment performed at TRIUMF to measure the $ft$ value of the decay of $^{19}$Ne with improved precision. This result will allow for more stringent constraints on exotic interactions that are not predicted by the Standard Model. [Preview Abstract] |
Thursday, October 15, 2009 7:15PM - 7:30PM |
DK.00002: The NPDGamma experiment - A measurement of parity violation in polarized cold neutron capture Nadia Fomin The NPDGamma experiment aims to measure the correlation between the neutron spin and the direction of the emitted photon in neutron-proton capture. An up-down parity violating asymmetry from this process can be directly related to the strength of the hadronic weak interaction between nucleons. The first phase of the experiment was completed in 2006 at LANSCE. The methodology will be discussed and preliminary results will be presented. The next run will start in late 2009 at the SNS at ORNL with several improvements, which will be discussed. The upcoming run will yield a measurement with a projected statistical error 1x10$^{-8}$. This will finally allow the result can be compared with theoretical predictions. [Preview Abstract] |
Thursday, October 15, 2009 7:30PM - 7:45PM |
DK.00003: The n-${}^3$He experiment at the SNS Christopher Crawford The n-${}^3$He experiment will measure the parity violating proton asymmetry with longitudinally polarized neutrons in the reaction $\vec{\mbox{n}} + {}^3$He $\to$ ${}^3$H + p. As part of an ongoing program to experimentally characterize the hadronic weak interaction (HWI), this experiment is approved to run at the Fundamental Neutron Physics Beamline (FnPB) at the SNS following the NPDGamma experiment in 2011. Components being constructed for this experiment include an innovative resonant spin rotator for longitudinally polarized neutrons; and a ${}^3$He gas target which also functions as an ion chamber to detect the proton asymmetry. Preliminary calculations indicate that this experiment will provide one of the most sensitive measurements of a hadronic parity violating observable in a few-body system. [Preview Abstract] |
Thursday, October 15, 2009 7:45PM - 8:00PM |
DK.00004: ABSTRACT WITHDRAWN |
Thursday, October 15, 2009 8:00PM - 8:15PM |
DK.00005: A new Muon-to-Electron Conversion Experiment at J-PARC Ed Hungerford A new experimental search for coherent, neutrinoless, muon-to-electron conversion from a muonic atom has been proposed for the Japanese Proton Accelerator, J-PARC, now under commissioning. The experiment is completing a conceptual design which proposes a single event sensitivity in the branching ratio of lepton number violating to lepton conserving decays of approximately 2.6 x 10$^{-16}$. This talk briefly describes the experiment and its objectives. [Preview Abstract] |
Thursday, October 15, 2009 8:15PM - 8:30PM |
DK.00006: $\pi^0$ to two-photon decay in lattice QCD Eigo Shintani $\pi^0\rightarrow\gamma\gamma$ decay, which is induced by the axial anomaly. Using the overlap fermion we explicitly calculate the amplitude for the $\pi^0 \rightarrow\gamma^*\gamma^*$ process. Our result nicely reproduces the prediction from the axial anomaly in the on-shell limit thanks to the exact chiral symmetry on the lattice, and also give a useful information for the lattice calculation of hadronic light-by-light scattering diagram for muon g-2. [Preview Abstract] |
Thursday, October 15, 2009 8:30PM - 8:45PM |
DK.00007: Overview of Jefferson Lab's $Q_{Weak}$ Experiment David Mack Precision measurements of Standard Model-suppressed, weak-scale observables provide a window on potential new physics. An attractive observable which has never been directly measured is the proton neutral weak charge, $Q_{Weak}^p$, which measures the coupling of the Z boson to the proton. Because $Q_{Weak}^p$ is proportional to the small quantity $1 - 4\sin^2\theta_W$ at tree level, new parity-violating electron-quark interactions at the TeV scale could be revealed by an experiment with our modest 4\% projected uncertainty. By measuring the parity-violating asymmetry in elastic $e+p$ scattering at low momentum transfer, and utilizing bounds from the world's strange quark form factor program, the proton weak charge can be determined with relatively small hadronic interpretational ambiguities. After overviewing the physics case and the status of our construction efforts, commissioning activities and the time- scale for production data taking will be discussed. [Preview Abstract] |
Thursday, October 15, 2009 8:45PM - 9:00PM |
DK.00008: The Parity Violating Asymmetries of Backgrounds in the $Q_{weak}$ Experiment Katherine Myers The $Q_{weak}$ Collaboration at Jefferson Lab will perform the first direct measurement of the proton's weak charge, $Q^p_W$, to a precision of 4\%. At tree level, the weak mixing angle is related to the weak charge of the proton by $Q^p_W$=1-4$\sin^2\theta_W$, leading to a 0.3\% measurement of $\sin^2\theta_W$ at low energy - making this the best low energy measurement to date. The parity-violating asymmetry in elastic electron-proton scattering will be measured and is expected to be small, $\sim$ 250 ppb. To reach the experimental goals, systematic uncertainties must be measured precisely. One particular systematic uncertainty is background contributions to the experimental asymmetry. $Q_{weak}$ will take data in integrating mode, which requires that the asymmetry-weighted backgrounds be well understood. The largest source of asymmetry-weighted background is expected to come from the target windows. Elastic e-Aluminum and e-Beryllium yields and parity-violating asymmetries must therefore be measured to subtract target window background contributions to the measured asymmetry. The simulation of these window asymmetries and other backgrounds will be discussed. [Preview Abstract] |
Thursday, October 15, 2009 9:00PM - 9:15PM |
DK.00009: Test of Newtonian gravity at short range using pico-precision displacement sensor Takashi Akiyama, Maki Hata, Kazufumi Ninomiya, Hironori Nishio, Naruya Ogawa, Yuta Sekiguchi, Kentaro Watanabe, Jiro Murata Recent theoretical models of physics beyond the standard model, including attempts to resolve the hierarchy problem, predict deviations from the Newtonian gravity at short distances below millimeters. Present NEWTON project aims an experimental test of the inverse-square law at the millimeter scale, using a torsion pendulum with a pico-precision displacement sensor, which was originally developed for the micron precision optical alignment system (OASys) for the PHENIX muon tracking chambers at RHIC, using digital image analysis technique. In order to examine the gravitational force at short range scale around micrometers, we have developed a new apparatus NEWTON-III, which can determine the local gravitational acceleration by measuring the motion of the torsion pendulum. In this presentation, the development status and the results of the NEWTON-experiment will be reported. [Preview Abstract] |
Thursday, October 15, 2009 9:15PM - 9:30PM |
DK.00010: The New Muon (g-2) Experiment at Fermilab Dinko Pocanic We discuss a new proposal to measure $a_\mu$, the muon anomalous magnetic moment, to 0.14 ppm at Fermilab, a fourfold improvement over the 0.54 ppm precision obtained in the BNL experiment E821. The muon anomaly is a fundamental quantity whose precise determination will have lasting value. We plan to use the unique FNAL complex of accelerators and rings to produce high-intensity bunches of muons, to be directed into the relocated BNL muon ring. The physics goal of the experiment, $\delta a_\mu = 16 \times 10^{-11}$, will require 21 times the statistics of the BNL measurement, and a 3$\times$ reduction of the systematic error. Our goal is well matched to the anticipated advances in the effort to determine the standard model (SM) value of the anomaly. The present comparison, $\Delta a_\mu ({\rm Expt.\ - SM}) = 295(81) \times 10^{-11}$, is already suggestive of possible new contributions to the muon anomaly. Assuming a 40\% reduction of the current theory error, the combined uncertainty with our projected final result would be $\approx 31 \times 10^{-11}$, a sensitive and complementary benchmark for proposed SM extensions. The experimental data will also be used to improve the muon EDM limit by up to a factor of 100, and to make a higher-precision test of Lorentz and CPT violation. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700