Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session S12: Flavor Physics: Charged Leptons and Updates |
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Sponsoring Units: DPF Chair: Nicholas Hadley, University of Maryland Room: 100 |
Monday, April 7, 2014 1:30PM - 1:42PM |
S12.00001: Analyzing KOTO Data With Correlation Coefficients Duncan Mcfarland, Joseph Comfort The KOTO experiment is underway at the JPARC laboratory to measure the branching ratio for the $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$ decay. The ratio provides a direct measure of Standard Model parameter that is responsible for CP violation, and the SM prediction of $2.4 \times 10^{-11}$ has small uncertainties. Two-photon events will be detected in a large array of 2716 CsI crystals, surrounded by veto detectors to suppress backgrounds. The raw signals are filtered to produce Gaussian-shaped peaks and digitized to provide both energy and time information. Sensitivity to very small signals is needed. We have developed a method that leverages the nearly constant peak shape to distinguish real signals from noise with high reliability.\footnote{D. Bylth. M. Gibson, D. Mcfarland, and J.R. Comfort, Nucl.\ Instrum.\ Methods A {\bf 738}, 206 (2014).} Its use and performance will be applied to the analysis of early data from a 2013 run. [Preview Abstract] |
Monday, April 7, 2014 1:42PM - 1:54PM |
S12.00002: Searching for Heavy Photons with TREK Peter Monaghan Experiment TREK/E36 at J-PARC to test lepton flavor universality and to search for new particles is expected to run in 2015. The possibility of a massive dark photon opens up new avenues of physics beyond the standard model. The motivation for the existence of photon-like gauge bosons can be seen in the observed positron excess in the universe, occuring via dark matter annihilation; through the muon anomalous magnetic moment, where theory and experiment disagree; through the proton radius puzzle, where the discrepancy between measurements of electronic and muonic hydrogen could be reconciled with a neutral gauge boson with selective coupling. This talk explores the opportunity to search for a neutral gauge boson in rare kaon decay channels. An in-depth look at a such a search with experiment E36 at the J-PARC facility in Japan will be presented. [Preview Abstract] |
Monday, April 7, 2014 1:54PM - 2:06PM |
S12.00003: Producing a Precision Magnetic Field in the Muon $g-2$ Experiment at Fermilab Brendan Kiburg A new effort to measure the muon's anomalous magnetic moment is currently underway at Fermilab. The 3.6 $\sigma$ discrepancy between theoretical calculations of the muon's anomalous magnetic moment and the Brookhaven E821 measurement motivates this experiment. The main systematic uncertainties are related to the detection of the decay positron produced in muon decay, and the production and measurement of the precision magnetic field in the muon storage ring. To reach the precision goal of 140 ppb, the muon $g-2$ experiment will implement several upgrades to the E821 approach and collect 20 times as many muons. This talk will give a brief overview of the experimental status. The upgrades associated with the production and measurement of the highly uniform magnetic field will be described. [Preview Abstract] |
Monday, April 7, 2014 2:06PM - 2:18PM |
S12.00004: A SQUID-based $^3$He Co-magnetometer Readout for the SNS nEDM Experiment Young Jin Kim, Steven Clayton A discovery of a permanent electric dipole moment (EDM) of the neutron would provide one of the most important low energy tests of the discrete symmetries beyond the Standard Model of particle physics. A new experimental neutron EDM search, to be conducted at the Spallation Neutron Source (SNS) at ORNL, has been proposed to improve the present experimental limit of 10$^{-26}$ e$\cdot$cm by two orders of magnitude. The experiment is based on the magnetic-resonance technique in which polarized neutrons precess at the Larmor frequency when placed in a static magnetic field; a non-zero EDM would be evident as a difference in precession frequency when a strong electric field is applied parallel vs. anti-parallel to the magnetic field. In addition to its role as neutron spin-analyzer via the spin-dependent n+$^3$He nuclear capture process, polarized helium-3 (which has negligible EDM) will serve as co-magnetometer to correct for drifts in the magnetic field. The helium-3 magnetization signal will be read out by superconducting gradiometers coupled to SQUIDs. We describe a proposed SQUID system suitable for the complex neutron EDM apparatus, and demonstrate that the field noise in the SQUID system, tested in an environment similar to the EDM apparatus, meets the nEDM requirement. [Preview Abstract] |
Monday, April 7, 2014 2:18PM - 2:30PM |
S12.00005: Study of $b$ baryons using D0 Run II data Jose Andres Garcia We present a search for $b$ baryons decaying into $J/\psi$ final states using the full D0 Run II dataset, corresponding to an integrated luminosity of 10.4 fb$^{-1}$ of proton-antiproton collisions. The search includes the channels $\Xi_b^- \to J/\psi\, \Xi^-$ and $\Omega_b \to J/\psi\, \Omega^-$. We extract the lifetimes of these states using the resulting signals, and compare to predictions from theory, and to existing results from CDF. [Preview Abstract] |
Monday, April 7, 2014 2:30PM - 2:42PM |
S12.00006: Further Investigation for Exotic Strucutres in the $J/\psi\phi$ Mass Spectrum from Exclusive B decays Suleyman Durgut Heavy quarkonium spectroscopy provides insight into strong interactions that are not precisely predictable by QCD theory. The structure Y(4140) observed at CDF, D0 and CMS cannot be explained by classical quarkonia model. The previous analysis of $J/\psi\phi$ mass spectrum in exclusive $B^{+}\rightarrow J/\psi\phi K^{+}$ decay is based on 2011 dataset at CMS, where $J/\psi\rightarrow\mu^{+}\mu^{-}$ and $\phi\rightarrow K^{+}K^{-}$. We further update this analysis using 2011 data at $\sqrt{s}=7 TeV$ and 2012 data at $\sqrt{s}=8 TeV$ together. [Preview Abstract] |
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