Time reversal violation in radiative beta decay

ORAL

Abstract

Some explanations for the excess of matter over antimatter in the universe involve sources of time reversal violation (TRV) in addition to the one known in the standard model of particle physics. We plan to search for TRV in a correlation between the momenta of the beta, neutrino, and the radiative gamma sometimes emitted in nuclear beta decay. Correlations involving three momenta are sensitive at lowest order to different TRV physics than observables involving spin, such as electric dipole moments. Similar experiments have been done in radiative kaon decay, but not in systems involving the lightest generation of quarks. The explicit low-energy physics model being tested [Gardner and He, Phys. Rev. D 87 116012 (2013)] produces effects in the Fermi beta decay of the neutron, tritium, and some positron-decaying isotopes. We will try to measure the TRV asymmetry in radiative beta decay of laser-trapped $^{38m}$K at better than 0.01 sensitivity, and we will describe solutions to measure radiative gammas in the presence of background from positron annihilation.

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Authors

  • J.A. Behr

    TRIUMF

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University

  • Mike Smith

    University of Kentucky, Michigan State University, University of Guelph, TRIUMF, Colorado School of Mines, Simon Fraser University, University of Texas at Dallas, Washington State University, Okinawa Institute of Science and Technology Graduate University, Japan, Institute for Quantum Science and Technology, University of Calgary, University of British Columbia, School of Physics and Astronomy, Tel Aviv U., Cyclotron Institute and Dept. of Physics and Astronomy, Texas A\&M U., Dept. of Physics and Astronomy, U. Manitoba, Dept. of Physics and Astronomy, U. British Columbia, TRIUMF, Vancouver, British Columbia, Department of Physics and Astronomy, University of Calgary, Institut f{\"u}r Kernphysik, Westf{\"a}lische Wilhelms-Universit{\"a}t, M{\"u}nster, Germany, Simon Fraser U./TRIUMF, U. British Columbia/TRIUMF, MPIK/TRIUMF, U. Manitoba, U. Surrey, TRIUMF/U. British Columbia, U. Manitoba/TRIUMF, McGill U., Simon Fraser U., Queen Mary University of London, Harvard University, University of Lethbridge, Georgia Institute of Technology, St. Mary's University, University of Washington, University of Auckland, Central Washington University