Bulletin of the American Physical Society
2019 Fall Meeting of the APS Division of Nuclear Physics
Volume 64, Number 12
Monday–Thursday, October 14–17, 2019; Crystal City, Virginia
Session KA: Nuclear Probes of Fundamental Symmetries |
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Chair: Vincenzo Cirigliana, LANL Room: Salon 1 |
Wednesday, October 16, 2019 8:30AM - 9:06AM |
KA.00001: Theoretical approaches to neutrinoless double beta decay from the ground up Invited Speaker: Amy Nicholson While the discovery of non-zero neutrino masses is among the most important accomplishments by physicists in the past century, it is still unknown how and in what form these masses arise. Lepton number-violating neutrinoless double beta decay is a natural consequence of Majorana neutrinos and many BSM theories, and, if observed, could potentially explain the matter/anti-matter asymmetry in the universe. Several experimental searches for these processes using nuclear sources are planned and/or underway worldwide, and understanding quantitatively how neutrinoless double beta decay would manifest in nuclear environments is key for interpreting any observed signals. In this talk I will give a brief overview of current theoretical approaches to understanding neutrinoless double beta decay from the microscopic BSM mechanisms, to the combined efforts of effective field theory and lattice QCD on quantifying few-hadron processes, to the many-body approaches necessary for calculating observables for experimentally relevant nuclei. [Preview Abstract] |
Wednesday, October 16, 2019 9:06AM - 9:42AM |
KA.00002: Calculations of nucleon EDMs on a lattice Invited Speaker: Sergey Syritsyn Electric dipole moments of the nucleons would be evidence of CP violation due to the QCD theta term or effective quark-gluon interactions induced by symmetry-breaking physics beyond the Standard Model. Upcoming experiments will improve precision of neutron EDM measurements by 1-2 orders of magnitude within the next decade. Corresponding improved constraints on (and eventual observation of) nucleon EDMs will have to be traced back to the quark-gluon level to be used as constraints on new particles and interactions. While low-energy theories and nucleon models provide ballpark estimates of nEDMs that can be produced by different kinds of CP violation in quark-gluon interactions, nonperturbative QCD calculations on a lattice are necessary to find precise and model-independent relations between them. Lattice QCD has reached a respectable level of statistical and systematic precision for hadron spectrum and simple nucleon structure observables with physical quark masses, and on the verge of producing reliable results for nucleon EDMs induced by quark-gluon operators starting from the lowest-order operators. In this talk, I will overview the current status of such calculations as well as show some recent results. [Preview Abstract] |
Wednesday, October 16, 2019 9:42AM - 10:18AM |
KA.00003: Short-lived radioactive molecules: A sensitive laboratory for the study of fundamental symmetries Invited Speaker: Ronald G. Garcia Ruiz Molecules containing heavy and deformed radioactive nuclei are predicted to provide enhanced sensitivity to explore the nuclear electroweak structure as well as to test the violation of fundamental symmetries. However, experimental measurements of such radioactive systems are scarce, and in most of the cases, quantum-chemistry calculations constitute the only source of available information. This contribution will expose recent achievements in laser spectroscopy of radioactive molecules at CRIS, ISOLDE-CERN. Laser spectroscopy measurements of short-lived radium fluoride molecules (RaF) will be presented. The impact of these results in EDM searches and symmetry-violating measurements will be discussed. [Preview Abstract] |
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