Bulletin of the American Physical Society
81st Annual Meeting of the APS Southeastern Section
Volume 59, Number 18
Wednesday–Saturday, November 12–15, 2014; Columbia, South Carolina
Session HB: Lattice QCD and EFT |
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Chair: Dean Lee, North Carolna State University Room: Richland I |
Friday, November 14, 2014 11:00AM - 11:36AM |
HB.00001: The exotic frontiers of lattice QCD Invited Speaker: Raul Briceno Lattice QCD has proven to be a remarkably powerful tool for studying masses and electroweak properties of low-lying hadronic states. Extending the power of this tool to study few-body hadronic observables would impact our understanding of phenomena ranging from the inner structure of exotic mesons to the rare processes seen in particle accelerators that might shed light on possible extensions to the present paradigm of nuclear/particle physics. In this talk, I will first review the challenges associated with the studies of such systems via Lattice QCD. I will discuss recent progress towards being able to study elastic/inelastic scattering cross sections as well elastic/transition form factors for few-body systems. Finally, I will outline outstanding problems and discuss the future of the field. [Preview Abstract] |
Friday, November 14, 2014 11:36AM - 12:12PM |
HB.00002: Electromagnetic structure of light nuclei from Chiral Effective Field Theory Invited Speaker: Saori Pastore In this talk, I present a number of calculations of electromagnetic observables for $A\le 9$ nuclei, which account for two-body effects due to the coupling of external photons with pairs of interacting nucleons. Two-body electromagnetic currents have been recently derived from a chiral effective field theory that uses pions and nucleons as degrees of freedom. They include up to N3LO terms in the chiral expansion and consist of contact-like as well as one- and two-pion exchange operators. When used in combination with nuclear Hamiltonians that include two- and three-nucleon realistic potentials, two-body electromagnetic current operators are found to provide sizable contributions. These calculations reveal a rich nuclear electromagnetic structure where many-body effects are found to be important and not negligible in a careful interpretation of experimental data. [Preview Abstract] |
Friday, November 14, 2014 12:12PM - 12:48PM |
HB.00003: Electroweak processes and the three-nucleon potential Invited Speaker: Fred Myhrer Chiral perturbation theory, an effective low-energy field theory, will be presented. This theory connects two-nucleon weak processes such as the primary solar burning process, $pp\to D e^+\nu_e$, the $\mu D$ capture reaction and the $\nu D$ breakup reactions, which were used to determine the solar neutrino flux at SNO. The one unknown low-energy-constant (LEC) in these reactions, the two-nucleon axial coupling constant $d^R$, can be determined by $\mu D$ capture rate, which presently is being measured to an anticipated 1.5\% precision by the MuSun collaboration at PSI. Once $d^R$ is determined, the theory predicts that the other two-nucleon reaction rates will have the same accuracy. We will present how this two-nucleon LEC enters in the $pp \to NN\pi$ reaction and show its link to one of the two LECs in modern three-nucleon potentials. Finally, I will present how the theory allows the evaluation of the radiative corrections to these observables in a natural way. [Preview Abstract] |
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