Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session 1WA: Neutrinos and Fundamental Symmetries I |
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Chair: Vincenzo Cirigliano, Los Alamos National Laboratory Room: Hilton Hotel Mesa A |
Tuesday, November 2, 2010 3:00PM - 3:30PM |
1WA.00001: Neutrinos and Fundamental Symmetries: L, CP, and CPT Invited Speaker: General classes of mechanisms for generating small neutrino masses are surveyed from a top-down perspective. In particular, string constructions have motivated various possibilities involving higher-dimensional operators, string instantons, and volume effects in large extra dimensions. These may yield small Dirac masses, Majorana masses via the Weinberg operator, or Majorana masses from a seesaw mechanism, though the latter typically differ in detail from the more conventional GUT models. Comments are made concerning leptonic CP and CPT violation. [Preview Abstract] |
Tuesday, November 2, 2010 3:30PM - 4:00PM |
1WA.00002: Accelerator Neutrino Oscillations Invited Speaker: The oscillation of atmospheric neutrinos was the first conclusive evidence of physics beyond the standard model. The K2K and MINOS long-baseline neutrino experiments have confirmed and explored atmospheric neutrino oscillations in detail. Near-term experiments are exploiting the knowledge of solar and atmospheric neutrino oscillations to search for the last unmeasured angle in the neutrino-mixing matrix. Future experiments will search for leptonic CP non-conservation and will try to determine the neutrino mass ordering. After briefly discussing the current status of accelerator long-baseline neutrino measurements, I will describe the near-term and future accelerator-based long-baseline neutrino oscillation program. [Preview Abstract] |
Tuesday, November 2, 2010 4:00PM - 4:30PM |
1WA.00003: $\theta_{13}$ Measurements Invited Speaker: The measurement of the neutrino mixing angle $\theta_{13}$ is a priority for neutrino physics, as it is necessary to know this parameter to achieve full sensitivity for resolving the neutrino mass hierarchy and for searching for CP violation in the neutrino sector. A value of $sin^{2}2\theta_{13}$ of less than 0.01 would require facilities beyond the scope of some planned new neutrino experiments. Current information on $\theta_{13}$ from reactor, atmospheric neutrinos, and accelerator experiments is reviewed, and a status report is given on new experiments under construction.\\ [Preview Abstract] |
Tuesday, November 2, 2010 4:30PM - 5:00PM |
1WA.00004: COFFEE BREAK
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Tuesday, November 2, 2010 5:00PM - 5:30PM |
1WA.00005: Double Beta Decay and the Nature of the Neutrino Invited Speaker: The observation of neutrino oscillations firmly established non- zero neutrino mass and the existence of mass mixing. Despite this success it remains unclear whether or not neutrinos are their own anti-particles. The investigation of neutrinoless double beta decay allows to explore this question. Combined with nuclear structure calculations and assumptions on the underlying particle physics, double beta decay rates further constrain the absolute neutrino mass scale. A number of new searches for the extremely rare nuclear double beta decay is in the planing or construction phase. I will give an overview of the world wide experimental effort in this area by discussing my subjective choice of the most advanced projects. [Preview Abstract] |
Tuesday, November 2, 2010 5:30PM - 6:00PM |
1WA.00006: Neutron Lifetime Invited Speaker: The recent neutron lifetime experiment [1] has provided the value 878.5 $\pm $ 0.8 s. It differs by 6.5 standard deviations from the world average value 885.7 $\pm $ 0.8 s quoted by the particle data group (PDG) in 2006 [2]. In determination of the world average value of the neutron lifetime there is rather dramatic situation. On the one hand a new value of neutron lifetime from work [1] cannot be included in the world average value because of the big difference of results. On the other hand until this major disagreement is understood the present world average value for the neutron lifetime must be suspect. So the situation on PDG page devoted to the neutron lifetime is formulated [2] in view of this controversy. The only way out of the present situation is to carry out new more precise experiments. More detailed analysis of the previous experiments and search of possible systematic error is also reasonable. In this connection the analysis and Monte Carlo simulation of experiments [3] and [4] is carried out. Systematic errors of about -6~s are found in each of the experiments. The summary table for the neutron lifetime measurements after corrections and additions is given. A new world average value for the neutron lifetime 879.9 $\pm $ 0.9~s is presented. The value $\vert $V$_{ud}\vert $ = 09743(7), calculated for the new world average value for the neutron lifetime 879.9(9)~s and g$_{A}$ = 12750(9) [5], agrees with both $\vert $V$_{ud}\vert $ = 097419(22) from the unitarity of the CKM matrix elements [2] and $\vert $V$_{ud}\vert $ = 097425(22), measured from the superallowed 0$^{+} \quad \to $ 0$^{+}$ nuclear $\beta $-decays, caused by pure Fermi transitions only [5,6]. The analysis of neutron $\beta $-decay with new world average neutron lifetime demonstrates reasonable agreement in frame of Standard Model. \\[4pt] [1] A. Serebrov et al., Phys. Lett. B 605, 72 (2005); A.P. Serebrov et al., Phys. Rev. C 78, 035505 (2008). \\[0pt] [2] C.~Amsler et al. (Particle Data Group), Phys. Lett. B 667, 1 (2008). \\[0pt] [3] S.~Arzumanov et al., Phys. Lett. B 483, 15 (2000). \\[0pt] [4] W. Mampe et al., Phys. Rev. Lett. 63, 593 (1989). \\[0pt] [5] H. Abele, Prog. Part. Nucl. Phys. 60, 1 (2008). \\[0pt] [6] J. C. Hardy, I.S. Towner, Phys. Rev. C 79, 055502 (2009). [Preview Abstract] |
Tuesday, November 2, 2010 6:00PM - 6:30PM |
1WA.00007: Neutrons and Fundamental Symmetries Invited Speaker: The scientific program of experiments employing cold neutron beams and stored ultracold neutrons for low-energy precision tests of fundamental symmetries is quite broad, spanning the fields of nuclear physics, particle physics, and cosmology. Although the experimental program is diverse, ranging from precision measurements of the lifetime and parity-violation in neutron beta-decay, to searches for time-reversal-violation in the static neutron, to searches for neutron-antineutron oscillations, the overarching goal common to all of these measurements is a high-precision test of the electroweak sector of the Standard Model. This presentation will outline the physics case for tests of fundamental symmetries with neutrons, highlight recent experimental progress in the field, and discuss the prospects for future improvements. [Preview Abstract] |
Tuesday, November 2, 2010 6:30PM - 7:00PM |
1WA.00008: Lattice QCD and fundamental symmetries Invited Speaker: Latest results for the neutron electric dipole moment and the hadronic contributions to the muon anomalous magnetic moment (g-2) computed in lattice QCD(+QED) are discussed. [Preview Abstract] |
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