Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session T4: Neutrinos III |
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Sponsoring Units: DPF DNP Chair: Robert McKeown, California Institute of Technology Room: Hyatt Regency Jacksonville Riverfront Grand 3 |
Monday, April 16, 2007 1:30PM - 2:06PM |
T4.00001: Neutrino Theory Invited Speaker: |
Monday, April 16, 2007 2:06PM - 2:42PM |
T4.00002: Search for the Neutrino Mixing Angle $\theta_{13}$ Invited Speaker: The discovery of neutrino flavor change and mixing in atmospheric, solar, and reactor experiments has provided compelling evidence for neutrino mass and oscillation. Two of the three neutrino mixing angles have been measured but the coupling of the electron neutrino flavor to the third mass eigenstate is yet unknown. Its corresponding mixing angle $\theta_{13}$ is a fundamental parameter of the new Standard Model and critical for future CP violation searches in the lepton sector. A non-zero $\theta_{13}$ is necessary for observing leptonic CP violation which plays an important role in leptogenesis. Past experiments provide limits on $\theta_{13}$ and have shown that it is much smaller than the other neutrino mixing angles. This talk will review our current knowledge of neutrino mixing from non-accelerator experiments and describe the prospects for future precision measurements of $\theta_{13}$. Several next-generation oscillation experiments using reactor antineutrinos have been proposed and aim to reach a sensitivity of sin$^2\theta_{13} < 0.01$ in the measurement of $\overline{\nu}_{e}$ disappearance. The search for $\theta_{13}$ with reactor antineutrinos will be complementary to the measurements with upcoming accelerator experiments and an important element in the program to understand the neutrino mixing matrix. The implications of an observation of non-zero $\theta_{13}$ will be discussed. [Preview Abstract] |
Monday, April 16, 2007 2:42PM - 3:18PM |
T4.00003: Henry Primakoff Lecture: Neutrinoless Double-Beta Decay Invited Speaker: With the realization that neutrinos are massive, there are intriguing questions about their very nature. Might neutrinos and antineutrinos be actually the same particles, so called Majorana particles? Many theoretical models favor the existence of Majorana neutrinos, which would break one of nature's most fundamental symmetries -- lepton number conservation. Neutrinoless double-beta decay provides the only practical experimental technique to probe the Majorana nature of neutrinos. Observation of this decay mode would not only demonstrate that neutrinos are Majorana particles and violate lepton number, but would determine the absolute mass of neutrinos as well, since the rate of the observed decay is directly proportional to the square of the effective Majorana neutrino mass. A number of next-generation experiments are currently being constructed or developed that initially aim to achieve sensitivities to the neutrino mass in the ``quasi-degenerate'' region ($>$ 100 meV). This talk will review the physics of neutrinoless double-beta decay, explain the need to study neutrinoless double-beta decay in different isotopes using diverse experimental techniques, and discuss the status of current experimental efforts. [Preview Abstract] |
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