870 research outputs found
Constraints from Neutrinoless Double Beta Decay
We examine the constraints from the recent HEIDELBERG-MOSCOW double beta
decay experiment. It leads us to the almost degenerate or inverse hierarchy
neutrino mass scenario. In this scenario, we obtain possible upper bounds for
the Majorana CP violating phase in the lepton sector by incorporating the data
from the neutrino oscillation, the single beta decay experiments, and from the
astrophysical observation. We also predict the neutrino mass that may be
measurable in the future beta decay experiments.Comment: 10 pages, 3 figure
Universal Texture of Quark and Lepton Mass Matrices
Against the conventional picture that the mass matrix forms in the quark
sectors will take somewhat different structures from those in the lepton
sectors, a possibility that all the mass matrices of quarks and leptons have
the same form as in the neutrinos is investigated. For the lepton sectors, the
model leads to a nearly bimaximal mixing with the prediction
|U_{e3}|^2=m_e/2m_\mu=0.0024 and \tan^2\theta_{sol} \simeq m_{\nu 1}/m_{\nu 2},
and so on. For the quark sectors, it can lead to reasonable values of the CKM
mixing matrix and masses: |V_{us}|\simeq \sqrt{m_d/m_s}, |V_{ub}| \simeq
|V_{cb}|\sqrt{m_u/m_c}, |V_{td}| \simeq |V_{cb}|\cdot |V_{us}|, and so on.Comment: 9 pages, Latex, talk given at The 4th workshop on "Neutrino
Oscillations and their Origin" (NOON2003) (Kanazawa, Japan, 10--14 Feb.
2002). To appear in the Proceeding
<CLINICAL>Clinical results of vital tooth bleaching : 1. In-office bleaching
In recent years, demand for esthetic dentistry has grown, particularly with respect to treatment of discolored anterior teeth. Tooth discoloration and pigmentation can be treated by polishing or bleaching the tooth, or by laminate veneering. Bleaching is widely used, since it allows esthetic restoration without removal of the tooth surface. However, its tooth-bleaching efficacy is often assessed in a subjective manner. This report describes the use of in-office bleaching of tetracycline-induced tooth discoloration and yellowed teeth using Hi-Lite^ and Power Gel^, respectively, and objective assessment of efficacy. In both cases, excellent improvement in tooth color was noted, with a color difference (AE) from baseline of 5.8-6.5. These results support that in-office bleaching using Hi-Lite^ or Power Gel^ is a safe and efficacious method for the treatment of tooth discoloration
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