560 research outputs found

### CPT and Lorentz Violations in Neutrino Oscillations

Tests of Lorentz invariance violation and CPT Violation in neutrino
oscillations are discussed. The sensitivity of current and future experiments
is presented.Comment: References added and typos corrected, 8 pages, 1 figure, latex209.
Presented at the Second Meeting on CPT and Lorentz Symmetry CPT'01, August
15-18, 2001, Bloomington, Indian

### CP Violation in Hyperon Decays

The theory and phenomenology of CP violation in hyperon decays is summarized.Comment: 11 pages, Latex format, 1 figure. Invited talk at the Third
International Conference on B Physics and CP Violation, National Taiwan
Univ., Taipei, Taiwan, Dec. 3-7, 1999; to be published in the Proceeding

### Flavor Mass and Mixing and S_3 Symmetry -- An S_3 Invariant Model Reasonable to All --

We assume that weak bases of flavors (u, c)_{L,R}, (d,s)_{L,R}, (e, \mu)
_{L,R}, (\nu_e, \nu_\mu)_{L,R} are the S_3 doublet and t_{L,R}, b_{L,R},
\tau_{L,R}, {\nu_\tau}_{L,R} are the S_3 singlet and further there are S_3
doublet Higgs (H_D^1, H_D^2) and S_3 singlet Higgs H_S. We suggest an S_3
invariant Yukawa interaction, in which masses caused from the interaction of
S_3 singlet flavors and Higgs is very large and masses caused from interactions
of S_3 doublet flavors and Higgs are very small, and the vacuum expectation
value _0 is rather small compared to the _0. In this model,
we can explain the quark sector mass hierarchy, flavor mixing V_{CKM} and
measure of CP violation naturally. The leptonic sector mass hierarchy and
flavor mixing described by V_{MNS} having one-maximal and one-large mixing
character can also be explained naturally with no other symmetry restriction.
In our model, an origin of Cabibbo angle is the ratio \lambda=_0
/_0 and an origin of CP violation is the phase of H_D^1.Comment: 16 page

### Exotic Higgs decays in the E6 inspired SUSY models

We study the decays of the SM-like Higgs state within the E6 inspired
supersymmetric (SUSY) models with exact custodial symmetry that forbids
tree-level flavor-changing transitions and the most dangerous baryon and lepton
number violating operators. In these models there are two states which are
absolutely stable and can contribute to the dark matter density. One of them is
the lightest SUSY particle (LSP) which is expected to be lighter than 1 eV
forming hot dark matter in the Universe. The presence of another stable neutral
state allows to account for the observed cold dark matter density. In the
considered SUSY models next-to-lightest SUSY particle (NLSP) also tend to be
light. We argue that the NLSP with GeV scale mass can result in the substantial
branching ratio of the nonstadard decays of the lightest Higgs boson.Comment: 15 pages, minor changes to the text. arXiv admin note: text overlap
with arXiv:1201.5488 by other author

### TriMinimal Parametrization of the Neutrino Mixing Matrix

Current experimental data on neutrino mixing are very well described by
TriBiMaximal mixing. Accordingly, any phenomenological parametrization of the
MNSP matrix must build upon TriBiMaximal mixing. We propose one particularly
natural parametrization, which we call "TriMinimal". The three small deviations
of the PDG angles from their TriBiMaximal values, and the PDG phase,
parametrize the TriMinimal mixing matrix. As an important example of the
utility of this new parametrization, we present the simple resulting
expressions for the flavor-mixing probabilities of atmospheric and
astrophysical neutrinos. As no foreseeable experiment will be sensitive to more
than second order in the small parameters, we expand these flavor probabilities
to second order.Comment: Typos corrected, references added, title changed; matches version
appearing in PRL 100, 111801 (2008)

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