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Axino-Neutrino Mixing in Gauge-Mediated Supersymmetry Breaking Models
When the strong CP problem is solved by spontaneous breaking of an anomalous
global symmetry in theories with gauge-mediated supersymmetry breaking, the
pseudo Goldstone fermion (the axino) is a good candidate of a light sterile
neutrino. Its mixing with neutrinos relevant for current neutrino experiments
can arise in the presence of R-parity violation. The realistic four neutrino
mass matrix is obtained when the see-saw mechanism is brought in, and an ansatz
for the right-handed neutrino mass is constructed.Comment: Revtex, 7 pp. Version to appear in Phys. Lett.
Electroweak Symmetry Breaking due to Confinement
Within the framework of gauge mediated supersymmetry breaking, we consider an
electroweak symmetry breaking pattern in which there is no conventional
term. The pattern is made appealing through realizing it as low energy
effective description of a supersymmetric Yang-Mills theory which is of
confinement. Phenomenological implications are discussed.Comment: 8 pages, revtex, no figure, the discussion on effective
superpotential refine
Fan-extensions in fragile matroids
If S is a set of matroids, then the matroid M is S-fragile if, for every
element e in E(M), either M\e or M/e has no minor isomorphic to a member of S.
Excluded-minor characterizations often depend, implicitly or explicitly, on
understanding classes of fragile matroids. In certain cases, when F is a
minor-closed class of S-fragile matroids, and N is in F, the only members of F
that contain N as a minor are obtained from N by increasing the length of fans.
We prove that if this is the case, then we can certify it with a finite
case-analysis. The analysis involves examining matroids that are at most two
elements larger than N.Comment: Small revisions and correction
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