1,211 research outputs found
Production of doubly charged vector bilepton pairs at colliders
The production of pairs of doubly charged vector bileptons is studied at
future colliders. The unpolarized cross--section for the
subprocess is analytically calculated and
convoluted to predict the number of events in the complete process. The gauge or non--gauge character of the
vector bilepton is discussed. It is found that as a consequence
of its spectacular signature, as it decays dominantly into two identical
charged leptons, and also due to its charge contents, which significantly
enhance the cross--section, the detection of this class of particles with mass
in the sub--TeV region can be at the reach of these colliders. The
model--independent nature of our results is stressed.Comment: 9 pages, 7 figures, submitted to physical review
Outcome from Spontaneous CP Violation for B Decays
In the aspon model solution of the strong problem, there is a gauged
symmetry, spontaneously broken by the same vacuum expectation value
which breaks , whose massive gauge boson provides an additional mechanism
of weak violation. We calculate the asymmetries in decays for the
aspon model and show that they are typically smaller than those predicted from
the standard model. A linear relation between the asymmetries of different
decay processes is obtained.Comment: REVTEX, 9 pages, IFP-486-UNC, NSF-PT-94-1, and UDHEP-01-9
Classification of SUSY and non-SUSY Chiral Models from Abelian Orbifolds AdS/CFT
We classify compactifications of the type IIB superstring on AdS_{5} x
S^{5}/\Gamma, where \Gamma is an abelian group of order n<= 12. Appropriate
embedding of \Gamma in the isometry of S^5 yields both SUSY and non-SUSY chiral
models that can contain the minimal SUSY standard model or the standard model.
New non-SUSY three family models with \Gamma=Z_8 are introduced, which lead to
the right Weinberg angle for TeV trinification.Comment: 12 pages, no figur
Mersenne Primes, Polygonal Anomalies and String Theory Classification
It is pointed out that the Mersenne primes and associated
perfect numbers play a significant role in string
theory; this observation may suggest a classification of consistent string
theories.Comment: 10 pages LaTe
3-3-1 exotic quark search at CERN LEPII-LHC
The 3-3-1 electroweak model is the simplest chiral extension of the standard
model which predicts single and double charged bileptons and exotic quarks
carrying -4/3 and 5/3 units of the positron charge. In this paper we study the
possibilities of the production and decay of one of these exotic quarks at CERN
LEPII-LHC collider. For typical vector bilepton, exotic quark masses and mixing
angles we obtained between 20 and 750 events per year. Angular distributions
are also presented.Comment: 5 pages, RevTex 3.1, 9 eps figures, to appear in Phys. Rev.
Partial Derivation of Transformation Properties of Quarks and Leptons
Under the assumptions that with
simple is a local symmetry group at high energies, that color is
parity-conserving, and the Y-charges are irreducible, we show that anomaly
constraints imply the minimal set of fermions is fifteen in number. Given this
minimal set, we further show that must be and the unbroken
gauge symmetry is {\it either} color {\it or} the product of color with
electric charge.Comment: 9 pages, UMDHEP 94-72 and IFP-487-UN
Muon anomalous magnetic moment in string inspired extended family models
We propose a standard model minimal extension with two lepton weak SU(2)
doublets and a scalar singlet to explain the deviation of the measured
anomalous magnetic moment of the muon from the standard model expectation. This
scheme can be naturally motivated in string inspired models such as E_6 and
AdS/CFT.Comment: 9 pages, RevTeX, 2 figures, version to be published in Phys. Rev.
Horizontal Symmetry for Quark and Squark Masses in Supersymmetric SU(5)
Recent interest in horizontal symmetry model building has been driven mainly
by the large top mass and hence strong hierarchy in quark masses, and the
possibility of appropriately constrained soft squark mass matrices, in place of
an assumed universality condition, for satisfying the relevant FCNC
constraints. Here we present the first successful SUSY- model that has
such a feature. The horizontal symmetry is a gauged
(). All nonrenormalizable terms compatible with
the symmetry are allowed in the mass matrix constructions. Charged lepton
masses can also be accommodated.Comment: 15 pages, latex, 1 latex figure included version to be published in
Phys. Rev. Lett. ; some small changes in notations and presentation, a small
paragragh and 3 references adde
Correlations of the elements of the neutrino mass matrix
Assuming Majorana nature of neutrinos, we re-investigate, in the light of the
recent measurement of the reactor mixing angle, the allowed ranges for the
absolute values of the elements of the neutrino mass matrix in the basis where
the charged-lepton mass matrix is diagonal. Apart from the derivation of upper
and lower bounds on the values of the matrix elements, we also study their
correlations. Moreover, we analyse the sensitivity of bounds and correlations
to the global fit results of the neutrino oscillation parameters which are
available in the literature.Comment: 37 pages, 146 figures, minor corrections, 17 additional figures,
version for publication in JHE
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