1,325 research outputs found
Exotic Fermions and Bosons in the Quartification Model
Exotic fermions of half-integral charges at the TeV energy scale are
predicted by the quartification model of Babu, Ma, and Willenbrock. We add to
these one copy of their scalar analogs and discuss the ensuing phenomenological
implications, i.e. radiative contributions to lepton masses and flavor-changing
leptonic decays.Comment: 7 pages, including 3 figure
Tripartite Neutrino Mass Matrix
The 3 X 3 Majorana neutrino mass matrix is written as a sum of 3 terms, i.e.
M_nu = M_A + M_B + M_C, where M_A is proportional to the identity matrix and
M_B and M_C are invariant under different Z_3 transformations. This M_nu is
very suitable for understanding atmospheric and solar neutrino oscillations,
with sin^2 (2 theta_atm) and tan^2 (theta_sol) fixed at 1 and 0.5 respectively,
in excellent agreement with present data. It has in fact been proposed before,
but only as an ansatz. This paper uncovers its underlying symmetry, thus
allowing a complete theory of leptons and quarks to be constructed.Comment: 9 pages, no figur
Quarks and Leptons in a Hexagonal Chain
The seemingly disparate notions of chiral color and quark-lepton
nonuniversality are combined, and shown to be essential to each other as part
of an underlying (and unifying) larger symmetry, i.e. supersymmetric SU(3)^6.
Both phenomena are accessible experimentally at the TeV energy scale.Comment: 10 pages, including 1 figur
Study of Single W production in e-gamma collisions through the decay lepton spectrum to probe gamma-WW couplings
We investigate the effect of anomalous gamma-W-W couplings in e-gamma --> nu
W through the angular and energy spectrum of the secondary leptons. Within the
narrow-width approximation, a semi-analytical study of the secondary lepton
energy-angle double distribution is considered. Utility of observables derived
from this is demonstrated by considering the anomalous coupling,
delta-kappa-gamma. Results of our investigation for typical ILC machine
considered at Ecm = 300-1000 GeV re-affirms potential of this collider as a
precision machine.Comment: Typos corrected, discussion added in section 2 for clarity, error in
fig.2 corrected, figures 7 and 8 replaced with better resolutio
New "Square Root" Model of Lepton Family Cyclic Symmetry
Following the newly formulated notion of form invariance of the neutrino mass
matrix, a complete model of leptons is constructed. It is based on a specific
unitary 3 X 3 matrix U in family space, such that U^2 is the simple discrete
symmetry nu_e to -nu_e, nu_mu to nu_tau. Thus U also generates the cyclic group
Z_4. The charged-lepton mass matrix is nearly diagonal while the neutrino mass
matrix is of the form suitable for explaining maximal (large) mixing in
atmospheric (solar) neutrino oscillations in the context of three nearly
degenerate neutrino masses. Observable lepton flavor violation is predicted.
Quarks may be treated in the same way as the charged leptons.Comment: 10 pages, no figur
CP Violating Form Factors for Three Gauge Boson Vertex in the Two Higgs Doublet and Left-Right symmetric Models
In this paper we calculate the one loop contributions to the CP violating
three gauge boson couplings in two-Higgs doublet and Left--Right symmetric
models. In the two-Higgs doublet model only a P conserving and CP violating
coupling is generated, and it can be large as . In the Left--Right
symmetric model both P conserving and violating couplings are generated. Due to
constraints on the -- mixing, these couplings are small.Comment: 9 pages, Tex, UM-P-92/75, OZ-92/2
A Renormalization Group Analysis of the Higgs Boson with Heavy Fermions and Compositeness
We study the properties of heavy fermions in the vector-like representation
of the electro-weak gauge group with Yukawa couplings to
the standard model (SM) Higgs boson. Using the renormalization group analysis,
we discuss their effects on the vacuum stability and the triviality bound on
the Higgs self-coupling, within the context of the standard model (i.e., the
Higgs particle is elementary). Contrary to the low energy case where the
decoupling theorem dictates their behavior, the inclusion of heavy fermions
drastically change the SM structure at high scale. We also discuss the
interesting possibility of compositeness, i.e., the Higgs particle is composed
of the heavy fermions using the method of Bardeen, Hill and
Lindner~\cite{BHL91}. Finally we briefly comment on their possible role in
explaining and .Comment: Some typographic errors are corrected and title is changed. Version
to appear in Physics Letter B. 9 pages 6 Postscript figures, use epsf.st
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