11 research outputs found
Left-Right Symmetry Breaking in NJL Approach
We study left-right symmetric models which contain only fermion and gauge
boson fields and no elementary scalars. The Higgs bosons are generated
dynamically through a set of gauge- and parity-invariant 4-fermion operators.
It is shown that in a model with a composite bi-doublet and two triplet scalars
there is no parity breaking at low energies, whereas in the model with two
doublets instead of two triplets parity is broken automatically regardless of
the choice of the parameters of the model. For phenomenologically allowed
values of the right-handed scale a tumbling symmetry breaking mechanism is
realized in which parity breaking at a high scale propagates down and
eventually causes the \EW symmetry breaking at the scale . The model exhibits a number of low and intermediate mass Higgs bosons
with certain relations between their masses. In particular, the components of
the Higgs doublet are pseudo--\GBs of an accidental
(approximate) symmetry of the Higgs potential and therefore are
expected to be relatively light.Comment: 16 pages, latex and uuencoded, packed Postscript figures. The
complete paper, including figures, is also available via WWW at
http://www.cip.physik.tu-muenchen.de/tumphy/d/T30d/PAPERS/TUM-HEP-221-95.p
Planck-Scale Physics and Neutrino Masses
We discuss gravitationally induced masses and mass splittings of Majorana,
Zeldovich-Konopinski-Mahmoud and Dirac neutrinos. Among other implications,
these effects can provide a solution of the solar neutrino puzzle. In
particular, we show how this may work in the 17 keV neutrino picture.Comment: 10 pages, IC/92/79, SISSA-83/92/EP, LMU-04/92 (the preprint number
has been corrected; no other changes
Planck scale effects in neutrino physics
We study the phenomenology and cosmology of the Majoron (flavon) models of
three active and one inert neutrino paying special attention to the possible
(almost) conserved generalization of the Zeldovich-Konopinski-Mahmoud lepton
charge. Using Planck scale physics effects which provide the breaking of the
lepton charge, we show how in this picture one can incorporate the solutions to
some of the central issues in neutrino physics such as the solar and
atmospheric neutrino puzzles, dark matter and a 17 keV neutrino. These
gravitational effects induce tiny Majorana mass terms for neutrinos and
considerable masses for flavons. The cosmological demand for the sufficiently
fast decay of flavons implies a lower limit on the electron neutrino mass in
the range of 0.1-1 eV.Comment: 24 pages, 1 figure (not included but available upon request), LaTex,
IC/92/196, SISSA-140/92/EP, LMU-09/9
Dynamical Left-Right Symmetry Breaking
We study a left--right symmetric model which contains only elementary gauge
boson and fermion fields and no scalars. The phenomenologically required
symmetry breaking emerges dynamically leading to a composite Higgs sector with
a renormalizable effective Lagrangian. We discuss the pattern of symmetry
breaking and phenomenological consequences of this scenario. It is shown that a
viable top quark mass can be achieved for the ratio of the VEVs of the
bi--doublet =~ 1.3--4. For a theoretically
plausible choice of the parameters the right--handed scale can be as low as
; in this case one expects several intermediate and low--scale
scalars in addition to the \SM Higgs boson. These may lead to observable lepton
flavour violation effects including decay with the rate close
to its present experimental upper bound.Comment: 51 pages, LaTeX and uuencoded, packed Postscript figures. The
complete paper, including figures, is also available via WWW at
http://www.cip.physik.tu-muenchen.de/tumphy/d/T30d/PAPERS/
TUM-HEP-222-95.ps.g
Left-right symmetry breaking in NJL approach
MPI-PhT--95-35; FTUV--95-34; IFIC--95-36Consiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Dynamical left-right symmetry breaking
MPI-PHT--95-70; FTUV--95-36; IFIC--95-38Consiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal