604 research outputs found
Finding the Leptonic Decay Mode of a Heavy Higgs Boson
We reanalyze the extraction of the heavy Higgs boson signal from the
Standard Model background at hadron supercolliders, taking into account revised
estimates of the top quark background. With new acceptance criteria the
detection of the signal remains viable. Requiring a forward jet-tag, a central
jet-veto, and a large relative transverse momentum of the two charged leptons
yields for one year of running at the SSC or LHC.Comment: LaTex(Revtex), 9 pages, 6 figures (available upon request),
MAD/PH/75
Residual Symmetries for Neutrino Mixing with a Large theta_13 and Nearly Maximal delta_D
The residual Z^s_2(k) and bar Z^s_2(k) symmetries induce a direct and unique
phenomenological relation with theta_x (= theta_13) expressed in terms of the
other two mixing angles, theta_s (= theta_12) and theta_a (= theta_23), and the
Dirac CP phase delta_D. Z^s_2(k) predicts a theta_x probability distribution
centered around 3^o ~ 6^o with an uncertainty of 2^o to 4^o while those from
bar Z^s_2(k) are approximately a factor of two larger. Either result fits the
T2K, MINOS and Double CHOOZ measurements. Alternately a prediction for the
Dirac CP phase delta_D results in a peak at +-74^o (+-106^o) for Z^s_2(k) or
+-123^o (+-57^o) for bar Z^s_2(k) which is consistent with the latest global
fit. We also give a distribution for the leptonic Jarslkog invariant J_v which
can provide further tests from measurements at T2K and NOvA.Comment: Accepted for publication in PR
Neutrino Mass Squared Differences in the Exact Solution of a 3-3-1 Gauge Model without Exotic Electric Charges
The mass splittings for the Majorana neutrinos in the exact solution of a
particular 3-3-1 gauge model are computed here in detail. Since both
and the mass splittings ratio
are taken into account, the analytical calculations
seem to predict an inverted mass hierarchy and a mixing matrix with a texture
based on a very close approximation to the bi-maximal mixing. The resulting
formulas for the mass squared differences can naturally accomodate the
available data if the unique free parameter () gets very small values
(). Consequently, the smallness of the parameter requires
(according to our method) a large breaking scale TeV
in the model. Hence, the results concerning the neutrino mass splittings may
lead to a more precise tuning in the exact solution of the 3-3-1 model of
interest, being able - at the same time - to recover all the Standard Model
phenomenology and predict the mass spectrum of the new gauge bosons
in accordance with the actual data. The minimal absolute mass
in the neutrino sector is also obtained - eV - in the case
of our suitable approximation for the bi-maxcimal mixing.Comment: 10 pages, no figure
Scales of Mass Generation for Quarks, Leptons and Majorana Neutrinos
We study 2 --> n inelastic fermion-(anti)fermion scattering into multiple
longitudinal weak gauge bosons and derive universal upper bounds on the scales
of fermion mass generation by imposing unitarity of the S-matrix. We place new
upper limits on the scales of fermion mass generation, independent of the
electroweak symmetry breaking scale. We find that the strongest 2 --> n limits
fall in a narrow range, 3-170 TeV (with n=2-24), depending on the observed
fermion masses.Comment: Phys. Rev. Lett.(in press), minor rewordin
Muon decay in a linearly polarized laser field
In a previous paper, we showed that the decay rate of a muon is only slightly
affected by the presence of a circularly polarized laser and we gave an
analytic expression for the correction. In this paper, we present the
analytical result for the case of a linearly polarized laser. Again the effect
of the laser is small.Comment: 6 pages, no figure
High energy photon-neutrino elastic scattering
The one-loop helicity amplitudes for the elastic scattering process
in the Standard Model are computed at high center of
mass energies. A general decomposition of the amplitudes is utilized to
investigate the validity of some of the key features of our results. In the
center of mass, where , the cross section grows roughly as
to near the threshold for -boson production, .
Although suppressed at low energies, we find that the elastic cross section
exceeds the cross section for when
GeV. We demonstrate that the scattered photons are circularly polarized and the
net value of the polarization is non-zero. Astrophysical implications of high
energy photon-neutrino scattering are discussed.Comment: 9 pages, 7 figures, RevTeX
Comment on "Damping of Tensor Modes in Cosmology"
We provide an analytic solution to the short wave length limit of the
integro-differential equation describing the damping of the tensor modes of
gravitational waves.Comment: Minor changes to abstract and reference
gamma nu -> gamma gamma nu and crossed processes at energies below m_W
The cross sections for the processes ,
and are
calculated for a range of center of mass energies from below to
considerably above , but much less than . This enables us to treat
the neutrino--electron coupling as a four--Fermi interaction and results in
amplitudes which are electron box diagrams with three real photons and one
virtual photon at their vertices. These calculations extend our previous
low--energy effective interaction results to higher energies and enable us to
determine where the effective theory is reliable.Comment: 12 pages, RevTex, 10 postscript figures include
Analyzing the nucleon spin in weak interaction processes at HERA energies
We investigate the possibility to measure the spin content carried by the
different quark flavors in a nucleon by means of polarized deep inelastic
scattering with exchange at HERA. Such measurements require a polarized
proton beam. The expected inclusive and semi inclusive asymmetries are sizable
and for realistic luminosities the expected statistical accuracies are good
enough to extract new and relevant information on the valence quark and the
strange sea distributions.Comment: 15 pages, including 4 figure
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