22 research outputs found
Probing Radiative Solar Neutrinos Decays
Motivated by a pilot experiment conducted by F.Vannucci et al. during a solar
eclipse, we work out the geometry governing the radiative decays of solar
neutrinos. Surprisingly, although a smaller proportion of the photons can be
detected, the case of strongly non-degenerate neutrinos brings better limits in
terms of the fundamental couplings. We advocate satellite-based experiments to
improve the sensitivity.Comment: 11 pages, 2 Postscript figure
Decoupling of Massive Right-handed Neutrinos
We investigate the effect of B+L - violating anomalous generation of massive
right-handed neutrinos on their decoupling, when the right-handed neutrino mass
is considerably greater than the right-handed gauge boson masses. Considering
normal annihilation channels, the Lee-Weinberg type of calculation, in this
case, gives an upper bound of about 700 Gev, which casts doubt on the existence
of such a right-handed neutrino mass greater than right-handed gauge boson
masses. We examine the possibility that a consideration of anomalous effects
related to the SU(2)_R gauge group may turn this into a lower bound of the
order of 100 Tev.Comment: 28 Pages, Latex, 2 figure
Role of beam polarization in the determination of and couplings from
We evaluate the constraints on anomalous trilinear gauge-boson couplings that
can be obtained from the study of electron-positron annihilation into pairs
at a facility with either the electron beam longitudinally polarized or both
electron and positron beams transversely polarized. The energy ranges
considered in the analysis are the ones relevant to the next-linear collider
and to LEP~200. We discuss the possibilities of a model independent analysis of
the general conserving anomalous effective Lagrangian, as well as its
restriction to some specific models with reduced number of independent
couplings. The combination of observables with initial and final state
polarizations allows to separately constrain the different couplings and to
improve the corresponding numerical bounds.Comment: 24 pages, LaTeX, 9 figures (available on request from the authors
A Supersymmetric Theory of Flavor with Radiative Fermion Masses
Supersymmetric theories involving a spontaneously broken flavor symmetry can
lead to fermion masses which vanish at tree level but are generated by
radiative corrections. In the context of supersymmetric theories with minimal
low energy field content we discuss which fermion masses and mixings may be
obtained radiatively, and find that constraints from flavor changing
phenomenology imply that only the first generation fermion masses and some (but
not all) CKM mixings can naturally come from radiative corrections. We also
consider general conditions on theories of flavor which guarantee the existence
of tree level massless fermions while having non-trivial CKM matrix elements at
tree level. Two complete models of flavor are presented. In the first model,
all first generation fermion masses are radiatively generated. In the second
model, the electron and up quark mass are due to radiative corrections whereas
the down mass appears at tree level, as does a successful prediction for the
Cabibbo angle .Comment: 45 pages, LaTeX, 6 figure
A dramatic change in the rate-limiting step of β-lactam hydrolysis results from the substitution of the active-site serine residue by a cysteine in the class-C β-lactamase of Enterobacter cloacae 908R
Mass and decays of Brout-Englert-Higgs scalar with extra generations
The higher bound on the mass of the Brout-Englert-Higgs scalar boson arising from radiative corrections is not stable when the Standard Model is extended to include nondecoupling particles. In particular, additional generations of fermions allow for a heavier scalar. We investigate how the decay branchings of the scalar boson are affected by the opening of new channels.info:eu-repo/semantics/publishe
The sociology of Max Scheler : a phenomenological contribution for a philia regime of action within social entrepreneurship
The present paper has a double goal. Firstly, it tries to rediscover a little used sociological system (Max Scheler’s). Secondly, it tries to propose a thematic analysis of the third sector actors’ justifications with a specific action regime (also not much discussed). These attempts merge very fast because this retrospective becomes the limits of this very (particular?) regime. It formalizes the search for social bonds in the third sector engagement. The latter could be understood as a search for philia – in the vocabulary of the regimes of action sociology – or a sympathy search – in the vocabulary of Max Scheler’s. This search for social bonds appears as a strong opposition to “capitalist mind set (Capitalistich Geist)”