3,225 research outputs found
Combined flavor symmetry violation and lepton number violation in neutrino physics
Heavy singlet neutrinos admit Majorana masses which are not possible for the
Standard Model particles. This suggest new possibilities for generating the
masses and mixing angles of light neutrinos. We present a model of neutrino
physics which combines the source of lepton number violation with the flavor
symmetry responsible for the hierarchy in the charged lepton and quark sector.
This is accomplished by giving the scalar field effecting the lepton number
violation a nonzero charge under the horizontal flavor symmetry. We find an
economical model which is consistent with the measured values of the
atmospheric and solar neutrino mass-squares and mixing angles.Comment: 6 pages, no figures (published version
Packing defects and the width of biopolymer bundles
The formation of bundles composed of actin filaments and cross-linking
proteins is an essential process in the maintenance of the cells' cytoskeleton.
It has also been recreated by in-vitro experiments, where actin networks are
routinely produced to mimic and study the cellular structures. It has long been
observed that these bundles seem to have a well defined width distribution,
which has not been adequately described theoretically. We propose here that
packing defects of the filaments, quenched and random, contribute an effective
repulsion that counters the cross-linking adhesion energy and leads to a well
defined bundle width. This is a two-dimensional strain-field version of the
classic Rayleigh instability of charged droplets
A possible supersymmetric solution to the discrepancy between B -> \phi K_S and B -> \eta' K_S CP asymmetries
We present a possible supersymmetric solution to the discrepancy between the
observed mixing CP asymmetries in B -> \phi K_S and B -> \eta' K_S. We show
that due to the different parity in the final states of these processes, their
supersymmetric contributions from the R-sector have an opposite sign, which
naturally explain the large deviation between S_{\phi K_S} and S_{\eta' K_S}.
We also consider the proposed mechanisms to solve the puzzle of the observed
large branching ratio of B -> \eta' K and study their impact on S_{eta' K_S}.Comment: 4 pages, 2 figure
- …