18,817 research outputs found
Calculation of nuclear matrix elements in neutrinoless double electron capture
We compute nuclear matrix elements for neutrinoless double electron capture
on Gd, Er and W nuclei. Recent precise mass
measurements for these nuclei have shown a large resonance enhancement factor
that makes them the most promising candidates for observing this decay mode. We
use an advanced energy density functional method which includes beyond
mean-field effects such as symmetry restoration and shape mixing. Our
calculations reproduce experimental charge radii and values predicting
a large deformation for all these nuclei. This fact reduces significantly the
values of the NMEs leading to half-lives larger than years for the
three candidates
Effective theories and constraints on new phyhsics
Anomalous moments of the top quark arises from one loop corrections to the
vertices and . We study these anomalous couplings
in different frameworks: effective theories, Standard Model and 2HDM. We use
available experimental results in order to get bounds on these anomalous
couplings.Comment: 8 pages, 2 figures, talk presented by R. Martinez at the X Mexican
School of Particles and Fields, Playa del Carmen, Mexico, 200
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