531 research outputs found
New Physics and Neutrino Oscillation
Description of neutrino oscillation in the case of Non-Standard neutrino
Interaction (NSI) is briefly presented. The NSI causes the entanglement between
internal degrees of freedom of neutrinos (mass, spin, flavour) and other
accompanying particles in the production and detection processes. In such case
neutrinos are mostly in the mixed states. Role of the density matrix in
description of neutrino oscillation process is shortly explained.Comment: 3 pages. Talk given at NOW 2010: Neutrino Oscillation Workshop, Conca
Specchiulla (Otranto), Lecce, Italy, 4-11 Sep 201
High-energy electrons from the muon decay in orbit: radiative corrections
We determine the correction to the energy spectrum of
electrons produced in the decay of muons bound in atoms. We focus on the
high-energy end of the spectrum that constitutes a background for the
muon-electron conversion and will be precisely measured by the upcoming
experiments Mu2e and COMET. The correction suppresses the background by about
15\%.Comment: 7 pages, v2: corrected and improved versio
Algebraic Geometry Approach in Gravity Theory and New Relations between the Parameters in Type I Low-Energy String Theory Action in Theories with Extra Dimensions
On the base of the distinction between covariant and contravariant metric
tensor components, a new (multivariable) cubic algebraic equation for
reparametrization invariance of the gravitational Lagrangian has been derived
and parametrized with complicated non - elliptic functions, depending on the
(elliptic) Weierstrass function and its derivative. This is different from
standard algebraic geometry, where only two-dimensional cubic equations are
parametrized with elliptic functions and not multivariable ones.
Physical applications of the approach have been considered in reference to
theories with extra dimensions. The s.c. "length function" l(x) has been
introduced and found as a solution of quasilinear differential equations in
partial derivatives for two different cases of "compactification + rescaling"
and "rescaling + compactification". New physically important relations
(inequalities) between the parameters in the action are established, which
cannot be derived in the case of the standard gravitational theory, but
should be fulfilled also for that case.Comment: 4 pages; no figures; Talk at the Grassmannian Conference in
Fundamental Cosmology "Grasscosmofun'09" (14-19 September 2009, University of
Szczecin, Poland); prepared for the Proceedings of the Conference, which will
appear in a special issue of the journal "Annalen der Physik" (Leipzig);
"Ann.der Phys." style files use
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