2,033 research outputs found
Combined analysis of the decays and
In a combined study of the decay spectra of and
decays within a dispersive representation of the
required form factors, we illustrate how the resonance parameters,
defined through the pole position in the complex plane, can be extracted with
improved precision as compared to previous studies. While we obtain a
substantial improvement in the mass, the uncertainty in the width is only
slightly reduced, with the findings MeV and
MeV. Further constraints on the width
could result from updated analyses of the and/or spectra using
the full Belle-I data sample. Prospects for Belle-II are also discussed. As the
vector form factor enters the description of the decay , we are in a position to investigate isospin violations in its
parameters like the form factor slopes. In this respect also making available
the spectrum of the transition would be extremely
useful, as it would allow to study those isospin violations with much higher
precision.Comment: 20 pages, 1figur
Dynamical analysis on cosmology
We use a dynamical system approach to study the cosmological viability of
gravity theories. The method consists of formulating the
evolution equations as an autonomous system of ODEs, using suitable variables.
The formalism is applied to a class of models in which and its solutions and corresponding stability are
analysed in detail. New accelerating solutions that can be attractors in the
phase space are found. We also find that this class of models does not exhibit
a matter-dominated epoch, a solution which is inconsistent with current
cosmological observations.Comment: 12 pages, 4 figures. Accepted for publication in Classical and
Quantum Gravit
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