328 research outputs found
Improved Fixed Center Approximation of the Faddeev equations for the system with S=0
We extend the Fixed Center Approximation (FCA) to the Faddeev Equations for
the system with S=0, including the charge exchange mechanisms in
the rescattering which have been ignored in former works within the
FCA. We obtain similar results to those found before, but the binding is
reduced by 6 MeV. At the same time we also evaluate the explicit contribution
the intermediate state in the three body system and find that it
produces and additional small decrease in the binding of about 3 MeV. The
system appears bound by about 35 MeV and the width omitting two body
absorption, is about 50 MeV.Comment: 12 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1102.285
, and molecules
We investigate theoretically baryon systems made of three hadrons which
contain one nucleon and one D meson, and in addition another meson, or . The systems are studied using the Fixed Center Approximation
to the Faddeev equations. The study is made assuming scattering of a or a
on a cluster, which is known to generate the ,
or the scattering of a nucleon on the cluster, which has been shown
to generate a hidden charm resonance named X(3700). We also investigate the
configuration of scattering of on the cluster, which is known to
generate the . In all cases we find bound states, with the
system, of exotic nature, more bound than the .Comment: 9 figure
The effect of quality properties on Tulum cheese using different package materials
This study examined the effects of starter culture, pasteurization and packaging on the chemical, textural and sensory properties of traditional Tulum cheese. Cheese samples produced from pasteurized milk were found to have higher dry matter, fat and protein contents and acidity values than cheese samples produced from raw milk. No significant difference was found in the sensory properties of cheese produced from raw and pasteurized milk. In view of these findings, the use of pasteurized milk in the production of Tulum cheese can be recommended as a suitable alternative to raw milk, and the use of cloth packaging material in place of animal skin can also be recommended.Key words: Maturation, package, Tulum cheese
A narrow quasi-bound state
The energies and widths of quasi-bound states with isospin I=1/2 are
evaluated in two methods, the fixed center approximation to the Faddeev
equation and the variational method approach to the effective one-channel
Hamiltonian. The interactions are constructed so that they dynamically
generate the (I=0, ) resonance state. We find
that the system is bound by about 250 MeV from the threshold, MeV. Its width including both the mesonic decay and the
absorption, is estimated to be about 20-40 MeV. The I=0 pair in the
system is found to form a cluster that is similar to the .Comment: 17 pages, 18 figures, 3 table
Production and mixing of scalar mesons in and decays
We briefly discuss how the chiral unitary approach in coupled channels and
symmetry can be used to describe the production of ,
and in the reaction,
recently measured by the BESIII collaboration. In this reaction a very strong
peak for the can be seen in the invariant mass, while
clear signals for the and appear in the one of
. Next, we show the predictions made with the same model for the
analogous decay , which could also be measured
experimentally. We discuss the differences of these two reactions which are
interesting to test the picture where these scalar mesons are dynamically
generated from the interaction of pairs of pseudoscalars. Furthermore, we
comment on a new recent work where the same model was used to study the
mixing in the and
reactions, showing that quantitative
agreement with the experimental measurement of this mixing, also performed by
BESIII, can be obtained, revealing interesting aspects of the dynamics of this
process and the importance of coupled channels.Comment: Talk presented at the XVII International Conference on Hadron
Spectroscopy and Structure - Hadron2017, 25-29 September, 2017, University of
Salamanca, Salamanca, Spain. arXiv admin note: substantial text overlap with
arXiv:1707.0722
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