309 research outputs found
The strong and vertices
We investigate the strong vertices among , nucleon and meson
as well as , nucleon and meson in QCD. In particular, we
calculate the strong coupling constants and
for different Dirac structures entered the calculations. In the case of
vertex, the result is compared with the only existing prediction
obtained at .Comment: 12 Pages, 3 Figures and 4 Table
On the strong coupling
We study the strong vertices , and in QCD, where
denotes the negative parity state. We use the most general
form of the interpolating currents to calculate the corresponding strong
coupling constants. It is obtained that the coupling associated to
vertex is strongly suppressed compared to those related to two other vertices.
The strong coupling corresponding to is obtained to be roughly half
of that of vertex. We compare the obtained results on and
vertices with the existing predictions of other theoretical studies as
well as those extracted from the experimental data.Comment: 15 Pages, 4 Figures and 3 Table
Strong couplings of negative and positive parity nucleons to the heavy baryons and mesons
The strong coupling form factors related to the strong vertices of the
positive and negative parity nucleons with the heavy
baryons and heavy vector mesons are
calculated using a three-point correlation function. Using the values of the
form factors at we compute the strong coupling constants
among the participating particles.Comment: 12 Pages and 7 Table
Investigation of a candidate spin- hidden-charm triple strange pentaquark state
A candidate triple strange pentaquark state, , is investigated
through its strong decay channel . To
calculate the relevant strong coupling constants, two possible interpolating
currents with spin-parity are used. Though the chosen
currents for the state under consideration have spin-parity quantum numbers
, they couple to both the positive and negative parity
states simultaneously and the corresponding decay widths are obtained for both
parities. These widths are obtained as follows: for the negative and
for the positive parity state when the first current is
used. For the second current, we obtain for the negative and
for the positive parity state. These results may provide
insights into future experimental observations of such candidate states and
help to distinguish and fix their properties.Comment: 13 Pages and 3 Table
Investigation of the strange pentaquark candidate recently observed by LHCb
The recently observed strange pentaquark candidate, , is investigated to provide information about its
nature and substructure. To this end, its mass and width through the decay
channels and
are calculated by
applying two- and three-point QCD sum rules, respectively. The state is
considered as a meson-baryon molecular structure with
spin-parity quantum numbers . The obtained mass, , and width, , are consistent with the
experimental data within the presented uncertainties. This allows us to assign
a molecular structure of for the state.Comment: 14 Pages, 2 Figures and 2 Table
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