4,112 research outputs found
Hidden-bottom molecular states from interaction
In this work, we study possible hidden-bottom molecular pentaquarks
from coupled-channel interaction in
the quasipotential Bethe-Salpeter equation approach. In isodoublet sector with
, with the same reasonable parameters the interaction produces seven
molecular states, a state near threshold with spin parity
, a state near threshold with , two states near
threshold with and , and three states near
threshold with , , and . The results
suggest that three states near threshold and two states near
threshold are very close, respectively, which may be difficult
to distinguish in experiment without partial wave analysis. Compared with the
hidden-charm pentaquark, the states are relatively narrow with widths at
an order of magnitude of 1 MeV or smaller. The importance of each channel
considered is also discussed, and it is found that the channel
provides important contribution for the widths of those states. In isoquartet
sector with , cutoff should be considerably enlarged to achieve bound
states from the interaction, which makes the existence of such states
unreliable. The results in the current work are helpful for searching for
hidden-bottom molecular pentaquarks in future experiments, such as the COMPASS,
J-PARC, and the Electron Ion Collider in China (EicC).Comment: 8 pages, 3 figure
Possible molecular dibaryons with quarks and their baryon-antibaryon partners
In this work, we systematically investigate the charmed-strange dibaryon
systems with quarks and their baryon-antibaryon partners from the
interactions , ,
, and and
their baryon-antibaryon partners from interactions
, ,
, and
. The potential kernels are constructed with the
help of effective Lagrangians under SU(3), heavy quark, and chiral symmetries
to describe these interactions. To search for possible molecular states, the
kernels are inserted into the quasipotential Bethe-Salpeter equation, which is
solved to find poles from scattering amplitude. The results suggest that 36 and
24 bound states can be found in the baryon-baryon and baryon-antibaryon
interactions, respectively. However, much large values of parameter
are required to produce the bound states from the baryon-antibaryon
interactions, which questions the existence of these bound states. Possible
coupled-channel effect are considered in the current work to estimate the
couplings of the molecular states to the channels considered.Comment: 13 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2208.1196
Y(4626) as a molecular state from interaction
Recently, a new structure was reported by the Belle Colloboration
in the process . In this work, we propose an
assignment of the as a molecular state,
which decays into the channel through a coupling between
and channels. With the
help of the heavy quark symmetry, the potential of the interaction
is constructed within the
one-boson-exchange model, and inserted into the quasipotential Bethe-Salpeter
equation. The pole of obtained scattering amplitude is searched for in the
complex plane, which corresponds to a molecular state from the interaction
. The results suggest that a
pole is produced near the threshold, which exhibits
as a peak in the invariant mass spectrum of the
channel at about 4626 MeV. It obviously favors the as a
molecular state. In the same model, other molecular
states from the interaction
are also predicted, which can be checked in future experiments.Comment: 7 pages, 2 figure
Variational Monte Carlo study of chiral spin liquid in the extended Heisenberg model on the Kagome lattice
We investigate the extended Heisenberg model on the Kagome lattice by using
Gutzwiller projected fermionic states and the variational Monte Carlo
technique. In particular, when both second- and third-neighbor super-exchanges
are considered, we find that a gapped spin liquid described by non-trivial
magnetic fluxes and long-range chiral-chiral correlations is energetically
favored compared to the gapless U(1) Dirac state. Furthermore, the topological
Chern number, obtained by integrating the Berry curvature, and the degeneracy
of the ground state, by constructing linearly independent states, lead us to
identify this flux state as the chiral spin liquid with fractionalized
Chern number.Comment: 9 pages, 7 figure
- β¦