3,139 research outputs found
How to understand the underlying structures of , , and
We investigate the possible rescattering effects which may contribute to the
process . It is shown that the
rescattering via the open-charmed meson loops, and
rescattering via the loops may simulate the structures of
and , respectively. However, if the quantum numbers of
() are (), it is hard to to ascribe the
observation of and to the -wave threshold rescattering
effects, which implies that and could be genuine
resonances. We also suggest that may be the conventional orbitally
excited state .Comment: 14 pages, 5 figures, 1 tabl
Searching for observable effects induced by anomalous triangle singularities
We investigate the anomalous triangle singularity (ATS) and its possible
manifestations in various processes. We show that the ATS should have important
impact on our understanding of the nature of some newly observed threshold
states. Discussions on how to distinguish the ATS phenomena from genuine
dynamic pole structures are presented.Comment: 13 pages, 5 figures, 1 table, version to appear in Phys. Lett.
More hidden heavy quarkonium molecules and their discovery decay modes
To validate the molecular description of the observed
and , it is valuable to investigate their counterparts,
denoted as in this work, and the corresponding decay modes.
In this work, we present an analysis of the using flavor
symmetry. We also use the effective Lagrangian based on the heavy quark
symmetry to explore the rescattering mechanism and calculate the partial widths
for the isospin conserved channels . The
predicted partial widths are of an order of MeV for ,
which correspond to branching ratios of the order of . For
, the partial widths are a few hundreds of keV and
the branching ratios are about . Future experimental measurements can
test our predictions on the partial widths and thus examine the molecule
description of heavy quarkoniumlike exotic states.Comment: 11 pages, 2 figures; accepted by Phys. Rev.
Photoproduction of hidden charm pentaquark states and
We propose to study the pentaquark candidates of and
in photoproduction and look for further experimental
evidence for their nature. Since the photoproduction process does not satisfy
the so-called "anomalous triangle singularity" condition their presence in
photoproduction would conclude that they should be genuine states and
provide further evidence for their existence.Comment: Accepted by Phys.Rev.
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