1,191 research outputs found
Canonical interpretation of and in the family
Inspired by the new resonance , we calculate the masses and
two-body OZI-allowed strong decays of the higher vector bottomonium sates
within both screened and linear potential models. We discuss the possibilities
of and as mixed states via the mixing. Our
results suggest that and might be explained as
mixed states between - and -wave vector states. The
and resonances may correspond to the mixed states
dominated by the - and -wave components, respectively. The mass and the
strong decay behaviors of the resonance are consistent with
the assignment of the state in the potential models.Comment: 9 pages, 4 figures. More discussions are adde
Full-heavy tetraquark states and their evidences in the LHCb di- spectrum
In the framework of a nonrelativistic potential quark model (NRPQM) for heavy
quark system, we investigate the mass spectrum of the -wave tetraquark
states of and . The Hamiltonian contains a
linear confinement potential and parameterized one-gluon-exchange potential
which includes a Coulomb type potential and spin-dependent potentials. The
full-heavy tetraquark system is solved by a harmonic oscillator expansion
method. With the same parameters fixed by the charmonium and bottomonium
spectra, we obtained the full spectra for the and -wave heavy tetraquark
states. We find that the narrow structure around 6.9 GeV recently observed at
LHCb in the di- invariant mass spectrum can be naturally explained by
the -wave states. Meanwhile, the observed broad structure
around GeV can be consistently explained by the -wave states
around 6.5 GeV predicted in our previous work. Some contributions from those
suppressed low-lying -wave states around 6.7 GeV are also possible. Other
decay channels are implied in such a scenario and they can be investigated by
future experimental analysis. Considering the large discovery potential at
LHCb, we give our predictions of the -wave states which
can be searched for in the future.Comment: 5 page, 1 figur
Solvent-free selective oxidation of primary and secondary alcohols catalyzed by ruthenium-bis(benzimidazole)pyridinedicarboxylate complex using hydrogen peroxide as an oxidant
AbstractA convenient and selective oxidation of alcohols with aqueous hydrogen peroxide to give the corresponding carbonyl compounds under solvent-free conditions has been developed. By applying ruthenium-bis(benzimidazole)pyridinedicarboxylate complex [Ru(bbp)(pydic)] as catalyst, primary, and secondary alcohols were oxidized to aldehydes and ketones in good yield and excellent selectivity under mild conditions
Focal Spot, Winter 1983/84
https://digitalcommons.wustl.edu/focal_spot_archives/1036/thumbnail.jp
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