4,282 research outputs found
Isospin violation in via hadronic loops
In this work, we study the isospin-violating decay of
and quantify the electromagnetic (EM) transitions and intermediate meson
exchanges as two major sources of the decay mechanisms. In the EM decays, the
present datum status allows a good constraint on the EM decay form factor in
the vector meson dominance (VMD) model, and it turns out that the EM transition
can only account for about of the branching ratio for . The intermediate meson exchanges, (intermediate
interaction via exchanges), (intermediate
rescattering via kaon exchanges), and
(intermediate rescattering via exchanges), which evade the
naive Okubo-Zweig-Iizuka (OZI) rule, serve as another important contribution to
the isospin violations. They are evaluated with effective Lagrangians where
explicit constraints from experiment can be applied. Combining these three
contributions, we obtain results in good agreement with the experimental data.
This approach is also extended to , where
we find contributions from the , and
loops are negligibly small, and the isospin violation is
likely to be dominated by the EM transition.Comment: Revised version resubmitted to PRD; Additional loop contributions
included; Conclusion unchange
Heavy Quark Spin Symmetry Violating Hadronic Transitions of Higher Charmonia
In heavy quarkonia, hadronic transitions serve as an enlightened probe for
the structure and help to establish the understanding of light quark coupling
with a heavy degree of freedom. Moreover, in recent years, hadronic transitions
revealed remarkable discoveries to identify the new conventional heavy
quarkonia and extracting useful information about the so called "XYZ" exotic
states. In this contribution, we present our predictions for heavy quark spin
symmetry (HQSS) breaking hadronic transitions of higher and wave vector
charmonia based on our recently proposed model (inspired by Nambu-Jona-Lasinio
(NJL) model) to create light meson(s) in heavy quarkonium transitions. We also
suggest spectroscopic quantum numbers for several observed
charmoniumlike states. Our analysis indicates that the is most likely
to be a dominant state.Comment: Proceedings of the talk presented at "XVII International Conference
on Hadron Spectroscopy and Structure (Hadron2017)", 25-29 September 2017,
Salamanca, Spai
Hydrothermal Processing of Biomass and Its Derived Sugar Compounds in Hot-Compressed Gamma-Valerolactone/Water Mixtures
This PhD thesis reports new knowledge on hydrothermal decomposition mechanisms of fructose, glucose, cellobiose, cellulose and lignocellulosic biomass in hot-compressed water/gamma-valerolactone (GVL) mixtures under catalyst-free conditions. GVL is a biomass-derived solvent. The presence of GVL in hot-compressed GVL/water enhances the dehydration reactions but supresses the isomerization reactions of monomers. It also enhances hydrolysis reactions but suppresses the isomerization reactions of glucose polymers and cellulose
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