74 research outputs found
Electromagnetic decays of vector mesons as derived from QCD sum rules
We apply the method of QCD sum rules in the presence of external
electromagnetic fields to the problem of the electromagnetic
decays of various vector mesons, such as , and . The induced condensates obtained previously
from the study of baryon magnetic moments are adopted, thereby ensuring the
parameter-free nature of the present calculation. Further consistency is
reinforced by invoking various QCD sum rules for the meson masses. The
numerical results on the various radiative decays agree very well with the
experimental data.Comment: To appear in Phys. Lett.
(D* to D + gamma) and (B* to B + gamma) as derived from QCD Sum Rules
The method of QCD sum rules in the presence of the external electromagnetic
field is used to analyze radiative decays of charmed or bottomed
mesons such as and , with the
susceptibilities obtained previously from the study of baryon magnetic moments.
Our predictions on decays agree very well with the experimental
data. There are differences among the various theoretical predictions on
decays but the data are not yet available.Comment: 11 pages, Late
Eliminating temporal correlation in quantum-dot entangled photon source by quantum interference
Semiconductor quantum dots, as promising solid-state platform, have exhibited
deterministic photon pair generation with high polarization entanglement
f\textcompwordmark idelity for quantum information applications. However, due
to temporal correlation from inherently cascaded emission, photon
indistinguishability is limited, which restricts their potential scalability to
multi-photon experiments. Here, by utilizing quantum interferences to decouple
polarization entanglement from temporal correlation, we improve multi-photon
entanglement f\textcompwordmark idelity from to . Our work paves the way to realize scalable and high-quality
multi-photon states from quantum dots
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