218 research outputs found
Quantum bit commitment using Wheeler's delayed choice experiment
We construct a quantum bit commitment scheme using a double-slit setup
similar to Wheeler's delayed choice experiment. Bob sends photons toward the
double-slit, and Alice commits by determining either the slit from which each
photon emerges (for ), or its landing position on a screen (for ).
Since the photon's wave front expands at the speed of light, Alice cannot delay
the detection indefinitely, or it would very soon be out of her control no
matter how much resources she has.Comment: 6 pages, no figure. arXiv admin note: substantial text overlap with
arXiv:0910.264
Three symmetry breakings in strong and radiative decays of strange heavy mesons
In this paper, we investigate three symmetry breaking effects in strong and
radiative decays of strange heavy mesons. We study 1/m_Q corrections within the
heavy quark effect theory, as well as SU(3) and SU(2) symmetry breakings
induced by light quark mass differences and the \eta-\pi mixing vertex. These
effects are studied in a covariant model. The numerical results show that the
1/m_Q corrections of the coupling constants are consistent with \alpha_s
\Lambda_{QCD}/m_Q. The SU(3) symmetry violating effect of the strong coupling
constant is obviously larger than that of the magnetic coupling constant. The
value of the \eta-\pi mixing vertex has some changes because of the renewed
data. As compared with the other theoretical calculations and the experimental
data, our radiative decay rates are much larger than those of the other
theoretical methods, except for \chiPT; however, our branching ratios are close
to the experimental data.Comment: 26 pages, 9 figures; several changes made for further clarity; one
figure and some references added; results and conclusions unchanged, version
to appear in Eur. Phys. J. C. arXiv admin note: substantial text overlap with
arXiv:1401.391
Strong and radiative decays of heavy mesons in a covariant model
In this paper, we investigate symmetry breaking effects in strong and
radiative decays of heavy mesons. We study corrections within the heavy
quark effective theory. These effects are studied in a covariant model for
heavy mesons. The numerical results are consistent with the experimental data
and some other theoretical calculations. These provide a vote of confidence for
the validity of this covariant model.Comment: 35 pages, 7 figures, minor modifications and some references added,
accepted for publication in JHE
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