623 research outputs found
Violation of a Bell inequality in particle physics experimentally verified?
Relevant aspects for testing Bell inequalities with entangled meson-antimeson
systems are analyzed. In particular, we argue that the result of A. Go, J. Mod.
Optics 51, 991 (2004), which nicely illustrate the quantum entanglement of
B-meson pairs, cannot be considered as a Bell-test refuting local realism.Comment: 9 page
Quantitative complementarity in two-path interferometry
The quantitative formulation of Bohr's complementarity proposed by
Greenberger and Yasin is applied to some physical situations for which
analytical expressions are available. This includes a variety of conventional
double-slit experiments, but also particle oscillations, as in the case of the
neutral-kaon system, and Mott scattering of identical nuclei. For all these
cases, a unified description can be achieved including a new parameter, ,
which quantifies the effective number of fringes one can observe in each
specific interferometric set-up.Comment: 11 RevTex pages, 5 figure
Mixing of eta-eta' Mesons in J/psi Decays into a Vector and a Pseudoscalar Meson
The octet-singlet mixing angle in the pseudoscalar meson nonet is
deduced from the rich set of accurate data on decays into a vector and
a pseudoscalar meson. Corrections due to non-ideal - mixing have
been included for the first time and turn out to be crucial to find degrees, which is appreciably less negative than previous
results coming from similar analyses.Comment: 9 pages, LaTeX, full postscript file available via anonymous ftp at
ftp://ftp.ifae.es/preprint/ft/uabft412.p
CP Measurement in Quantum Teleportation of Neutral Mesons
Quantum teleportation using neutral pseudoscalar mesons shows novel
connections between particle physics and quantum information. The projection
basis, which is crucial in the teleportation process, is determined by the
conservation laws of particle physics, and is different from the Bell basis, as
in the usual case. Here we show that one can verify the teleportation process
by CP measurement. This method significantly simplifies the high energy quantum
teleportation protocol. Especially, it is rigorous, and is independent of
whether CP is violated in weak decays. This method can also be applied to
general verification of Einstein-Podolsky-Rosen correlations in particle
physics.Comment: 7 page
The Mixing Angle Revisited
The value of the mixing angle is phenomenologically
deduced from a rather exhaustive and up-to-date analysis of data including
strong decays of tensor and higher-spin mesons, electromagnetic decays of
vector and pseudoscalar mesons, decays into a vector and a
pseudoscalar meson, and other transitions. A value of between
and is consistent with all the present experimental
evidence and the average seems to be
favoured.Comment: 17 pages, LaTeX. 2 references added, some comments on Chiral
Perturbation Theor
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