23,809 research outputs found
The semileptonic baryonic decay
The decay with a proton-antiproton pair in the
final state is unique in the sense that it is the only semileptonic baryonic
decay which is physically allowed in the charmed meson sector. Its measurement
will test our basic knowledge on semileptonic decays and the low-energy
interactions. Taking into account the major intermediate state
contributions from and , we find that its
branching fraction is at the level of . The location and
the nature of state are crucial for the precise determination of the
branching fraction. We wish to trigger a new round of a careful study with the
upcoming more data in BESIII as well as the future super tau-charm factory.Comment: final version, accepted for publication in Phys. Lett.
Branching fractions of semileptonic and decays from the covariant light-front quark model
Based on the predictions of the relevant form factors from the covariant
light-front quark model, we show the branching fractions for the ( or ) decays, where denotes
the pseudoscalar meson, the scalar meson with a mass above 1 GeV, the
vector meson and the axial-vector one. Comparison with the available
experimental results are made, and we find an excellent agreement. The
predictions for other decay modes can be tested in a charm factory, e.g., the
BESIII detector. The future measurements will definitely further enrich our
knowledge on the hadronic transition form factor as well as the inner structure
of the even-parity mesons ( and ).Comment: Predictions on D-> K1(1270), K1(1400) l nu rates correcte
Prediction of the asymmetry in decay
Of all decays, the decay
has the smallest observed branching ratio as it takes place primarily via the
suppressed -exchange diagram. The asymmetry for this mode is yet to be
measured experimentally. By exploiting the relationship among the decay
amplitudes of decays (using isospin and topological
amplitudes) we are able to relate the asymmetries and branching ratios by
a simple expression. This enables us to predict the asymmetry in
. While the predicted central values of
are outside the physically allowed region, they are currently associated with
large uncertainties owing to the large errors in the measurements of the branching ratio (), the other asymmetries
(of ) and (of ). With a precise determination of , and
, one can use our analytical result to predict with a
reduced error and compare it with the experimental measurement when it becomes
available. The correlation between and is an interesting
aspect that can be probed in ongoing and future particle physics experiments
such as LHCb and Belle II.Comment: 21 pages, 6 figures, accepted for publication in JHE
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