3,783 research outputs found
To understand the rare decay
Motivated by the LHCb measurement, we analyze the decay in the kinematics region where the pion pairs
have invariant mass in the range - GeV and muon pairs do not
originate from a resonance. The scalar form factor induced by the
strange current is predicted by the unitarized approach rooted in the
chiral perturbation theory. Using the two-hadron light-cone distribution
amplitude, we then can derive the transition form factor in
the light-cone sum rules approach. Merging these quantities, we present our
results for differential decay width which can generally agree with the
experimental data. More accurate measurements at the LHC and KEKB in future are
helpful to validate our formalism and determine the inputs in this approach.Comment: 8 pages, 4 figures; v2: references added, match the published versio
Radiative Leptonic Decay in Effective Field Theory beyond Leading Order
We study the radiative leptonic decays in the
nonrelativistic QCD effective field theory, and consider a fast-moving photon.
As a result the interactions with the heavy quarks can be integrated out, and
thus we arrive at a factorization formula for the decay amplitude. We calculate
not only the relevant short-distance coefficients at leading order and
next-to-leading order in , but also the nonrelativistic corrections
at the order in our analysis. We find out that the QCD
corrections can sizably decrease the branching ratio and thus is of great
importance in extracting the long-distance operator matrix elements of .
For the phenomenological application, we present our results for the photon
energy, lepton energy and lepton-neutrino invariant mass distribution.Comment: 24 pages, 5 figures, and 2 tables;new references and a new table
added and typos correcte
Predictions of the hidden-charm molecular states with four-quark component
In this work, we study the -type molecular systems systematically
via one pion exchange model, where denotes the narrow meson
or meson and is its antiparticle. With the effective
potentials, we try to find the bound state solutions of the corresponding
systems, which provide crucial information of whether there exist the
-type molecular states. According to our analysis, we predict some
-type molecular states which may be accessible at future experiments
like LHCb and forthcoming BelleII.Comment: 13 pages, 2 figures and 8 tables. Accepted by Eur. Phys. J.
Pseudoscalar Meson and Decuplet Baryon Scattering Lengths
We have systematically calculated the S-wave pseudoscalar meson and decuplet
baryon scattering lengths to the third order in the small scale expansion
scheme of the heavy baryon chiral perturbation theory. We hope the future study
may test the framework and the present predictions.Comment: 14 pages, 1 figures, 9 table
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