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The rare semi-leptonic decays involving orbitally excited final mesons
The rare processes , where
stands for the final meson ,
,~, ,
or~, are studied within the Standard Model. The hadronic matrix
elements are evaluated in the Bethe-Salpeter approach and furthermore a
discussion on the gauge-invariant condition of the annihilation hadronic
currents is presented. Considering the penguin, box, annihilation,
color-favored cascade and color-suppressed cascade contributions, the
observables , , and are
calculated
Two-Body Strong Decay of Z(3930) as the State
The new particle Z(3930) found by the Belle and BaBar Collaborations through
the process is identified to be the
state. Since the mass of this particle is above the threshold, the OZI-allowed two-body strong decays are the main
decay modes. In this paper, these strong decay modes are studied with two
methods. One is the instantaneous Bethe-Salpeter method within Mandelstam
formalism. The other is the combination of the model and the former
formalism. The total decay widths are 26.3 and 27.3 MeV for the methods with or
without the vertex, respectively. The ratio of over
which changes along with the mass of the initial meson
is also presented.Comment: 11 pages, 3 figure
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