144,372 research outputs found
The Electromagnetic Decays of
We calculate the electromagnetic (EM) decay widths of the
meson, which is observed recently by the ATLAS Collaboration. The main EM decay
channels of this particle are and , which, in
literature, are estimated to have the branching ratio of about . In this
work, we get the partial decay widths: keV,
keV and keV. In the
calculation, the instantaneous approximated Bethe-Salpeter method is used. For
the -wave mesons, the wave functions are given by mixing the
and states. Within the Mandelstam formalism, the decay amplitude is
given, which includes the relativistic corrections.Comment: 9 pages, 3 figures, 3 table
The study of light invisible particles in decays
In this paper, we study the light scalar and pseudoscalar invisible particles
in the flavor changing neutral current processes of the meson. Effective
operators are introduced to describe the couplings between quarks and light
invisible particles. The Wilson coefficients are extracted from the
experimental results of the and mesons, which are used to predict the
upper limits of the branching fractions of the similar decay processes for the
meson. The hadronic transition matrix element is calculated with the
instantaneously approximated Bethe-Salpeter method. The upper limits of the
branching fractions when taking different values are presented. It is
found that at some region of , the channel has the largest upper limit which is of the order of
, and for , the largest value of the
upper limits can achieve the order of . Other decay modes, such as
and ,
are also considered.Comment: 24 pages, 35 figure
- β¦