https://doi.org/10.1140/epjc/s10052-017-5169-y
Regular Article - Theoretical Physics
Triangle singularities in
and
Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo.22085, 46071, Valencia, Spain
* e-mail: rpavao@ific.uv.es
Received:
6
July
2017
Accepted:
24
August
2017
Published online:
11
September
2017
The possible role of the triangle mechanism in the decay into
and
is investigated. In this process, the triangle singularity appears from the decay of
into
followed by the decay of
into
and the fusion of the
, which forms the
or
, which finally decay into
or
, respectively. The triangle mechanism from the
loop generates a peak around 1420 MeV in the invariant mass of
or
, and it gives sizable branching fractions,
and
.
© The Author(s), 2017