https://doi.org/10.1140/epjc/s10052-020-08762-6
Regular Article – Theoretical Physics
Triangle singularity as the origin of
and
observed in
1
Department of Physics, School of Science, Tianjin University, 300350, Tianjin, China
2
School of Physics, Beihang University, 100191, Beijing, China
3
College of Physics and Engineering, Qufu Normal University, 273165, Qufu, China
4
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
5
School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, 101408, Beijing, China
6
School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
Received:
3
September
2020
Accepted:
13
December
2020
Published online:
22
December
2020
The LHCb collaboration recently reported the observation of a narrow peak in the invariant mass distributions from the
decay. The peak is parameterized in terms of two resonances
and
with the quark contents
, and their spin-parity quantum numbers are
and
, respectively. We investigate the rescattering processes which may contribute to the
decays. It is shown that the
rescattering via the
loop and the
rescattering via the
loop can simulate the
and
with consistent quantum numbers. Such phenomena are due to the analytical property of the scattering amplitudes with the triangle singularities located to the vicinity of the physical boundary.
© The Author(s) 2020
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