https://doi.org/10.1140/epjc/s10052-017-4868-8
Regular Article - Theoretical Physics
The possible
molecular state and its radiative decay
1
School of Science, Tianjin University, Tianjin, 300072, China
2
School of Physics, Nankai University, Tianjin, 300071, China
* e-mail: khw020056@hotmail.com
Received:
28
March
2017
Accepted:
26
April
2017
Published online:
5
May
2017
Recently, several exotic bosons have been confirmed as multi-quark states. However, there are violent disputes about their inner structures, namely if they are molecular states or tetraquarks, or even mixtures of the two structures. It would be interesting to search experimentally for non-strange four-quark states with open charm or bottom which are lighter than or
. Reasonable arguments indicate that they are good candidates of pure molecular states
or
because pions are the lightest boson. Both
and
bound states do not decay via the strong interaction. The
molecule may decay into
by radiating a photon, whereas the
molecule can only decay via weak interaction. In this paper we explore the mass spectra of the
molecular states by solving the corresponding instantaneous B–S equation. Then the rate of radiative decay
is calculated and our numerical results indicate that the processes can be measured by the future experiment. We also briefly discuss the
case. Due to the constraint of the final state phase space it can only decay via weak interaction.
© The Author(s), 2017