Abstract
The decay of into with the decay into through a triangle diagram is studied. This process is initiated by , and then the decays into and produce the through a triangle loop containing which develops a singularity around 1890 MeV. This process is prohibited by the isospin symmetry, but the decay into this channel is enhanced by the contribution of the triangle diagram, which is sensitive to the mass of the internal particles. We find a narrow peak in the invariant mass distribution, which originates from the amplitude, but is tied to the mass differences between the charged and neutral or states. The observation of the unavoidable peak of the triangle singularity in the isospin-violating production would provide further support for the hadronic molecular picture of the and further information on the interaction.
1 More- Received 6 April 2018
DOI:https://doi.org/10.1103/PhysRevD.97.116004
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society