https://doi.org/10.1140/epja/i2016-16318-4
Regular Article - Theoretical Physics
Remarks on the Pc structures and triangle singularities
1
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, 100190, Beijing, China
2
Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
3
Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
4
Instituto de Física Corpuscular (IFIC), Centro Mixto CSIC-Universidad de Valencia, Institutos de Investigación de Paterna, Aptd. 22085, E-46071, Valencia, Spain
* e-mail: fkguo@itp.ac.cn
** e-mail: zhiyang@hiskp.uni-bonn.de
Received:
25
May
2016
Accepted:
16
September
2016
Published online:
21
October
2016
It was proposed that the narrow structure observed by the LHCb Collaboration in the reaction might be due to a triangle singularity around the -proton threshold at 4.45 GeV. We discuss the occurrence of a similar triangle singularity in the invariant mass distribution for the decay , which could explain the bump around 4.45 GeV in the data. More precise measurements of this process would provide valuable information towards an understanding of the structures.
© SIF, Springer-Verlag Berlin Heidelberg, 2016