https://doi.org/10.1140/epjc/s10052-016-4448-3
Regular Article - Theoretical Physics
Open charm contributions to the E1 transitions of 
and 
1
Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing, 100049, China
2
Departament de Fisica Quantica i Astrofisica, Universitat de Barcelona, 08028, Barcelona, Spain
3
Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
4
Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha, 410081, China
* e-mail: zhaoq@ihep.ac.cn
Received:
7
September
2016
Accepted:
19
October
2016
Published online:
3
November
2016
The E1 transitions of and are investigated in a non-relativistic effective field theory (NREFT) where the open charm effects are included systematically as the leading corrections. It also allows a self-consistent inclusion of the S–D mixing in the same framework. We are able to show that the open charm contributions are essential for understanding the rather unexpected discrepancies between the non-relativistic leading order calculations and the experimental data for these two low-lying states.
© The Author(s), 2016
