https://doi.org/10.1140/epjc/s10052-016-4144-3
Regular Article - Theoretical Physics
and 
scattering in B decays from BaBar and LHCb data
1
Instituto de Física Corpuscular (IFIC), Institutos de Investigación de Paterna, Centro Mixto CSIC-Universidad de Valencia, Aptd. 22085, 46071, Valencia, Spain
2
Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
* e-mail: miguelalbaladejo@gmail.com
Received:
13
April
2016
Accepted:
16
May
2016
Published online:
27
May
2016
We study the experimental DK invariant mass spectra of the reactions [see pdf] , 
(measured by the BaBar collaboration) and 
(measured by the LHCb collaboration), where an enhancement right above the threshold is seen. We show that this enhancement is due to the presence of , which is a DK bound state in the 
sector. We employ a unitarized amplitude with an interaction potential fixed by heavy meson chiral perturbation theory. We obtain a mass 
, and we also show, by means of the Weinberg compositeness condition, that the DK component in the wave function of this state is 
, where the first (second) error is statistical (systematic).
© The Author(s), 2016
