Eur. Phys. J. C (2016) 76: 300
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

Abstract

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).