Heavy-to-light scalar form factors from Muskhelishvili–Omnès dispersion relations D. -L. Yao, P. Fernandez-Soler, M. Albaladejo, F. -K. Guo and J. Nieves Eur. Phys. J. C, 78 4 (2018) 310 Published online: 18 April 2018 DOI: 10.1140/epjc/s10052-018-5790-4