PT Journal AU LHCb Collaboration (Aaij, Rea Jaimes Elles, SJ Jashal, BK Martinez-Vidal, F Oyanguren, A Rebollo De Miguel, M Remon Alepuz, C Ruiz Vidal, J Sanderswood, I TI Measurement of the ratio of branching fractions B(B+c → B0sπ+)/B(B+c → J/ψπ+) SO Journal of High Energy Physics JI J. High Energy Phys. PY 2023 BP 066 EP 19pp VL 07 IS 7 DI 10.1007/JHEP07(2023)066 LA English DE B Physics; Branching fraction; Flavour Physics; Hadron-Hadron Scattering AB The ratio of branching fractions of B-c(+) -> B-s(0)pi(+) and B-c(+) -> J/psi pi(+) decays is measured with proton-proton collision data of a centre-of-mass energy of 13TeV. The data were collected with the LHCb experiment during 2016-2018, corresponding to an integrated luminosity of 5.4 fb(-1). The B-s(0) mesons are reconstructed via the decays B-s(0) -> J/psi phi and B-s(0) -> D-s(-)pi(+). The ratio of branching fractions is measured to be B(B-c(+) -> B-s(0)pi(+))/B(B-c(+) -> J/psi pi(+)) = 91 +/- 10 +/- 8 +/- 3 where the first uncertainty is statistical, the second is systematic and the third is due to the knowledge of the branching fractions of the intermediate state decays. ER