Measurement of the ratio of branching fractions BBc+→Bs0π+/BBc+→J/ψπ+

Abstract

The ratio of branching fractions of Bc+→Bs0π+$$ {B}_c^{+}\to {B}_s^0{\pi}^{+} $$ and Bc+→J/ψπ+$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$ decays is measured with proton-proton collision data of a centre-of-mass energy of 13 TeV. The data were collected with the LHCb experiment during 2016–2018, corresponding to an integrated luminosity of 5.4 fb−1. The Bs0$$ {B}_s^0 $$ mesons are reconstructed via the decays Bs0→J/ψϕ$$ {B}_s^0\to J/\psi \phi $$ and Bs0→Ds−π+$$ {B}_s^0\to {D}_s^{-}{\pi}^{+} $$. The ratio of branching fractions is measured to be BBc+→Bs0π+/BBc+→J/ψπ+=91±10±8±3$$ \mathcal{B}\left({B}_c^{+}\to {B}_s^0{\pi}^{+}\right)/\mathcal{B}\left({B}_c^{+}\to J/\psi {\pi}^{+}\right)=91\pm 10\pm 8\pm 3 $$ 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.