Measurement of the ratio of branching fractions B B c + → B s 0 π + / B B c + → J / ψ π + $$ \mathcal{B}\left({B}_c^{+}\to {B}_s^0{\pi}^{+}\right)/\mathcal{B}\left({B}_c^{+}\to J/\psi {\pi}^{+}\right) $$

Abstract

Abstract

The ratio of branching fractions of

B c +

→

B s 0

π +

$$ {B}_c^{+}\to {B}_s^0{\pi}^{+} $$ and

B c +

→ J / ψ

π +

$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$ 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

B s 0

$$ {B}_s^0 $$ mesons are reconstructed via the decays

B s 0

→ J / ψϕ

$$ {B}_s^0\to J/\psi \phi $$ and

B s 0

→

D s −

π +

$$ {B}_s^0\to {D}_s^{-}{\pi}^{+} $$ . The ratio of branching fractions is measured to be

B

B c +

→

B s 0

π +

/ B

B c +

→ J / ψ

π +

= 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.