Observation of the semileptonic decay B+→pp¯μ+νμ$$ {B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu } $$

Abstract

Abstract

The Cabibbo-suppressed semileptonic decay B+→pp¯μ+νμ$$ {B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu } $$ is observed for the first time using a sample of pp collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.7 fb−1 at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The differential branching fraction is measured as a function of the pp¯$$ p\overline{p} $$ invariant mass using the decay mode B+→ J/ψK+ for normalisation. The total branching fraction is measured to be

ℬ

B +

→ p

p ¯

μ +

ν μ

=

5.27

− 0.24

+ 0.23

± 0.21 ± 0.15

×

10

− 6

,

$$ \mathrm{\mathcal{B}}\left({B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu}\right)=\left({5.27}_{-0.24}^{+0.23}\pm 0.21\pm 0.15\right)\times {10}^{-6}, $$

where the first uncertainty is statistical, the second systematic and the third is from the uncertainty on the branching fraction of the normalisation channel.