# Measurement of the ratio of ${B}_{c}^{+}$ branching fractions to J/ψπ$^+$ and J/ψμ$^+$ν$_μ$ final states

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Serra, N; Vollhardt, A; et al (2014). Measurement of the ratio of ${B}_{c}^{+}$ branching fractions to J/ψπ$^+$ and J/ψμ$^+$ν$_μ$ final states. Physical Review D (Particles, Fields, Gravitation and Cosmology), 90:032009.

## Abstract

The first measurement that relates semileptonic and hadronic decay rates of the B+c meson is performed using proton-proton collision data corresponding to 1.0  fb$^{−1}$ of integrated luminosity collected with the LHCb detector. The measured value of the ratio of branching fractions, (${B}_{c}^{+}$→J/ψπ+)/B(${B}_{c}^{+}$→J/ψμ+νμ)=0.0469±0.0028(stat)±0.0046(syst), is at the lower end of available theoretical predictions.

## Abstract

The first measurement that relates semileptonic and hadronic decay rates of the B+c meson is performed using proton-proton collision data corresponding to 1.0  fb$^{−1}$ of integrated luminosity collected with the LHCb detector. The measured value of the ratio of branching fractions, (${B}_{c}^{+}$→J/ψπ+)/B(${B}_{c}^{+}$→J/ψμ+νμ)=0.0469±0.0028(stat)±0.0046(syst), is at the lower end of available theoretical predictions.

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