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, ${\cal B}(B_c^+ \to J/\psi \pi^+)/{\cal B}(B_c^+\to J/\psi\mu^+\nu_\mu)=0.0469 \pm 0.0028 (stat.) \pm 0.0046 (syst.)$, is at the lower end of available theoretical predictions.
Highlights
The Bþc meson is the ground state of the bc quark-pair system and is the only meson in which weak-interaction decays of both constituents compete with each other [1].About 70% of the decay width is expected to be due to the c → s transition, favored by the Cabibbo–Kobayashi–Maskawa quark-coupling hierarchy [2]
About 70% of the decay width is expected to be due to the c → s transition, favored by the Cabibbo–Kobayashi–Maskawa quark-coupling hierarchy [2]
The complementary b → c transition, which is predicted to account for 20% of the decay width, is more straightforward to observe experimentally, having a substantial probability to produce a J=ψ meson
Summary
The Bþc meson is the ground state of the bc quark-pair system and is the only meson in which weak-interaction decays of both constituents compete with each other [1]. The complementary b → c transition, which is predicted to account for 20% of the decay width, is more straightforward to observe experimentally, having a substantial probability to produce a J=ψ meson. Among such decays, semileptonic Bþc → J=ψlþνlðl 1⁄4 μ; eÞ and hadronic Bþc → J=ψπþ channels have played a special role in many measurements. The Bþc → J=ψπþ decays were used to measure its lifetime [8], mass [9,10,11], production cross section at the LHC [11] and as a reference for other hadronic branching fraction measurements [12,13,14,15,16,17].
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