The first evidence for the decay B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb^{-1}, at centre-of-mass energies of 7, 8, and 13 TeV. Here, the D^{**0} meson represents any of the three excited charm mesons D_{1}(2420)^{0}, D_{2}^{*}(2460)^{0}, and D_{1}^{'}(2400)^{0}. The B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} signal is measured with a significance of 3.5σ, including systematic uncertainties. The combined branching fraction B(B^{-}→D_{1,2}^{**0}τ^{-}ν[over ¯]_{τ})×B(D_{1,2}^{**0}→D^{*+}π^{-}), where D_{1,2}^{**0} denotes both D_{1}(2420)^{0} and D_{2}^{*}(2460)^{0} contributions, is measured to be [0.051±0.013(stat)±0.006(syst)±0.009(ext)]%, where the last uncertainty reflects that of the branching fraction of the normalization channel B^{-}→D_{1,2}^{**0}D_{s}^{-}^{(*)}. The ratio between the tauonic and muonic semileptonic B decays, with the latter taken from world average values, is also determined and found to be R(D_{1,2}^{**0})=0.13±0.03(stat)±0.01(syst)±0.02(ext).

Evidence for B- → D**0τ-(ν)over-barτ Decays

Argenton M.;Balboni A.;Bolzonella R.;Calabrese R.;Capriotti L.;Cavallini V.;Couturier B.;Fiorini M.;Franzoso E.;Guarise M.;Kotriakhova S.;Luppi E.;Okamura S.;Pappalardo L. L.;Passalacqua B.;Romolini G.;Tomassetti L.;
2025

Abstract

The first evidence for the decay B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb^{-1}, at centre-of-mass energies of 7, 8, and 13 TeV. Here, the D^{**0} meson represents any of the three excited charm mesons D_{1}(2420)^{0}, D_{2}^{*}(2460)^{0}, and D_{1}^{'}(2400)^{0}. The B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} signal is measured with a significance of 3.5σ, including systematic uncertainties. The combined branching fraction B(B^{-}→D_{1,2}^{**0}τ^{-}ν[over ¯]_{τ})×B(D_{1,2}^{**0}→D^{*+}π^{-}), where D_{1,2}^{**0} denotes both D_{1}(2420)^{0} and D_{2}^{*}(2460)^{0} contributions, is measured to be [0.051±0.013(stat)±0.006(syst)±0.009(ext)]%, where the last uncertainty reflects that of the branching fraction of the normalization channel B^{-}→D_{1,2}^{**0}D_{s}^{-}^{(*)}. The ratio between the tauonic and muonic semileptonic B decays, with the latter taken from world average values, is also determined and found to be R(D_{1,2}^{**0})=0.13±0.03(stat)±0.01(syst)±0.02(ext).
2025
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinen, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2611371
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