The first evidence for the decay B-→D∗∗0τ-ν¯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 D1(2420)0, D2∗(2460)0, and D1′(2400)0. The B-→D∗∗0τ-ν¯τ signal is measured with a significance of 3.5σ, including systematic uncertainties. The combined branching fraction B(B-→D1,2∗∗0τ-ν¯τ)×B(D1,2∗∗0→D∗+π-), where D1,2∗∗0 denotes both D1(2420)0 and D2∗(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-→D1,2∗∗0Ds-(∗). 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(D1,2∗∗0)=0.13±0.03(stat)±0.01(syst)±0.02(ext). [The LHCb Collaboration]

Evidence for B−→D**0τ−ντ¯ Decays / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 135:2(2025 Jul 08), pp. 021802.1-021802.15. [10.1103/rj9h-n4w1]

Evidence for B−→D**0τ−ντ¯ Decays

S. Cesare;C. Mancuso;D. Marangotto;A. Merli;N. Neri;G. Tonani;Z. Wang;
2025

Abstract

The first evidence for the decay B-→D∗∗0τ-ν¯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 D1(2420)0, D2∗(2460)0, and D1′(2400)0. The B-→D∗∗0τ-ν¯τ signal is measured with a significance of 3.5σ, including systematic uncertainties. The combined branching fraction B(B-→D1,2∗∗0τ-ν¯τ)×B(D1,2∗∗0→D∗+π-), where D1,2∗∗0 denotes both D1(2420)0 and D2∗(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-→D1,2∗∗0Ds-(∗). 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(D1,2∗∗0)=0.13±0.03(stat)±0.01(syst)±0.02(ext). [The LHCb Collaboration]
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
8-lug-2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1250576
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