The first evidence for the decay B− → D**0 τ− anti-ντ 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, D*2(2460)0, and D′1(2400)0. The B− → D**0 τ− anti-ντ signal is measured with a significance of 3.5 σ, including systematic uncertainties. The combined branching fraction BR(B− → D{1,2}{**0} τ− anti-ντ) × BR(D{1,2}{**0} → D*+ π−), where D{1,2}{**0} denotes both D1(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 normalisation channel B− → D{1,2}{**0} Ds(*)−. 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).

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Evidence for B− → D**0 τ− anti-ντ decays. PHYSICAL REVIEW LETTERS, 135(2), 1-15 [10.1103/rj9h-n4w1].

Evidence for B− → D**0 τ− anti-ντ decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

The first evidence for the decay B− → D**0 τ− anti-ντ 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, D*2(2460)0, and D′1(2400)0. The B− → D**0 τ− anti-ντ signal is measured with a significance of 3.5 σ, including systematic uncertainties. The combined branching fraction BR(B− → D{1,2}{**0} τ− anti-ντ) × BR(D{1,2}{**0} → D*+ π−), where D{1,2}{**0} denotes both D1(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 normalisation channel B− → D{1,2}{**0} Ds(*)−. 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., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Evidence for B− → D**0 τ− anti-ντ decays. PHYSICAL REVIEW LETTERS, 135(2), 1-15 [10.1103/rj9h-n4w1].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1035277
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