TY - JOUR
T1 - Evidence for B- →D∗∗0τ- ντ ¯ Decays
AU - LHCb Collaboration
AU - Aaij, R.
AU - Abdelmotteleb, A. S.W.
AU - Abellan Beteta, C.
AU - Abudinén, F.
AU - Ackernley, T.
AU - Adefisoye, A. A.
AU - Adeva, B.
AU - Adinolfi, M.
AU - Adlarson, P.
AU - Agapopoulou, C.
AU - Aidala, C. A.
AU - Ajaltouni, Z.
AU - Akar, S.
AU - Akiba, K.
AU - Albicocco, P.
AU - Albrecht, J.
AU - Alessio, F.
AU - Aliouche, Z.
AU - Alvarez Cartelle, P.
AU - Amalric, R.
AU - Amato, S.
AU - Amey, J. L.
AU - Amhis, Y.
AU - An, L.
AU - Anderlini, L.
AU - Andersson, M.
AU - Andreianov, A.
AU - Andreola, P.
AU - Andreotti, M.
AU - Andreou, D.
AU - Anelli, A.
AU - Ao, D.
AU - Archilli, F.
AU - Argenton, M.
AU - Arguedas Cuendis, S.
AU - Artamonov, A.
AU - Artuso, M.
AU - Aslanides, E.
AU - Ataíde Da Silva, R.
AU - Atzeni, M.
AU - Audurier, B.
AU - Bacher, D.
AU - Bachiller Perea, I.
AU - Bachmann, S.
AU - Bachmayer, M.
AU - Back, J. J.
AU - Baladron Rodriguez, P.
AU - Balagura, V.
AU - Fleuret, F.
AU - Maurice, E.
N1 - Publisher Copyright:
© 2025 CERN.
PY - 2025/7/11
Y1 - 2025/7/11
N2 - 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).
AB - 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).
UR - https://www.scopus.com/pages/publications/105012802760
U2 - 10.1103/rj9h-n4w1
DO - 10.1103/rj9h-n4w1
M3 - Article
C2 - 40743172
AN - SCOPUS:105012802760
SN - 0031-9007
VL - 135
JO - Physical Review Letters
JF - Physical Review Letters
IS - 2
M1 - 021802
ER -