Evidence for B- →D∗∗0τ- ντ  ̄ Decays

LHCb Collaboration

doi:10.1103/rj9h-n4w1

Evidence for B- →D∗∗0τ- ντ ̄ Decays

LHCb Collaboration

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
University of Santiago de Compostela
University of Bristol
Department of Physics and Astronomy
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
University of Cincinnati
National Institute for Nuclear Physics
Fakultät Physik
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
CERN
Department of Physics and Astronomy
University of Manchester
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
Centro Brasileiro de Pesquisas Físicas
University of Milan - Bicocca
University of Chinese Academy of Sciences
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
Tsinghua University
CPPM
Institute of Physics
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
University of Oxford
Université Savoie Mont Blanc
Heidelberg University
Laboratoire Leprince-Ringuet

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3 Citas (Scopus)

Resumen

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).

Idioma original	Inglés
Número de artículo	021802
Publicación	Physical Review Letters
Volumen	135
N.º	2
DOI	https://doi.org/10.1103/rj9h-n4w1
Estado	Publicada - 11 jul 2025
Publicado de forma externa	Sí

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@article{1ed7ecb0a55b4f1da20ec1a3dcf802b0,

title = "Evidence for B- →D∗∗0τ- ντ{\= } Decays",

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){\texttimes}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).",

author = "\{LHCb Collaboration\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and Z. Aliouche and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and A. Balboni and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2025 CERN. ",

year = "2025",

month = jul,

day = "11",

doi = "10.1103/rj9h-n4w1",

language = "Ingl{\'e}s",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "2",

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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 - Balboni, A.

AU - Calderon Ramirez, S.

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 - Artículo

C2 - 40743172

AN - SCOPUS:105012802760

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 021802

ER -

Evidence for B- →D∗∗0τ- ντ ̄ Decays

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