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Evidence for B- β†’ D[ast][ast]0Ο„-(𝜈)barΟ„ decays

The first evidence for the decay π΅βˆ’β†’π·**0β’πœβˆ’β’β€Ύπœˆπœ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fbβˆ’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...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Dittmann, Lucas (Author) , Esen, Sevda (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Pais, Preema (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schmelling, Michael (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 8 July 2025
In: Physical review letters
Year: 2025, Volume: 135, Issue: 2, Pages: 1-15
ISSN:1079-7114
DOI:10.1103/rj9h-n4w1
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/rj9h-n4w1
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/rj9h-n4w1
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Author Notes:R. Aaij et al. (LHCb Collaboration)
Description
Summary:The first evidence for the decay π΅βˆ’β†’π·**0β’πœβˆ’β’β€Ύπœˆπœ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fbβˆ’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 π΅βˆ’ →𝐷**0β’πœβˆ’β’Β―πœˆπœ signal is measured with a significance of 3.5⁒𝜎, including systematic uncertainties. The combined branching fraction ℬ⁑(π΅βˆ’β†’π·**01,2β’πœβˆ’β’Β―πœˆπœ)×ℬ⁑(𝐷**01,2→𝐷*+β’πœ‹βˆ’), where 𝐷**01,2 denotes both 𝐷1⁒(2420)0 and 𝐷*2⁒(2460)0 contributions, is measured to be [0.051Β±0.013⁒(stat)Β±0.006⁒(syst)Β±0.009⁒(ext)]%, where the last uncertainty reflects that of the branching fraction of the normalization channel π΅βˆ’ →𝐷**01,2β’π·βˆ’π‘ (*). The ratio between the tauonic and muonic semileptonic 𝐡 decays, with the latter taken from world average values, is also determined and found to be ℛ⁑(𝐷**01,2)=0.13Β±0.03⁒(stat)Β±0.01⁒(syst)Β±0.02⁒(ext).
Item Description:The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, M. De Cian, L. Dittmann, S. Esen, F. Glaser, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, P.R. Pais, S.R. Roy, M. Ruiz Diaz, M. Schmelling, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov und weitere 1120
Gesehen am 13.01.2026
Im Titel sind die Zeichen "-", die Zahl "0" und "[ast] hochgestellt, das zweite "Ο„" ist tiefgestellt, das Zeichen "𝜈" steht mit einem Oberstrich
Im Titel ist [ast] als Tropfensternchen dargestellt
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/rj9h-n4w1

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