Skip to main navigation Skip to search Skip to main content

Evidence for B- →D∗∗0τ- ντ ¯ Decays

  • LHCb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The first evidence for the decay 𝐵−→𝐷**0⁢𝜏−⁢‾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−⁢¯𝜈𝜏 signal is measured with a significance of 3.5⁢𝜎, including systematic uncertainties. The combined branching fraction ℬ⁡(𝐵−→𝐷**01,2⁢𝜏−⁢¯𝜈𝜏)×ℬ⁡(𝐷**01,2→𝐷*+⁢𝜋−), where 𝐷**01,2 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 normalization channel 𝐵− →𝐷**01,2⁢𝐷−𝑠(*). 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**01,2)=0.13±0.03⁢(stat)±0.01⁢(syst)±0.02⁢(ext).
Original languageEnglish
Article number021802
Pages (from-to)1-15
Number of pages15
JournalPhysical review letters
Volume135
Issue number2
Early online date8 Jul 2025
DOIs
Publication statusPublished - 11 Jul 2025

Fingerprint

Dive into the research topics of 'Evidence for B- →D∗∗0τ- ντ ¯ Decays'. Together they form a unique fingerprint.

Cite this