• Open Access

Observation of the Decay Λb0Λc+τν¯τ

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 128, 191803 – Published 13 May 2022
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Abstract

The first observation of the semileptonic b-baryon decay Λb0Λc+τν¯τ, with a significance of 6.1σ, is reported using a data sample corresponding to 3fb1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λb0Λc+τν¯τ)/B(Λb0Λc+ππ+π) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λb0Λc+τν¯τ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λb0Λc+ππ+π. The ratio of semileptonic branching fractions R(Λc+)B(Λb0Λc+τν¯τ)/B(Λb0Λc+μν¯μ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λb0Λc+μν¯μ contributes to the last term. This result is in agreement with the standard model prediction.

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  • Received 11 January 2022
  • Accepted 29 March 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.191803

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2022 CERN, for the LHCb Collaboration

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Vol. 128, Iss. 19 — 13 May 2022

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