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  3. Evidence For B^{-}→d^{**0}τ^{-}ν_{τ}[over ¯] Decays.
  1. Home
  3. Evidence For B^{-}→d^{**0}τ^{-}ν_{τ}[over ¯] Decays.

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Evidence for B^{-}→D^{**0}τ^{-}ν_{τ}[over ¯] Decays.

R Aaij1, A S W Abdelmotteleb2, C Abellan Beteta3

  • 1Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

Physical Review Letters
|July 31, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

The LHCb experiment observed the first evidence of the B-meson decay into a D**0 meson and tau lepton. This finding provides new insights into B-meson decays and particle physics at high energies.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Experimental Physics

Background:

  • B-meson decays are crucial for testing the Standard Model of particle physics.
  • Understanding rare B-meson decays can reveal new physics phenomena.
  • Previous studies have focused on decays involving lighter leptons, leaving tauonic decays less explored.

Purpose of the Study:

  • To search for and provide the first evidence of the B-meson decay B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ}.
  • To measure the branching fraction of this decay mode.
  • To investigate the ratio of tauonic to muonic B-meson decays.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment at 7, 8, and 13 TeV.
  • Identification of D^{**0} mesons, which include D_{1}(2420)^{0}, D_{2}^{*}(2460)^{0}, and D_{1}^{'}(2400)^{0} states.
  • Statistical analysis to establish the significance of the observed signal and measure branching fractions.

    • Main Results:

    • First evidence for the decay B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} observed with a 3.5σ significance.
    • Combined branching fraction B(B^{-}→D_{1,2}^{**0}τ^{-}ν[over ¯]_{τ})×B(D_{1,2}^{**0}→D^{*+}π^{-}) measured as [0.051±0.013(stat)±0.006(syst)±0.009(ext)]%.
    • Ratio of tauonic to muonic decays R(D_{1,2}^{**0}) determined to be 0.13±0.03(stat)±0.01(syst)±0.02(ext).

    Conclusions:

    • The observation of B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} provides crucial experimental data for B-physics.
    • The measured branching fraction and ratio R(D_{1,2}^{**0}) can be used to test theoretical models of New Physics.
    • This result contributes to a more comprehensive understanding of semileptonic B-decays involving tau leptons.