Measurement of the Branching Fraction Ratios R ( D + ) and R ( D * + ) Using Muonic τ Decays

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doi:10.1103/PhysRevLett.134.061801

Measurement of the Branching Fraction Ratios $R (D^{+})$ and $R (D^{* +})$ Using Muonic $τ$ Decays

Journal Article · Sun Feb 09 23:00:00 EST 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.134.061801· OSTI ID:2513919

; ; Abellan Beteta, C.; ; ; ; ; ; ; ; ; Ajaltouni, Z.; ; ; ; ; ; ; ; more »

The branching fraction ratios of ${\bar{B}}^{0} \to D^{+} τ^{-} {\bar{ν}}_{τ}$ and ${\bar{B}}^{0} \to D^{* +} τ^{-} {\bar{ν}}_{τ}$ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of $2.0 {fb}^{- 1}$ collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 13 TeV$ . The reconstructed final states are formed by combining $D^{+}$ mesons with $τ^{-} \to μ^{-} {\bar{ν}}_{μ} ν_{τ}$ candidates, where the $D^{+}$ is reconstructed via the $D^{+} \to K^{-} π^{+} π^{+}$ decay. The results are $R (D^{+}) = 0.249 \pm 0.043 \pm 0.047$ , $R (D^{* +}) = 0.402 \pm 0.081 \pm 0.085$ , where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of $- 0.39$ and are compatible with the standard model.

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI ID:: 2513919

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 134; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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