Model-independent method for measuring the angular coefficients of $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays

Abstract

Reconstruction of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ angular distribution is complicated by the strongly-biasing effect of losing the neutrino information from both the $B$ and $\tau$ decays. In this work, a novel method for making unbiased measurements of the angular coefficients while preserving the model independence of the angular technique is demonstrated. The twelve angular functions that describe the signal decay, in addition to background terms, are modelled in a multidimensional fit, using template probability density functions that encapsulate all resolution and acceptance effects. Sensitivities at the LHCb and Belle II experiments are estimated, and sources of systematic uncertainty are discussed, notably in the extrapolation to a measurement of $R(D^{\ast })$.

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Cited by in corpus (15)

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• Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
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• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• A Measurable Angular Distribution for $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ Decays
• Symmetries in $B\to D^{\ast }\ell \nu$ angular observables
• A Complete Framework for Tau Polarimetry in $B\to D^{(\ast )}\tau \nu$ Decays
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• Angular analysis of $B^0\to D^{\ast -}{D}_s^{\ast +}$ with $D_s^{\ast +}\to D_s^{+}\gamma$ decays
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• Addressing the $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ puzzle through New Physics four-fermion operators and their impact on ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay
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• Lepton Flavour Universality tests in $b\to cl\nu$ decays at LHCb