Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Flavour Physics and CP Violation
Precise predictions for $\Lambda_{b} \rightarrow \Lambda_{c} \ell^{-} \bar{\nu}_{\ell}$ decays
W. Sutcliffe,* F. Bernlochner, Z. Ligeti, D. Robinson
*corresponding author
Full text: Not available
Abstract
These proceedings summarise recent work in which the Standard Model and New Physics form factors of $\Lambda_{b} \rightarrow \Lambda_{c} \ell^{-} \bar{\nu}_{\ell}$ decays were computed up to order $\mathcal{O}(\Lambda^{2}_{\rm QCD} / m^{2}_{c})$ using Heavy Quark Effective Theory (HQET). This allowed for a subsequent HQET-based determination of form factors of the decay using a fit, which combines recent theoretical predictions and experimental measurements. Consequently, the most precise value of $R(\Lambda_{c})$ to date was determined, $R(\Lambda_{c})=0.324 \pm 0.004$. Additionally, the sensitivity of $R(\Lambda_{c})$ to potential NP interactions was explored.
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