Probing new physics in semileptonic ${\Lambda }_b$ decays

Abstract

In recent times, several hints of lepton non-universality have been observed in semileptonic $B$ meson decays, both in the charged-current ($b\to cl{\bar{\nu }}_l$) and neutral-current ($b\to sll$) transitions. Motivated by these intriguing results, we perform a model independent analysis of the semileptonic ${\Lambda }_b$ decays involving the quark level transitions $b\to (u,c)l{\nu }_l$, in order to scrutinize the nature of new physics. We constrain the new parameter space by using the measured branching ratios of $B_{c,u}^{+}\to {\tau }^{+}{\nu }_{\tau }$, $B\to \pi \tau {\nu }_{\tau }$ processes and the existing experimental results on $R_{D^{(\ast )}}$, $R_{J/\psi }$ and $R_{\pi }^l$ parameters. Using the constrained parameters, we estimate the branching ratios, forward backward asymmetries, hadron and lepton polarization asymmetries of the ${\Lambda }_b\to ({\Lambda }_c,p)l{\nu }_l$ processes. Moreover, we also examine whether there could be any lepton universality violation in these decay modes.

arXiv comment33 pages, 18 figures, to appear in PRD

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• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Impact of ${\Lambda }_b\to {\Lambda }_c\tau \nu$ measurement on New Physics in $b\to cl\nu$ transitions
• Inclusive semileptonic ${\Lambda }_b$ decays in the Standard Model and beyond
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• Further tests of lepton flavour universality from the charged lepton energy distribution in $b\to c$ semileptonic decays: The case of ${\Lambda }_b\to {\Lambda }_c\ell {\bar{\nu }}_{\ell }$
• ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595,2625){\ell }^{-}\bar{\nu }$ form factors from lattice QCD
• The measurable angular distribution of ${\Lambda }_b^0\to {\Lambda }_c^{+}(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• Hadron and lepton tensors in semileptonic decays including new physics
• The role of right-handed neutrinos in $b\to c\tau (\pi {\nu }_{\tau },\rho {\nu }_{\tau },\mu {\bar{\nu }}_{\mu }{\nu }_{\tau }){\bar{\nu }}_{\tau }$ from visible final-state kinematics
• Amplitude analysis of the ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ decay and ${\Lambda }_c^{+}$ baryon polarization measurement in semileptonic beauty hadron decays
• Probing effects of new physics in ${\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$ decays
• New physics and the tau polarization vector in $b\to c\tau {\bar{\nu }}_{\tau }$ decays
• Model independent analysis of $B^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decay processes
• Scrutinizing New Physics in Semi-leptonic $B_c\to J/\psi \tau \nu$ Decay
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
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