Speaker
Description
Several indications of lepton non universality ratios, $R_{D^*}$, $R_{J/ \psi}$ and the measurements on hadronic and $\tau$ longitudinal polarizations in $b \to c \tau \bar{\nu_\tau}$ processes have attracted a lot of attentions. By considering the most general effective Lagrangian, we carry out a model independent analysis of the semileptonic $\Lambda_b$ decays, to inspect the nature of new physics. We constraint the new physics parameter space by using the measured branching ratios of $ {B_c}^+ \to \tau^+ \nu_\tau$ and the keep going experimental results on $R_{D^*}$, $R_{J/ \psi}$ through a chi square fitting. We study the implications of constrained new couplings on the observable such as branching fractions, forward-backward asymmetries, lepton non universality parameter and $ \Lambda_c$ and lepton longitudinal polarization fractions of the decay modes. Additionally, we also probe whether there could be any lepton universality violation in this decay processes.
| What is your topic? | Lepton universality and flavour violation |
|---|
