Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

New predictions for Lambda_b -> Lambda_c semileptonic decays

Jul 12, 2019, 12:25 PM
15m
Campus Ledeganck - Aud. 5 (Ghent)

Campus Ledeganck - Aud. 5

Ghent

Parallel talk Flavour Physics and CP Violation Flavour Physics and CP Violation

Speaker

William Sutcliffe (Karlsruhe Institute of Technology (KIT))

Description

The heavy quark effective theory makes model independent
predictions for semileptonic $\Lambda_b$ baryon decays in terms of a small
set of parameters. No subleading Isgur-Wise function occurs at order
$\Lambda_{QCD}/m_{c,b}$, and only two sub-subleading functions enter at order
$\left(\Lambda_{QCD}/m_{c}\right)^2$. These features allow us to fit the form factors and decay
rates calculated up to order $\left(\Lambda_{QCD}/m_{c}\right)^2$ to LHCb data and lattice QCD calculations. We derive a significantly more precise standard model
prediction than prior results for the ratio of the rates for
semi-tauonic vs. light-lepton decays. In addition, we investigate the
influence of all possible beyond standard model four-Fermi interactions
and present model independent predictions for them.

Primary authors

Zoltan Ligeti (Lawrence Berkeley National Lab. (US)) Florian Urs Bernlochner (KIT - Karlsruhe Institute of Technology (DE)) William Sutcliffe (Karlsruhe Institute of Technology (KIT)) Dean Robinson (UC Santa Cruz/ LBL)

Presentation materials