10-17 July 2019
Europe/Brussels timezone

New predictions for Lambda_b -> Lambda_c semileptonic decays

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

Campus Ledeganck - Aud. 5


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


William Sutcliffe (Karlsruhe Institute of Technology (KIT))


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