6–13 Jul 2022
Bologna, Italy
Europe/Rome timezone

Beauty hadron semileptonic decays in the Standard Model and beyond

8 Jul 2022, 18:25
17m
Room 9 (Indaco)

Room 9 (Indaco)

Parallel Talk Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics

Speaker

Francesco Loparco (Istituto Nazionale di Fisica Nucleare)

Description

I discuss exclusive $B_c$ decays. FIrst I consider the case of semileptonic modes $B_c^+\to B_a\bar{l}\nu_l$ and $B_c^+\to B^*_a(\to B_a\gamma)\bar{l}\nu_l$, with $a=s,d$ and $l = e,\mu$ in the Standard Model (SM) and in its extension based on the low-energy Hamiltonian comprising the full set of dimension-6 semileptonic $c\to s,d$ operators with left-handed neutrinos. Heavy quark spin symmetry has been used to relate the relevant hadronic matrix elements and to exploit lattice QCD results on $B_c$ form factors. Optimised observables are selected, and the pattern of their correlations is studied to identify the effects of the various operators in the extended low-energy Hamiltonian.
Furthermore, I present the analysis for $B_c^+\to B^{(*)+}\nu\bar{\nu}$ decays, for which branching fractions of at most $\mathcal{O}(10^{-16})$ are predicted in the SM. New physics effects are discussed also in this case.
Perspectives on inclusive semileptonic $\Lambda_b^0$ decays will be briefly discussed.

In-person participation Yes

Primary author

Francesco Loparco (Istituto Nazionale di Fisica Nucleare)

Presentation materials