Speaker
Description
The recent observation of CP violation in the decay Λb0→ pK-π+π by the LHCb
collaboration, with a significance of 5.2 standard deviations, presents a unique
opportunity to probe physics beyond the Standard Model. While the measured
asymmetry of (2.45 ± 0.46)% is consistent with some hadronic mechanisms within
the Standard Model, its resonant substructure and magnitude suggest potential
contributions from new sources of CP violation. In this work we study the general
two-Higgs doublet model with CP violation in the Yukawa sector and calculate the
contributions to the penguin-dominated four-quark Wilson coefficients entering in
the Λb0 decay. We take into account flavour constraints from $b\to\,s\gamma$
decays, meson oscillations and decays as well as the electron electric dipole moment.
The analysis also incorporates non-perturbative QCD effects through data-driven
dispersive methods for Nπ rescattering amplitudes, minimising theoretical uncertainties
while maximising sensitivity to new physics signatures. Finally, using the vacuum
insertion approximation, we explain the cosmological matter-antimatter asymmetry
through electroweak baryogenesis while simultaneously fitting both the Λb0 and flavour data.
