v0.28

0.28: SMEFT, lepton flavour violation, D mixing, EDMs

This release brings a large number of new observables as well as changes under the hood.

Treatment of new physics

The treatment of new physics Wilson coefficients was completely overhauled and is now entirely based on the brand new wilson package. Since wilson is capable of RG running and matching the complete set of dimension-6 operators not only in the weak effective theory but also in SMEFT, this opens up many new possibilities for flavio. As a start, it is now possible to use instances of wilson's Wilson class as an argument to functions like np_prediction. The fit classes in flavio.statistics.fits support the new optional arguments fit_wc_eft and fit_wc_basis that allow to directly make fits in a different EFT (e.g. SMEFT) or basis.

New observables

• Various observables in the neutral D meson system have been added. Note that the SM predictions are not really predictions, as the long distance contributions are poorly known, but merely parametrizations accounting for the ballpark of the experimental measurements. For testing CP violating new physics in D mixing, the observable x12Im_D can be used, that is negligibly small in the SM.
• The neutron EDM d_n
• Lepton flavour violating muon and tau decays
  • BR(mu->egamma)
  • BR(mu->eee)
  • BR(tau->egamma)
  • BR(tau->mugamma)
  • BR(tau->eee)
  • BR(tau->mumumu)
  • BR(tau->muee)
  • BR(tau->rhoe)
  • BR(tau->rhomu)
• Hadronic tau decays
  • BR(tau->pinu)
  • BR(tau->Knu)
• Leptonic tau decays
  • BR(tau->mununu)
  • BR(tau->enunu)