This PR fixes the following issues in the implementation of the CL Wilson coefficient used in $B\to K^{(\ast)}\nu\nu$ and $K\to \pi^{(\ast)}\nu\nu$:
CL is defined at $M_Z$. Since the product of CL_SM * alpha_e is scale invariant, CL at lower scales is determined from the running of alpha_e.
The implementation of the Xt loop function that enters the SM prediction of CL did not take into account the remaining scale dependence in the NLO QCD result. As a temporary fix, it has been replaced by the parameter Xt_di->djnunu taken from arXiv:2105.02868 Eq. (5).
This PR fixes the following issues in the implementation of the
CLWilson coefficient used in $B\to K^{(\ast)}\nu\nu$ and $K\to \pi^{(\ast)}\nu\nu$:CLis defined at $M_Z$. Since the product ofCL_SM * alpha_eis scale invariant,CLat lower scales is determined from the running ofalpha_e.Xtloop function that enters the SM prediction ofCLdid not take into account the remaining scale dependence in the NLO QCD result. As a temporary fix, it has been replaced by the parameterXt_di->djnunutaken from arXiv:2105.02868 Eq. (5).