Year: 2014
Type: article
Abstract: We present a new kit for the study of flavor observables in models beyond the standard model. The setup is based on the public codes SARAH and SPheno and allows for an easy implementation of new observables. The Wilson coefficients of the corresponding operators in the effective lagrangian are computed by SPheno modules written by SARAH. New operators can also be added by the user in a modular way. For this purpose a handy Mathematica package called the PreSARAH has been developed. This uses FeynArts and FormCalc to derive generic form factors at tree- and 1-loop levels and to generate the necessary input files for SARAH. This framework has been used to implement BR( $$\ell _{\alpha } \rightarrow \ell _{\beta } \gamma $$ ), BR( $$\ell _{\alpha } \rightarrow 3\, \ell _{\beta }$$ ), CR( $$\mu -e,A$$ ), BR( $$\tau \rightarrow P \, \ell $$ ), BR( $$h\rightarrow \ell _{\alpha } \ell _{\beta }$$ ), BR( $$Z\rightarrow \ell _{\alpha } \ell _{\beta }$$ ), BR( $$B_{s,d}^0 \rightarrow \ell \bar{\ell }$$ ), BR( $${\bar{B}} \rightarrow X_s\gamma $$ ), BR( $${\bar{B}} \rightarrow X_s \ell \bar{\ell }$$ ), BR( $${\bar{B}} \rightarrow X_{d,s} \nu {\bar{\nu }}$$ ), BR( $$K^+ \rightarrow \pi ^+ \nu {\bar{\nu }}$$ ), BR( $$K_L \rightarrow \pi ^0 \nu {\bar{\nu }}$$ ), $$\varDelta M_{B_s,B_d}$$ , $$\varDelta M_K$$ , $$\varepsilon _K$$ , BR( $$B \rightarrow K \mu \bar{\mu }$$ ), BR( $$B\rightarrow \ell \nu $$ ), BR( $$D_s \rightarrow \ell \nu $$ ) and BR( $$K \rightarrow \ell \nu $$ ) in SARAH. Predictions for these observables can now be obtained in a wide range of SUSY and non-SUSY models. Finally, the user can use the same approach to easily compute additional observables.
Source: The European Physical Journal C
Authors: Werner Porod, Florian Staub, Avelino Vicente
Institutions: University of Würzburg, University of Bonn, University of Liège
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2129535822