A flavor kit for BSM models

By Werner Porod, Florian Staub, Avelino Vicente. 2014

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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($$\ell _{\alpha } \rightarrow \ell _{\beta } \gamma $$ℓα→ℓβγ), BR($$\ell _{\alpha } \rightarrow 3\, \ell _{\beta }$$ℓα→3ℓβ), CR($$\mu -e,A$$μ-e,A), BR($$\tau \rightarrow P \, \ell $$τ→Pℓ), BR($$h\rightarrow \ell _{\alpha } \ell _{\beta }$$h→ℓαℓβ), BR($$Z\rightarrow \ell _{\alpha } \ell _{\beta }$$Z→ℓαℓβ), BR($$B_{s,d}^0 \rightarrow \ell \bar{\ell }$$Bs,d0→ℓℓ¯), BR($${\bar{B}} \rightarrow X_s\gamma $$B¯→Xsγ), BR($${\bar{B}} \rightarrow X_s \ell \bar{\ell }$$B¯→Xsℓℓ¯), BR($${\bar{B}} \rightarrow X_{d,s} \nu {\bar{\nu }}$$B¯→Xd,sνν¯), BR($$K^+ \rightarrow \pi ^+ \nu {\bar{\nu }}$$K+→π+νν¯), BR($$K_L \rightarrow \pi ^0 \nu {\bar{\nu }}$$KL→π0νν¯), $$\varDelta M_{B_s,B_d}$$ΔMBs,Bd, $$\varDelta M_K$$ΔMK, $$\varepsilon _K$$εK, BR($$B \rightarrow K \mu \bar{\mu }$$B→Kμμ¯), BR($$B\rightarrow \ell \nu $$B→ℓν), BR($$D_s \rightarrow \ell \nu $$Ds→ℓν) and BR($$K \rightarrow \ell \nu $$K→ℓν) 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/747a936c53b1c26cd7957ab0343c9e903ad628ff

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In Nuclear and High Energy Physics

  1. Igor P. Ivanov
  2. Florian Staub
  3. P. S. Bhupal Dev
  4. A. Pilaftsis

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