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DOI: 10.5445/IR/1000083679
Veröffentlicht am 20.06.2018

Lepton flavour violation in the MSSM: exact diagonalization vs mass expansion

Crivellin, Andreas; Fabisiewicz, Zofia; Materkowska, Weronika; Nierste, Ulrich; Pokorski, Stefan; Rosiek, Janusz

The forthcoming precision data on lepton flavour violating (LFV) decays require precise and efficient calculations in New Physics models. In this article lepton flavour violating processes within the Minimal Supersymmetric Standard Model (MSSM) are calculated using the method based on the Flavour Expansion Theorem, a recently developed technique performing a purely algebraic mass-insertion expansion of the amplitudes. The expansion in both flavour-violating and flavour-conserving off-diagonal terms of sfermion and supersymmetric fermion mass matrices is considered. In this way the relevant processes are expressed directly in terms of the parameters of the MSSM Lagrangian. We also study the decoupling properties of the amplitudes. The results are compared to the corresponding calculations in the mass eigenbasis (i.e. using the exact diagonalization of the mass matrices). Using these methods, we consider the following processes: ℓ → ℓ ′ γ, ℓ→3ℓ ′ , ℓ→2ℓ ′ ℓ ′′ , h→ℓℓ ′ as well as μ→e conversion in nuclei. In the numerical analysis we update the bounds on the flavour changing parameters of the MSSM and examine the sensitivity to the f ... mehr

Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708
URN: urn:nbn:de:swb:90-836798
KITopen ID: 1000083679
Erschienen in Journal of high energy physics
Band 6
Heft 3
Seiten 1-58
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte Supersymmetry Phenomenology
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