Universal constraints on low-energy flavour models

A bstract It is pointed out that in a general class of flavour models one can identify certain universally present FCNC operators, induced by the exchange of heavy flavour messengers. Their coefficients depend on the rotation angles that connect flavour and fermion mass basis. The lower bounds on th...

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Bibliographic Details
Published inThe journal of high energy physics Vol. 2012; no. 7
Main Authors Calibbi, Lorenzo, Lalak, Zygmunt, Pokorski, Stefan, Ziegler, Robert
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.07.2012
Springer Nature B.V
Subjects
Classical and Quantum Gravitation
Constraint modelling
Elementary Particles
Fermions
Flavors
High energy physics
Lower bounds
Operators
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
Beyond Standard Model
CP violation
Quark Masses and SM Parameters
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Summary:A bstract It is pointed out that in a general class of flavour models one can identify certain universally present FCNC operators, induced by the exchange of heavy flavour messengers. Their coefficients depend on the rotation angles that connect flavour and fermion mass basis. The lower bounds on the messenger scale are derived using updated experimental constraints on the FCNC operators. The obtained bounds are different for different operators and in addition they depend on the chosen set of rotations. Given the sensitivity expected in the forthcoming experiments, the present analysis suggests interesting room for discovering new physics. As the highlights emerge the leptonic processes, μ → eγ , μ → eee and μ → e conversion in nuclei.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP07(2012)004