publication . Preprint . 2008

Large Top Mass and Non-Linear Representation of Flavour Symmetry

Feldmann, Thorsten; Mannel, Thomas;
Open Access English
  • Published: 11 Jan 2008
Abstract
We consider an effective theory (ET) approach to flavour-violating processes beyond the Standard Model (SM), where the breaking of flavour symmetry is described by spurion fields whose low-energy vacuum expectation values are identified with the SM Yukawa couplings. Insisting on canonical mass dimensions for the spurion fields, the large top-quark Yukawa coupling also implies a large expectation value for the associated spurion, which breaks part of the flavour symmetry already at the UV scale Lambda of the ET. Below that scale, flavour symmetry in the ET is represented in a non-linear way by introducing Goldstone modes for the partly broken flavour symmetry and...
Subjects
arXiv: High Energy Physics::PhenomenologyHigh Energy Physics::LatticeHigh Energy Physics::Experiment
free text keywords: High Energy Physics - Phenomenology, High Energy Physics - Theory
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† Electronic address: mannel@hep.physik.uni-siegen.de [1] G. D'Ambrosio, G. F. Giudice, G. Isidori and A. Strumia,

Nucl. Phys. B 645, 155 (2002). [2] R. S. Chivukula and H. Georgi, Phys. Lett. B 188, 99

(1987). [3] R. D. Peccei and H. R. Quinn, Phys. Rev. D 16, 1791

(1977). [4] S. R. Coleman, J. Wess and B. Zumino, Phys. Rev. 177,

2239 (1969); C. G. Callan, S. R. Coleman, J. Wess and

B. Zumino, Phys. Rev. 177, 2247 (1969). [5] G. Buchalla, A. J. Buras and M. E. Lautenbacher, Rev.

Mod. Phys. 68 (1996) 1125. [6] J. F. Gunion and H. E. Haber, Nucl. Phys. B 272 (1986)

1 [Erratum-ibid. B 402 (1993) 567]. [7] T. Feldmann and T. Mannel, JHEP 0702, 067 (2007). [8] In the following, hatted quantities denote dimensionless

fields are spurions with canonical mass dimension. [9] Notice that for b → sγ the VEV for φD in (38) provides

an additional suppression factor vd/v = cos β. [10] We do not discuss the issue of broken Peccei-Quinn sym-

metry [3] here. A detailed discussion can be found in [1].

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