281 research outputs found
Weak decays of pseudo Goldstone bosons
A short overview of recent progress in describing kaon and pion decays within
Chiral Perturbation Theory is presented. Particular attention is devoted to the
issues of final-state interactions and isospin breaking in , as
well as to the estimate of long-distance contributions in .Comment: 13 pages, invited talk at Chiral Dynamics 2000, Newport News, USA,
17-22 July 200
Flavour Physics and Implication for New Phenomena
Flavour physics represents one of the most interesting and, at the same time,
less understood sector of the Standard Theory. On the one hand, the peculiar
pattern of quark and lepton masses, and their mixing angles, may be the clue to
some new dynamics occurring at high-energy scales. On the other hand, the
strong suppression of flavour-changing neutral-current processes, predicted by
the Standard Theory and confirmed by experiments, represents a serious
challenge to extend the Theory. This article reviews both these aspects of
flavour physics from a theoretical perspective.Comment: Contribution to "The Standard Theory up to the Higgs discovery - 60
years of CERN", Ed. by L. Maiani and G. Rolandi (v2: minor typos corrected
Supersymmetric effects in rare semileptonic decays of B and K mesons
Rare flavour-changing neutral-current transitions of the type and are analysed
in supersymmetric extensions of the Standard Model with generic flavour
couplings. It is shown that these processes are particularly sensitive to the
left--right mixing of the squarks and that, in the presence of non-universal
terms, they could lead to unambiguous signatures of new physics in
exclusive and meson decays.Comment: 15 pages, Latex, invited talk at RADCOR 2000 (Carmel CA, USA, Sept.
2000
Theory of radiative and rare B decays
We present a concise theoretical overview of radiative and rare B decays
mediated by flavour-changing neutral-current transitions of the type
b->s(d)gamma and b->s(d)l+l-.Comment: 7 pages, 4 figures. Talk given at 9th International Conference on B
Physics at Hadron Machines (Beauty 2003), Pittsburgh, Pennsylvania, 14-18 Oct
200
Effective theories of electroweak symmetry breaking
We present a brief review of recent attempts to construct effective theories
to describe the breaking of the electroweak symmetry in extensions of the
Standard Model with new strongly interacting dynamics around the TeV scale.
Particular attention is devoted to the analogies of Higgsless models with
Chiral Perturbation Theory (the low-energy limit of QCD).Comment: 12 pages, invited talk at the 6th International Workshop on Chiral
Dynamics, CD09, July 6-10, 2009, Bern, Switzerland (v2: minor typos
corrected)
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