Concept

Flavor-changing neutral current

Publications associées (56)

Theories with gauge-mediated supersymmetry breaking

Theories with gauge-mediated supersymmetry breaking provide an interesting alternative to the scenario in which the soft terms of the low-energy fields are induced by gravity. These theories allow for a natural suppression of flavour violations in the supe ...

1999

R-parity violation and unification

Riccardo Rattazzi

The reported anomaly in deep-inelastic scattering at HERA has revived interest in the phenomenology of R-parity violation. From the theoretical point of view, the existence of R-violating interactions poses two considerable problems. The first one concerns ...

1997

Solving the supersymmetric CP problem with Abelian horizontal symmetries

Riccardo Rattazzi

Models that combine Abelian horizontal symmetries and spontaneous CP violation can (i) explain the smallness and hierarchy in quark parameters; (ii) satisfactorily suppress supersymmetric contributions to flavor changing neutral current processes; (iii) so ...

1996

Disoriented sleptons

Riccardo Rattazzi

We discuss some fundamental concerns regarding the recent proposal of Dimopoulos, Giudice and Tetradis for dynamically aligning the soft masses of the sfermions in the minimal supersymmetric standard model (MSSM) with the corresponding fermion masses to su ...

1996

Universal Seesaw and Radiative Quark Mass Hierarchy

Riccardo Rattazzi

A new approach to the fermion mass problem is suggested. The mass hierarchy is first radiatively generated in a sector of heavy isosinglet fermions and then projected to the visible ones by means of a universal seesaw. In this way flavour-changing phenomen ...

1992

Radiative Quark Masses Constrained by the Gauge Group Only

Riccardo Rattazzi

We discuss the possibility of obtaining the observed pattern of quark masses and mixings as a consequence of radiative corrections, gauge invariance and particle content of the theory. We do not allow any kind of additional symmetry, such as family and dis ...

1991

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