PLANCK 2011 - From the Planck Scale to the ElectroWeak Scale

Session

P7 - FLAVOUR AND MFV

1 Jun 2011, 14:00

Main Auditorium (IST Congress Centre)

Conveners

P7 - FLAVOUR AND MFV

• Andreas Weiler

90. Flavour Physics in the Aligned Two-Higgs-Doublet Model

Martin Jung (IFIC)

01/06/2011, 14:00

The alignment in flavour space of the Yukawa matrices of a general two-Higgs-doublet model results in the absence of tree-level flavour-changing neutral currents. In addition to the usual fermion masses and mixings, the aligned Yukawa structure only contains three complex parameters, which are potential new sources of CP violation. For particular values of these three parameters all known...

110. Yukawa Alignment in a Multi Higgs Doublet Model: An effective approach

Hugo Serodio (CFTP-IST)

01/06/2011, 14:15

In the two Higgs doublet model, natural flavour conservation can be achieved through the use of a discrete Z2 symmetry. A less restrictive condition is the requirement of alignment in the Yukawa sector. So far, alignment has been an anzatz, not rooted in a specific model. In this letter we present a model for alignment, which starts with 2+N Higgs doublets, with natural flavour conservation...

103. Minimal Flavour Violation with hierarchical squark masses

Marco Farina (Scuola Normale Superiore and INFN)

01/06/2011, 14:30

In a supersymmetric model with hierarchical squark masses we analyze a pattern of flavour symmetry breaking centered on the special role of the top Yukawa coupling and, by extension, of the full Yukawa couplings for the up-type quarks. For sufficiently heavy squarks of the first and second generation this leads to effective Minimal Flavour Violation of the Flavour Changing Neutral Current...

88. CP Violation in Supersymmetry with Effective Minimal Flavour Violation

Dr David Straub (Scuola Normale Superiore, Pisa)

01/06/2011, 14:45

We analyze CP violation in supersymmetry with Effective Minimal Flavour Violation, where the squarks of the first two generations are much heavier than the third generation ones. Unlike the case of standard Minimal Flavour Violation, we show that all the phases allowed by the flavour symmetry can be sizable without violating existing Electric Dipole Moment constraints, thus solving the SUSY CP...

67. FCNC Effects in a Minimal Theory of Fermion Masses

Dr Robert Ziegler (TUM/IAS Munich)

01/06/2011, 15:00

As a minimal theory of fermion masses we extend the SM by heavy vectorlike fermions that mix with chiral fermions, such that small SM Yukawa couplings arise from small mixing angles. This model can be regarded as an effective description of the fermionic sector of a large class of existing flavor models and thus might serve as a useful reference frame for a further understanding of flavor...

93. Prospects on extensions of the Standard Model with vector-like quarks

Dr Miguel Nebot (U. of Valencia - IFIC)

01/06/2011, 15:15

Modifications of the Standard Model through the inclusion of vector-like quarks (i.e. quarks that are singlets under weak isospin transformations) potentially show signicant deviations in a vast number of predictions, ranging from intensively studied low energy flavour changing processes to high energy electroweak precision data and collider observables. In this talk we address the prospects...

10. B_s -> phi rho^0 and B_s -> phi pi^0 as a handle on isospin-violating New Physics

Dr Lars Hofer (Universität Würzburg)

01/06/2011, 15:30

The 2.5 sigma discrepancy between theory and experiment observed in the difference A_CP(B^- --> pi^0 K^-)-A_CP(Bbar^0 --> pi^+ K^-) can be explained by a new electroweak penguin amplitude. We demonstrate that in presence of a such a new electroweak penguin amplitude the branching ratios of the purely isospin-violating decays B_s --> phi rho^0 and B_s --> phi pi^0 can be enhanced by up to an...

94. News on FCNC Processes through Horizontal Gauge Bosons

Emmanuel Stamou (TUM)

01/06/2011, 15:45

New neutral heavy gauge bosons appear automatically in many extensions of the Standard Model with an extended gauge sector. Typical examples are Z' and gauge-flavour models in which the flavour symmetry, necessary to explain the Standard Model fermion masses and mixings, or a part of it, is gauged. Often, additional heavy exotic fermions must also be introduced to cancel the anomalies from the...