Bounds on new physics from Bs mixing

U-spin Implication for Bs Physics and New Physics

With U-spin symmetry, b → s and b → d penguin decays could be a subtle probe of CP violating new physics contributions. We show that, for B → PP (P stands for a pseudoscalar meson), the U-spin relation is expected to be violated for only one decay pair by assuming that new physics affects only b → s transition processes. We also very shortly discuss the polarizations of two types of U-spin pair...

Constraining New Physics from D0 −d Mixing

I review constraints on possible New Physics interactions from D−D 0 mixing measurements. I consider the most general low energy effective Hamiltonian and include leading order QCD running of effective operators. I discuss constraints from an extensive list of popular New Physics models, each of which could be discovered at the LHC, that can generate these operators. In most of the scenarios, s...

Bs Decays and Mixing

New Bounds on the String Scale from Flavor Physics

We review the very stringent lower bounds on the string scale that arise from flavor considerations in models with intersecting branes. Despite the absence of a realistic flavor structure at tree level, flavor changing interactions induce a non-trivial pattern of fermion masses and mixing angles when quantum corrections are taken into account. The resulting realistic theory of flavor allows us ...

Naturalness bounds on dipole moments from new physics.

Assuming naturalness that the quantum corrections to the mass should not exceed the order of the observed mass, we derive and apply model-independent bounds on the anomalous magnetic moments and electric dipole moments of leptons and quarks due to new physics.