Yuval Grossman

Phenomenology of models with more than two Higgs doublets

Abstract We study the most general Multi-Higgs-Doublet Model (MHDM) with Natural Flavor Conservation (NFC). The couplings of a charged scalar H i ± to up quarks, down quarks and charged leptons depend on three new complex parameters, X i , Y i , and Z i , respectively. We prove relations among these parameters. We carry out a comprehensive analysis of phenomenological constraints on the couplings of the lightest charged scalar: X , Y and Z . We find that the general MHDM may differ significantly from its minimal version, the Two-Higgs-Doublet Model (2HDM).

Non-standard neutrino interactions and neutrino oscillation experiments

Abstract In analyzing neutrino oscillation experiments it is often assumed that while new physics contributes to neutrino masses, neutrino interactions are given by the Standard Model. We develop a formalism to study new physics effects in neutrino interactions using oscillation experiments. We argue that the notion of branching ratio is not appropriate in this case. We show that a neutrino appearance experiment with sensitivity to oscillation probability Pijexp can detect new physics in neutrino interactions if its strength GN satisfies ( G N G F ) 2 ∼ P ij exp . Using our formalism we show how current experiments on neutrino oscillation give bounds on the new interactions in various new physics scenarios.

The Bs width difference beyond the Standard Model

Abstract The Standard Model predicts a large width difference in the B s system. New physics can contribute significantly to the mass difference. If this contribution is CP violating, this will always result in a reduction of the width difference. The analyses of measurements of the width difference using B s decays into CP eigenstates have to be modified in the presence of new physics. We discuss how the width difference and the new CP violating phase in B s mixing can be measured.

Flavor oscillations from a spatially localized source: A Simple general treatment

A unique description avoiding confusion is presented for all flavor oscillation experiments in which particles of a definite flavor are emitted from a localized source. The probability for finding a particle with the wrong flavor must vanish at the position of the source for all times. This condition requires flavor-time and flavor-energy factorizations which determine uniquely the flavor mixture observed at a detector in the oscillation region, i.e., where the overlaps between the wave packets for different mass eigenstates are almost complete. Oscillation periods calculated for {open_quotes}gedanken{close_quotes} time-measurement experiments are shown to give the correct measured oscillation wavelength in space when multiplied by the group velocity. Examples of neutrino propagation in a weak field and in a gravitational field are given. In these cases the relative phase is modified differently for measurements in space and time. Energy-momentum (frequency-wave number) and space-time descriptions are complementary, equally valid, and give the same results. The two identical phase shifts obtained describe the same physics; adding them together to get a factor of 2 is double counting. {copyright} {ital 1997} {ital The American Physical Society}

B → τ + τ − ( X ) decays: First constraints and phenomenological implications

The study of

Neutrino masses and mixing in supersymmetric models without R parity

Bensuremath{rightarrow}{ensuremath{tau}}^{+}{ensuremath{tau}}^{ensuremath{-}}(X)

Lepton mass matrix models

decays can provide us with a better understanding of the third generation, and can be a useful probe of physics beyond the standard model. We present a model-independent analysis of these decays. We classify new physics that can largely enhance the decay rates and we discuss the constraints implied by other processes. Experimentally, flavor-changing neutral current

First limit on inclusive B → Xsνν decay and constraints on new physics

B

QCD corrections to charged Higgs-mediated b → c τ ν decay

decays into final state

The inclusive B → τνX decay in two Higgs doublet models

ensuremath{tau}