New Physics Effects in $B \to K^(*) \nu \nu$ Decays

TL;DR

This paper provides a model-independent analysis of rare B meson decays involving neutrinos, exploring how new physics could alter decay rates and spectra through various four-fermi interactions.

Contribution

It introduces a comprehensive framework including scalar and tensor interactions to analyze potential new physics effects in $B o K^{(*)} u u$ decays.

Findings

Branching ratios depend on four-fermi interaction coefficients.

Missing mass-squared spectra are sensitive to new physics contributions.

Scalar and tensor interactions can induce lepton number violating decays.

Abstract

We present a model-independent analysis of rare B decays, $B \to K^{(*)} \nu \nu$. The effect of possible new physics is written in terms of dimension-6 four-fermi interactions. The lepton number violating scalar- and tensor-type interactions are included, and they induce $B \to K^{(*)} \nu \nu ({\bar \nu} {\bar \nu})$ decays. We show systematically how the branching ratios and missing mass-squared spectrum depend on the coefficients of the four-fermi interactions.