New Physics Effects in $B\to K^{(}\ast )\nu \nu$ Decays

Abstract

We present a model-independent analysis of rare B decays, $B\to K^{(\ast )}\nu \nu$. 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 $B\to K^{(\ast )}\nu \nu (\bar{\nu }\bar{\nu })$ decays. We show systematically how the branching ratios and missing mass-squared spectrum depend on the coefficients of the four-fermi interactions.

Comments: 20 pages with 7 figures