Disentangling left and right-handed neutrino effects in $B\to K^{(\ast )}\nu \nu$

Abstract

The first observation of $\mathcal{B}\left(B^{+}\to K^{+}\nu \nu \right)$ by the Belle II experiment lies almost $3\sigma$ away from the Standard Model expectation. In this letter we study this result in the SMEFT, extended by a light right-handed neutrino. We explore the correlations between the measured decay rate and other observables, such as $\mathcal{B}\left(B\to K^{\ast }\nu \nu \right)$ and $F_L\left(B\to K^{\ast }\nu \nu \right)$, showing that they could disentangle among scenarios involving left-handed neutrinos and those with the right-handed ones. Furthermore, we find that the high-$p_T$ tails of Drell-Yan processes studied at LHC provide important constraints that help us exclude some of the scenarios consistent with the Belle II result.

Matches published version. Few comments added

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Cited by in corpus (7)

• Disentangling new physics in $K\to \pi \bar{\nu }\nu$ and $B\to K(K^{\ast })\bar{\nu }\nu$ observables
• The decay $B\to K+\nu +\bar{\nu }$ at Belle II and a massless bino in R-parity-violating supersymmetry
• Impact of new invisible particles on $B\to K^{(\ast )}{E}_{\mathrm{miss}}$ observables
• Right-handed interactions in puzzling $B$-decays
• Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess
• Dark Matter emission at Belle II and NA62 in Minimal Flavor Violation framework
• Belle II Constraints on the Non-Minimal Universal Extra Dimensional Model