When Energy Goes Missing: New Physics in $b\to s\nu \nu$ with Sterile Neutrinos

Abstract

Belle II recently reported the first measurement of $B^{+}\to K^{+}+\mathrm{inv}$, which is $2.8\sigma$ above the Standard Model prediction. We explore the available parameter space of new physics within Standard Model effective field theory extended by sterile neutrinos ($\nu$SMEFT) and provide predictions for the other $B\to K^{(\star )}+\mathrm{inv}$ decay modes and invisible $B_s$ decays. We also briefly comment on charged current decays $B\to D^{(\star )}\ell \bar{\nu }$ and possible ultraviolet completions of the relevant $\nu$SMEFT operators.

19 pages, 5 figures, added comments on other b->s nu nu processes, matches published version

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Cited by in corpus (18)

• Decoding the $B\to K\nu \nu$ excess at Belle II: kinematics, operators, and masses
• Disentangling new physics in $K\to \pi \bar{\nu }\nu$ and $B\to K(K^{\ast })\bar{\nu }\nu$ observables
• $B\to K\nu \bar{\nu }$, MiniBooNE and muon $g-2$ anomalies from a dark sector
• Prospects for searches of $b\to s\nu \bar{\nu }$ decays at FCC-ee
• Correlating $B\to K^{(\ast )}\nu \bar{\nu }$ and flavor anomalies in SMEFT
• Disentangling left and right-handed neutrino effects in $B\to K^{(\ast )}\nu \nu$
• 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
• Searching for signatures of new physics in $B\to K\nu \overline{\nu }$ to distinguish between Dirac and Majorana neutrinos
• $B\to K+$invisible, dark matter, and $CP$ violation in hyperon decays
• Right-handed interactions in puzzling $B$-decays
• Analysis of $q_{\mathrm{rec}}^2$-distribution for $B\to K{M}_X$ and $B\to K^{\ast }{M}_X$ decays in a scalar-mediator dark-matter scenario
• Light dark-matter window constrained by \boldmath$K^{+}\to {\pi }^{+}$$+$$/E$
• Multi-Component Dark Matter from Minimal Flavor Violation
• Scrutinizing dark-matter scenarios with $B\to (K,K^{\ast })\bar{\nu }\nu$ decays
• Probing vector- vs scalar-mediator dark-matter scenarios in $B\to (K,K^{\ast })M_X$ decays
• Belle II Constraints on the Non-Minimal Universal Extra Dimensional Model
• Dark Matter emission at Belle II and NA62 in Minimal Flavor Violation framework