Rare hyperon decays with missing energy

Abstract

We explore the strangeness-changing decays of the lightest hyperons into another baryon plus missing energy within and beyond the standard model (SM). In the SM these processes arise from the loop-induced quark transition $s\to d\nu \bar{\nu }$ and their branching fractions are estimated to be less than $10^{-11}$. In the presence of new physics (NP) the rates of these hyperon decays with missing energy could increase significantly with respect to the SM expectations because of modifications to the SM process or contributions from additional modes with new invisible particles. Adopting a model-independent approach and taking into account constraints from the kaon sector, we find that the current data on $K\to \pi \nu \bar{\nu }$ do not permit sizable NP impact on the hyperon decays via underlying operators having mainly parity-even quark parts. In contrast, NP operators with primarily parity-odd quark parts are much less restricted by the existing bounds on $K\to \mathrm{invisible}$ and $K\to \pi \pi \nu \bar{\nu }$ and consequently could produce substantially amplifying effects on the hyperon modes. Their NP-enhanced branching fractions could reach levels potentially observable in the ongoing BESIII experiment.

16 pages, no figure, slightly enlarged, references added, typos corrected, matches publication

References in corpus (22)

• Weak Decays Beyond Leading Logarithms
• The Physics of Heavy Z' Gauge Bosons
• $K_L\to {\pi }^0\nu \bar{\nu }$ Beyond the Standard Model
• $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ and $K_L\to {\pi }^0\nu \bar{\nu }$ in the Standard Model: Status and Perspectives
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• FCNC portals to the dark sector
• Dark matter pair-production in b -> s transitions
• Z'-induced FCNC decays of top, beauty and strange quarks
• Axial Vector $Z^{\prime }$ and Anomaly Cancellation
• Leptoquarks meet ${\epsilon }^{\prime }/\epsilon$ and rare Kaon processes
• Prospects for rare and forbidden hyperon decays at BESIII
• Neutral Hadrons Disappearing into the Darkness
• $R_{K^{(\ast )}}$ and related $b\to s\ell \bar{\ell }$ anomalies in minimal flavor violation framework with $Z^{\prime }$ boson
• Search for invisible decays of ${\pi }^0,\eta ,{\eta }^{\prime },K_S$ and $K_L$: A probe of new physics and tests using the Bell-Steinberger relation
• Augury of Darkness: The Low-Mass Dark Z' Portal
• Scalar Dark Matter and Standard Model with Four Generations
• Sterile neutrinos facing kaon physics experiments
• Minimal Lepton Flavor Violation Implications of the $b\to s$ Anomalies
• Invisible $K_L$ decays as a probe of new physics
• Constraints on new physics from $K\to \pi \nu \bar{\nu }$
• The decays $K\to \pi \pi \nu \overline{\nu }$ within the standard model
• Flavored Dark Sectors running to low energy

Cited by in corpus (14)

• Quark Flavor Phenomenology of the QCD Axion
• FCNC $B$ and $K$ Meson Decays with Light Bosonic Dark Matter
• Searching for dark photons in hyperon decays
• Charged-lepton-flavor violation in $|\Delta S|=1$ hyperon decays
• New physics in $s\to d$ semileptonic transitions: rare hyperon vs. kaon decays
• Exploring leptoquark effects in hyperon and kaon decays with missing energy
• Flavor-changing hyperon decays with light invisible bosons
• Search for a massless particle beyond the Standard Model in the ${\Sigma }^{+}\to p+\mathrm{invisible}$ decay
• Probing new physics with the kaon decays $K\to \pi \pi /E$
• $\Delta S=2$ nonleptonic hyperon decays as probes of new physics
• Charged lepton flavor violating decays with a pair of light dark matter and muonium invisible decay
• ${\Sigma }^{+}\to p{\ell }^{+}{\ell }^{-}$ decays within the standard model and beyond
• New Physics Searches at Kaon and Hyperon Factories
• Search for new physics with baryons at BESIII