Invisible Upsilon decays into Light Dark Matter

Abstract

Invisible psi and Upsilon decays into light neutralinos, within the MSSM or N(n)MSSM, are smaller than for nu nubar production, even if light spin-0 particles are coupled to quarks and neutralinos. In a more general way, light dark matter particles are normally forbidden, unless they can annihilate sufficiently through a new interaction stronger than weak interactions (at lower energies), as induced by a light spin-1 U boson, or heavy-fermion exchanges in the case of scalar dark matter. We discuss the possible contributions of U-boson, heavy-fermion, or spin-0 exchanges to invisible psi and Upsilon decays. U-exchanges could lead, but not necessarily, to significant branching fractions for invisible decays into light dark matter. We show how one can get the correct relic density together with sufficiently small invisible branching fractions, and the resulting constraints on the U couplings to ordinary particles and dark matter, in particular |c_chi.f_bV| < 5 10^-3 from Upsilon decays, for 2 m_chi smaller than a few GeV. We also explain why there is no model-independent way to predict psi and Upsilon branching fractions into light dark matter, from dark matter annihilation cross sections at freeze-out time.

10 pages, 9 figures, to appear in Phys. Rev. D

References in corpus (8)

• U-boson production in e+e- annihilations, psi and Upsilon decays, and Light Dark Matter
• Constraints on Light Dark Matter and U bosons, from psi, Upsilon, K+, pi0, eta and eta' decays
• Probing NMSSM Scenarios with Minimal Fine-Tuning by Searching for Decays of the Upsilon to a Light CP-Odd Higgs Boson
• A Search for Invisible Decays of the Upsilon(1S)
• Search for the Invisible Decay of $\jpsi$ in $\psi (2S)\to \pi +{\pi }^{-}J/\psi$
• Rare meson decays into very light neutralinos
• Search for Invisible Decay of the ${\rm Y}(1S)$
• ${\rm Y}$ Decays into Light Scalar Dark Matter

Cited by in corpus (17)

• Heavy quarkonium: progress, puzzles, and opportunities
• "Dark" Z implications for Parity Violation, Rare Meson Decays, and Higgs Physics
• Search for light massive gauge bosons as an explanation of the $(g-2{)}_{\mu }$ anomaly at MAMI
• Direct Detection of sub-GeV Dark Matter with Scintillating Targets
• Signatures of sub-GeV dark matter beams at neutrino experiments
• Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)
• Light dark matter in leptophobic Z' models
• Interactions of Astrophysical Neutrinos with Dark Matter: A model building perspective
• Search for $\eta$ and ${\eta }^{\prime }$ Invisible Decays in $J/\psi \to \varphi \eta$ and $\varphi {\eta }^{\prime }$
• Complementary Constraints on Light Dark Matter from Heavy Quarkonium Decays
• Search for Low-Mass Dark Matter at BABAR
• Exodus: Hidden origin of dark matter and baryons
• The implication of $J/\psi \to (\gamma +)\mathrm{invisible}$ for the effective field theories of neutrino and dark matter
• Constraints on Light Dark Matter from Single-Photon Decays of Heavy Quarkonium
• DUNE potential for sub-GeV dark matter in proton beam dump mode
• Cold Dark Matters in U(1)' Models
• Invisible decays of vector Charmonia and Bottomonia to determine the Weak Mixing Angle at quarkonia scale