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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Search for Sub-GeV Invisible Particles in Inclusive Decays of J/ψ to ϕ.

M Ablikim¹, M N Achasov², P Adlarson³

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Physical Review Letters

|October 25, 2025

Summary

This summary is machine-generated.

Physicists searched for invisible particles (X) in J/ψ decays, finding no significant signal. New upper limits were set for J/ψ→ϕ+X and η→invisible decays, improving sensitivity for sub-GeV invisible particle searches.

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Area of Science:

Particle Physics
High Energy Physics
Experimental Physics

Background:

Searches for new physics beyond the Standard Model often involve looking for invisible particles.
The J/ψ meson is a well-studied system in particle physics, providing a rich source of data for decay studies.

Purpose of the Study:

To search for an invisible particle (X) with a mass between 0 and 0.96 GeV/c² in the J/ψ→ϕ+X decay process.
To set upper limits on the branching fractions of J/ψ→ϕ+X and η→invisible decays.
To establish a new method for searching for sub-GeV invisible particles.

Main Methods:

Utilized a large dataset of J/ψ events collected by the BESIII detector.
Fully reconstructed the ϕ meson and applied efficient vetoes for photons and hadrons.
Determined the recoil mass against the ϕ meson using kinematic constraints.

Main Results:

No significant signal for an invisible particle X was observed in the J/ψ→ϕ+X decay.
An upper limit of 7.0×10⁻⁸ (90% confidence level) was set for the inclusive branching fraction of J/ψ→ϕ+X.
Upper limits for the branching fraction of η→invisible were improved by over 4 times, reaching 2.4×10⁻⁵ (90% confidence level).

Conclusions:

The study provides stringent constraints on the existence of sub-GeV invisible particles.
The developed analysis technique offers a promising avenue for future searches for invisible particles in other decays and experiments.
The results contribute to the ongoing quest for new physics phenomena.