J/ψ meson
J/ψRareReal particle, observed in experiments
Fact from the codex
Discovered at two laboratories at once in 1974 – the “November Revolution” that proved the existence of the charm quark.
Data
- Appears from ring
- Ring 1 · LHC ring
- Rarity
- Rare
- Mass
- 3.097 GeV
- Threshold
- 3.097 GeV
- Base rate
- 2.5 %
- Boosted by
- Vertex detector
- Resonance
- Can be tuned as a resonance
- Source
- PDG 2026, Review of Particle Physics, Summary Tables (pdg.lbl.gov/2026)
27 km circumference
per collision, before threshold factor and detector boost
×1.12 frequency per level (+12 %)
