J/psi particle
Definitions
A subatomic particle with an unusually long lifetime (7.2 × 10⁻²¹ s) and a large mass (approx. 3.097 GeV/c²); a bound state of a charm quark and an anti-charm quark (the most common form of charmonium).
Equivalents
Examples
“We report⟳ the observation of a heavy particle J, with mass m = 3.1 GeV and width approximately zero.”
“We denote this resonance as ψ(3105).”
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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