J particle


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J particle

[′jā ‚pärd·ə·kəl]
(particle physics)
A neutral meson which has a mass of 3095 megaelectronvolts, spin quantum number 1, and negative parity and charge parity; it has an anomalously long lifetime of approximately 10-20 second (corresponding to a width of approximately 70 kiloelectronvolts). Also known as psi particle (symbolized ψ).