: an unstable neutral fundamental particle of the meson group that has a mass about 6000 times the mass of an electron
called also J particle, J/psi, psi particle
Word History
First Known Use
1977, in the meaning defined above
Cite this Entry
“J/psi particle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/J%2Fpsi%20particle. Accessed 5 Dec. 2023.
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Britannica.com: Encyclopedia article about J/psi particle
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