B particle

B particle

noun Physics.

Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
B particle  
Either of two subatomic particles in the meson family, one neutral and one positively charged, both of which have masses 10,331 times that of an electron and average lifetimes of 1.6 × 10-12 seconds. B particles contain bottom quarks. See Table at subatomic particle.
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