b-s particle

B-s meson

noun Physics.
a neutral meson with a mass 10,507 times that of the electron and a mean lifetime of approximately 1.6 X 10 -12 seconds.
Also called B-s particle.
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American Heritage
Science Dictionary
B-s particle   (bē'ěs')  Pronunciation Key 
An electrically neutral meson having a mass 10,507 times that of the electron and a mean lifetime of approximately 1.6 × 10-12 seconds. See Table at subatomic particle.
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