lambda-b particle

Science Dictionary
lambda-b particle   (lām'də-bē')  Pronunciation Key 
An electrically neutral baryon having a mass 11,000 times that of the electron and a mean lifetime of approximately 1.1 × 10-12 seconds. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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