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lambda particle

or lambda baryon

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noun Physics.
  1. any of a family of neutral baryons with strangeness −1 or charm +1, and isotopic spin 0. The least massive member of the lambda family was the first strange particle to be discovered. Symbol: Λ
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Origin of lambda particle

First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

lambda particle in Science

lambda particle

  1. An electrically neutral baryon having a mass 2,183 times that of the electron and a mean lifetime of approximately 2.6 X 10-10 seconds. See Table at subatomic particle.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.