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B meson

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noun Physics.

a meson composed of a bottom quark and an up or down antiquark or of a bottom antiquark and an up or down quark.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Also called B particle.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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