V particle
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In particle physics, V is a generic name for heavy, unstable subatomic particles that decay into a pair of particles, thereby producing a characteristic letter V in a bubble chamber or other particle detector. Such particles were first detected using the Cosmotron particle accelerator at Brookhaven National Laboratory in the 1950's. Since all such particles have now been identified and given specific names, this term has fallen into disuse. V0 is still used on occasion to refer generally to neutral particles that may confuse the B-tagging algorithms in a modern particle detector.
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