V particle
In particle physics, V was 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 in cosmic ray interactions in the atmosphere in the late 1940s [1] and were first produced using the Cosmotron particle accelerator at Brookhaven National Laboratory in the 1950s.[2] Since all such particles have now been identified and given specific names, such as K meson or Sigma baryon, 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.[citation needed]
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