V particle

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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, as is used in Section 7 of this ATLAS conference note.


  1. ^ G.D.Rochester, C.C.Butler (1947). "Evidence for the Existence of New Unstable Elementary Particles". Nature. 160 (4077): 855. Bibcode:1947Natur.160..855R. doi:10.1038/160855a0.
  2. ^ Pais, Abraham (1986). Inward Bound. Oxford University Press. p. 21.