pion Hear it!

pion Definition

pion (än′)

noun

Particle Physics any of three short-lived mesons that may be positive, negative, or neutral: pions have a mass c. 270 times that of an electron and play an important role in the binding forces within the nucleus of an atom

Etymology: pi + (mes)on

Related Forms:

  • pionic pi·on′ic (pī änik) adjective
pion Usage Examples

Converse of object

  • charge: It is interesting to notice that there is a huge number of events with 2 charged pions, which is impossible.
  • observe: However, observing a pion moving at relative speed v the quarks would be seen orbiting at speed v orb.
  • produce: Such interactions would typically produce pions and electron-positron pairs.

Adjective modifier

  • neutral: The neutral pions convert directly into photons: Positrons These are identical particles to electrons, having the same characteristics.

Modifies a noun

  • decay: Two red tracks forming a very small angle are most probably two gammas from a neutral pion decay.
  • production: We are also developing and exploiting these strengths for photonuclear reactions leading to charge exchange and pion production.
  • correlator: Testing that the pion correlator of an inverter is an example of an integration test.
  • track: Brigitte Epp's new parameterisation for pion tracks in DC1 data added to jobOptions.

Browse dictionary entries near pion

  1. Pinzón
  2. pinyon
  3. Pinyin
  4. piny
  5. pinxter flower
  6. pinxit
  7. pinworm
  8. pinwheel
  9. pinweed
  10. pinwale
  1. pioneer
  2. pionic
  3. pious
  4. piously
  5. piousness
  6. pip
  7. pipage
  8. pipal
  9. pipe
  10. pipe bomb