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Stable or long-lived neutral particles

Long-lived neutral particles provide a challenge in the construction of particle detectors, because they do not interact electromagnetically, except possibly through their magnetic moments. This means that they do not leave tracks of ionized particles or curve in magnetic fields. Examples of such particles include photons,¹ neutrons,² and neutrinos.³

Other neutral particles

See also: list of mesons and list of baryons

Other neutral particles are very short-lived and decay before they could be detected even if they were charged. They have been observed only indirectly. They include:

• Z bosons⁴
• Dozens of heavy neutral hadrons:
  • Neutral mesons such as the π0⁵ and K0⁶
  • The neutral Delta baryon (Δ0),⁷ and other neutral baryons, such as the Ξ0⁸ and Λ0⁹

See also

• Neutral particle oscillation
• Truly neutral particle

• K. Nakamura et al. (Particle Data Group), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition

References

1. Particle listings - gamma http://pdg.lbl.gov/2011/listings/rpp2011-list-photon.pdf ↩

2. Particle listings – n http://pdg.lbl.gov/2011/listings/rpp2011-list-n.pdf ↩

3. Particle listings - Neutrino Properties http://pdg.lbl.gov/2011/listings/rpp2011-list-neutrino-prop.pdf ↩

4. Particle listings - Z boson http://pdg.lbl.gov/2011/listings/rpp2011-list-z-boson.pdf ↩

5. Particle listings - Pi0 http://pdg.lbl.gov/2011/listings/rpp2011-list-pi-zero.pdf ↩

6. Particle listings - K0 http://pdg.lbl.gov/2011/listings/rpp2011-list-K-zero.pdf ↩

7. Particle listings – Δ(1232) http://pdg.lbl.gov/2011/listings/rpp2011-list-Delta-1232.pdf ↩

8. Particle listings - Xi0 http://pdg.lbl.gov/2011/listings/rpp2011-list-xi-zero.pdf ↩

9. Particle listings - Lambda http://pdg.lbl.gov/2011/listings/rpp2011-list-lambda.pdf ↩