Neutral particle

In physics, a neutral particle is a particle without an electric charge, such as a neutron.

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,^{[PDG 1]} neutrons,^{[PDG 2]} and neutrinos.^{[PDG 3]}

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 bosons^{[PDG 4]}
• Dozens of heavy neutral hadrons:
  • Neutral mesons such as the π^{0
    [PDG 5]} and K^{0
    [PDG 6]}
  • The neutral Delta baryon (Δ⁰
    ),^{[PDG 7]} and other neutral baryons, such as the Ξ^{0
    [PDG 8]} and Λ^{0
    [PDG 9]}

• 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

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