Neutral particle

In physics, a neutral particle is a particle with no electric charge.

Stable or long-lived neutral particles
Long-lived neutral particles do not decay for a very long time. Examples of such particles include photons, neutrons, and neutrinos.

Other neutral particles
Other neutral particles are very short-lived. They decay before they can be detected by a particle detector. They have been observed only indirectly, such as tracks of ionized particles in a particle accelerator. They include:

Z bosons
Dozens of heavy neutral hadrons:
Neutral mesons such as the pion and kaon
The neutral Delta baryon, and other neutral baryons, such as the xi baryon and lambda baryon

 References 

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