eta meson

noun

, Physics.

1. a neutral meson with strangeness 0 that is its own antiparticle. : η

Word History and Origins

Origin of eta meson¹

First recorded in 1960–65

Example Sentences

The Brookhaven experiment involved a fast-decaying subatomic particle known as an eta meson, which breaks down into three lighter particles known as pions�one with no electrical charge.

From Time Magazine Archive

About one-thirtieth of the times that a pi meson hit a deuterium nucleus, out came the eta meson, which decays into three pions.

From Time Magazine Archive