eta meson


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eta meson

n.
An electrically neutral meson having a mass 1,071 times that of the electron and a mean lifetime of about 5 × 10-19 second.
References in periodicals archive ?
It produces a particle called an eta meson six times as often as the K meson that theory says should be more prevalent, explains James S.
Out of the billions of particles created in the crashes, they found 47,200 instances in which the interaction produced a particle known as an eta meson.
The unexpectedly high yield of the eta meson suggests that it formed via an intermediate stage in which the pion is excited info a very short-lived state--the exotic meson.