What is "eta meson"

n. (context physics English) Either of two mesons made of a mixture of up, down and strange quarks and their antiquarks

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The eta and eta prime meson are mesons made of a mixture of up, down and strange quarks and their antiquarks. The charmed eta meson and bottom eta meson are forms of quarkonium; they have the same spin and parity as the light eta but are made of charm quarks and bottom quarks respectively. The top quark is too heavy to form a similar meson, due to its very fast decay.