why eta'(958)?

From: "arivero@xxxxxxxxx" <Al.Rivero@xxxxxxxxx>
Date: Mon, 20 Feb 2006 02:46:53 +0000 (UTC)

Can anyone clarify me why the eta' is named with a mass in parenthesis?
I believe this notation is reserved for particles decaying strongly,
wasn't it? On the contrary, eta_c does not carry parenthesis in the
name, nor eta nor pi of course. So?

Alejandro

.

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