Matter effects on $η$ and $η'$ mesons
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We show how the nuclear medium affects the masses of the $η$ and $η'$ mesons. The change should be easily detectable for dense matter and/or strong $η(η')N\bar N$ coupling. We also find that the $η-η'$ mixing angle is less in magnitude in the nuclear matter than in vacuum.
LaTeX file + 5 figures, requires epsf.sty
LaTeX file + 5 figures, requires epsf.sty