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The color screening of quarkonia states like $J/\psi$ (bound states of charm and anti-charm) and $\Upsilon$ (bound states of beauty and anti-beauty) is considered one signal of QGP (quark-gluon plasma) formation. This signal is actively measured by experiments at LHC and RHIC.
Why don't we measure the screening on the bound states of light quarks like pions?

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From the introduction to this paper, it's because bound states of heavy quarks have smaller radii than mesons and nucleons. This allows colour screening to effectively shield the whole state, whereas it would not manage to do so for larger structures.

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  • $\begingroup$ pion have same radius as of J/psi and Upsilon states $\endgroup$ – anglina ch Sep 14 '19 at 21:06

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