Charmonium mass in nuclear matter
نویسندگان
چکیده
The mass shift of charmonium states in nuclear matter is studied in the perturbative QCD approach. The leading-order effect due to the change of gluon condensate in nuclear matter is evaluated using the leadingorder QCD formula, while the higher-twist effect due to the partial restoration of chiral symmetry is estimated using a hadronic model. We find that while the mass of J/c in nuclear matter decreases only slightly, those of c(3686) and c(3770) states are reduced appreciably. Experimental study of the mass shift of charmonium states in nuclear matter can thus provide valuable information on the changes of the QCD vacuum in nuclear medium.
منابع مشابه
The mass of charmonium in nuclear matter
The masses of charmonium states immersed in nuclear matter are calculated in LO QCD and in QCD sum rules. While the mass shift for J/ψ are found to be less than -10 MeV, those for the χ0,1,2 and ψ(3686) and ψ(3770) are found to be more than -40 MeV. We investigate the feasibility of observing such mass shifts in the future accelerator project at GSI.
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