Fermilab experiment E-760 studies the resonant formation of charmonium states in proton-antiproton interactions using a hydrogen gas-jet target in the Antiproton Accumulator ring at Fermilab. Precision measurements of the mass and width of the charmonium states χc1,χc2, a direct measurement of the {ψ}' width, and a new precision measurement of the J/{ψ} mass are presented.
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Armstrong et al. (1992) studied this question.
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