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[en] We address the puzzle of σ(χc1)/σ(χc2) ratio at the collider and fixed-target experiments. We consider several factors that can affect the predicted ratio of the production rates. In particular, we discuss the effect of χcJ polarization, the effect of including next-to-leading order contributions, and the effect of probably different χc1 and χc2 wave functions. (orig.)
Source
Dec 2010; 8 p; ISSN 0418-9833; 