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Nearly ten years ago, Kang, Ma, Qiu, and Sterman derived an evolution equation for a QQ¯ pair fragmenting into a quarkonium. In this study we explore the consequence of this evolution for the color-evaporation model, focusing on J/ψ transverse-momentum (pt) distributions in proton-proton collisions. We show that, as expected, it softens the spectrum obtained by fixed-order calculations.
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