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We examine angular distributions of leptons arising from the decay of J/ψ in inclusive hadroproduction. Taking into account feed-down contributions from χ1,2, a flat distribution emerges without fine tuning parameters. Changes in the ratio of direct to total J/ψ cross sections would change this distribution significantly. Such angular distributions are, therefore, confirmatory tests of the J/ψ suppression signal for the production of a quark-gluon plasma. Related effects are predicted for the Υ.
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Sourendu Gupta (1998) studied this question.
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