Abstract:
A strong signal for double parton scattering (DP) is observed in a 16 pb-1 sample of p̄ p → γ + 3 jets + X data from the CDF experiment at the Fermilab Tevatron. The process-independent DP parameter, σeff, is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings at separate p̄ p collisions. The result, σeff = (14.5 ± 1.7-2.3+1.7) mb, represents a significant improvement over previous measurements. For the first time, the Feynman x dependence of the σeff parameter is investigated, and no dependence is seen.
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