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Double parton scattering in ¯pp collisions at √s=1.8TeV

CollaborationWith : Clark, Allan Geoffrey / Couyoumtzelis, Christian / Kambara, Hisanori / Speer, Thomas / Wu, Xin
Published in Physical Review. D. 1997, vol. 56, no. 7, p. 3811-3832
Abstract A strong signal for double parton (DP) scattering is observed in a 16pb−1 sample of ¯pp→γ/π0+3jets+X data from the CDF experiment at the Fermilab Tevatron. In DP events, two separate hard scatterings take place in a single ¯pp collision. We isolate a large sample of data (∼14000events) of which 53% are found to be DP. The process-independent parameter of double parton scattering, σeff, is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings in separate ¯pp collisions. The result σeff=(14.5±1.7+1.7−2.3)mb represents a significant improvement over previous measurements, and is used to constrain simple models of parton spatial density. The Feynman x dependence of σeff is investigated and none is apparent. Further, no evidence is found for kinematic correlations between the two scatterings in DP events.
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CDF COLLABORATION. Double parton scattering in ¯pp collisions at √s=1.8TeV. In: Physical Review. D, 1997, vol. 56, n° 7, p. 3811-3832. doi: 10.1103/PhysRevD.56.3811 https://archive-ouverte.unige.ch/unige:112622

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