A strong signal for double parton (DP) scattering is observed in a 16 pb(-1) sample of <(p)over bar p> --> gamma/pi(0) + 3 jets + X data from the CDF experiment at the Fermilab Tevatron. In DP events, two separate hard scatterings take place in a single <(p)over bar p> collision. We isolate a large sample of data (similar to 14 000 events) of which 53% are found to be DP. The process-independent parameter of double parton scattering, sigma(eff), is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings in separate <(p)over bar p> collisions. The result sigma(eff) = (14.5 +/- 1.7(-2.3)(+1.7)) mb represents a significant improvement over previous measurements, and is used to constrain simple models of parton spatial density. The Feynman x dependence of sigma(eff) is investigated and none is apparent. Further, no evidence is found for kinematic correlations between the two scatterings in DP events.

F., A., H., A., A., A., M. G., A., S. R., A., D., A., et al. (1997). Double parton scattering in (p)over-bar-p collisions at root s=1.8 TeV. PHYSICAL REVIEW D, 56(7), 3811-3832 [10.1103/PhysRevD.56.3811].

Double parton scattering in (p)over-bar-p collisions at root s=1.8 TeV

PAOLETTI, RICCARDO;
1997-01-01

Abstract

A strong signal for double parton (DP) scattering is observed in a 16 pb(-1) sample of <(p)over bar p> --> gamma/pi(0) + 3 jets + X data from the CDF experiment at the Fermilab Tevatron. In DP events, two separate hard scatterings take place in a single <(p)over bar p> collision. We isolate a large sample of data (similar to 14 000 events) of which 53% are found to be DP. The process-independent parameter of double parton scattering, sigma(eff), is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings in separate <(p)over bar p> collisions. The result sigma(eff) = (14.5 +/- 1.7(-2.3)(+1.7)) mb represents a significant improvement over previous measurements, and is used to constrain simple models of parton spatial density. The Feynman x dependence of sigma(eff) is investigated and none is apparent. Further, no evidence is found for kinematic correlations between the two scatterings in DP events.
1997
F., A., H., A., A., A., M. G., A., S. R., A., D., A., et al. (1997). Double parton scattering in (p)over-bar-p collisions at root s=1.8 TeV. PHYSICAL REVIEW D, 56(7), 3811-3832 [10.1103/PhysRevD.56.3811].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/39063
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