Speaker
Dmitry Bandurin
(Kansas State University)
Description
A sample of photon plus 3-jet events collected in the D0 experiment
with an integrated luminosity of 1fb-1 is used to determine the fraction
of the events with double parton (DP) scattering fDP in a single ppbar
collision at sqrt(s)=1.96TeV. The events are selected with photon
candidate transverse momentum between 60 and 80GeV, leading jet pT above
25GeV and two additional jets with pT above 15GeV. The values of fDP are
measured in three intervals of the second jet transverse momentum pT2
between 15 and 30GeV. We found that the fDP fractions drop with
increasing pT2. In the same three pT2 intervals, we also calculate
an effective cross section sigma_eff, a process-independent parameter
which contains information about the parton densities in the proton
and represents possible parton correlations. The value obtained from
averaging over the three pT2 intervals is sigma_eff= 15.12 +- 1.87 mb.
Authors
Aurelio Juste
(Fermilab)
Horst Wahl
(Florida State University)
Stefan Soldner-Rembold
(University of Manchester)
