Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-05-22
Eur.Phys.J.C25:495-509,2002
Physics
High Energy Physics
High Energy Physics - Experiment
28 pages, 8 figures and 1 table
Scientific paper
10.1140/epjc/s2002-01039-8
Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in a kinematic region defined by the Bjorken-scaling variables x > 10^(-3), 0.1 < y < 0.6 and photon virtualities 10 <= Q^2 < 100GeV^2. Several observables characterising hadronic final state properties of QCD instanton-induced events are exploited to identify a potentially instanton-enriched domain. While an excess of events with instanton-like topology over the expectation of the standard DIS background is observed it can not be claimed to be significant given the uncertainty of the simulation. Upper limits on the cross-section for instanton-induced processes of between 60pb and 1000pb are set dependent on the kinematic domain considered. The data do not exclude the cross-section predicted by instanton perturbation theory for small instanton sizes. At large instanton sizes a naive extrapolation of instanton perturbation theory yields a cross-section in the range of sensitivity of this study. Such a cross-section is not observed, in agreement with non-perturbative lattice simulations of the QCD vacuum.
Adloff Catherine
H1 Collaboration
No associations
LandOfFree
Search for QCD Instanton-Induced Processes in Deep-Inelastic Scattering at HERA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Search for QCD Instanton-Induced Processes in Deep-Inelastic Scattering at HERA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Search for QCD Instanton-Induced Processes in Deep-Inelastic Scattering at HERA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-32557