Title
Three- and four-jet production at low x at HERAThree- and four-jet production at low x at HERA
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Elementary Particle Physics
Publication type
article
Publication
Berlin,
Subject
Physics
Source (journal)
European physical journal : C : particles and fields. - Berlin
Volume/pages
54(2008):3, p. 389-409
ISSN
1434-6044
ISI
000254206800004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Three- and four-jet production is measured in deep-inelastic ep scattering at low x and Q2 with the H1 detector using an integrated luminosity of 44.2 pb-1. Several phase space regions are selected for the three-jet analysis in order to study the underlying parton dynamics from global topologies to the more restrictive regions of forward jets close to the proton direction. The measurements of cross sections for events with at least three jets are compared to fixed order QCD predictions of and and with Monte Carlo simulation programs where higher order effects are approximated by parton showers. A good overall description is provided by the calculation. Too few events are predicted at the lowest x¡­10-4, especially for topologies with two forward jets. This hints to large contributions at low x from initial state radiation of gluons close to the proton direction and unordered in transverse momentum. The Monte Carlo program in which gluon radiation is generated by the colour dipole model gives a good description of both the three- and the four-jet data in absolute normalisation and shape.
E-info
https://repository.uantwerpen.be/docman/iruaauth/cd8183/06099310a2e.pdf
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