Coherence effects in deep inelastic scattering

Andersson, Bo; Gustafson, Gösta; Lönnblad, Leif; Pettersson, Ulf

doi:10.1007/bf01550942

Cited by 228 publications

(180 citation statements)

References 13 publications

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“…The momentum p,,;,,,,d transferred as extended sources of gluon radiation, which leads to a suppression of the gluon ra ated gluon radiation. Quarks or diquarks sitting at the ends of a string are considered hadron collisions hard gluons (kinks on strings) are point-lil<e sources of the associ the Lund soft dipole model ( [31]) implemented in the ARIADNE code is used. In actions is provided by the so called soft gluon radiation.…”

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confidence: 99%

Monte Carlo model for multiparticle production at ultrarelativistic energies

et al. 1995

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confidence: 99%

Monte Carlo model for multiparticle production at ultrarelativistic energies

et al. 1995

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“…Higher order QCD effects that produce further hard outgoing partons are generated in both RAPGAP and DJANGOH by parton showers: in RAPGAP the showers are ordered in the transverse momenta (k T ) of the emissions, according to the DGLAP leading log Q 2 approximation. DJANGOH uses the colour dipole model (CDM) [22], in which partons are generated by colour dipoles, spanned between the partons in the cascade. Since the dipoles radiate independently, there is no k T ordering.…”

Section: Qcd Predictionsmentioning

confidence: 99%

Three- and Four-jet Production at Low x at HERA

Turnau¹

2010

Proceedings of European Physical Society Europhysics Conference on High Energy Physics — PoS(EPS-HEP 2009)

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Three-and four-jet production is measured in deep-inelastic ep scattering at low x and Q 2 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 O ( 2 s )and O ( 3 s )and with Monte Carlo simulation programs where higher order effects are approximated by parton showers. A good overall description is provided by the O ( 3 s )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.

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“…The differential cross sections in the laboratory and the Breit frame are compared to different model predictions, namely the MEPS (matrix element and parton shower) model using the RAPGAP event generator [273], CCFM [24][25][26] implemented in the CASCADE program [20,50], the color dipole model (CDM) [274][275][276][277][278][279] using DJANGOH [280] and to predictions by the HERWIG [227,228] event generator. The HERWIG prediction for the Λ cross section is normalized to the observed total cross section, since HERWIG overestimates the cross section by a factor of 3. tion.…”

Section: Main Author C Rislermentioning

confidence: 99%