QCD Jets at HERA II.O(? s 2 ) four-jet cross-sections

Brodkorb, T.; Körner, Jürgen; Mirkes, E.; Schüler, G.

doi:10.1007/bf01415556

Cited by 20 publications

(19 citation statements)

References 24 publications

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“…The finite phase space regions outside the cutoff are calculated numerically. This method has been used in photoproduction [6,7,8] and in DIS [9,10]. The subtraction method on the other hand is based on a point-bypoint subtraction of singularities in the numerical integration.…”

Section: Introductionmentioning

confidence: 99%

JetViP 1.1: Calculating one- and two-jet cross sections with virtual photons in NLO QCD

Pötter

1999

Computer Physics Communications

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JetViP is a computer program for the calculation of inclusive single-and dijet cross sections in eP -and eγ-scattering in NLO QCD. The virtuality of the photon, radiated by the incoming electron, can be chosen in a continuous range, reaching from photoproduction into deep inelastic scattering. The various contributions to the full jet cross section, including the resolved photon contributions, are implemented. The calculation is based on the phase-spaceslicing method. Nature of physical problem:In eP -and eγ-scattering experiments, the hadronic final state can be analysed by jet cluster algorithms, yielding inclusive single-and dijet cross sections. These can be obtained in a continuous range of photon virtuality. The cross sections allow the extraction of parameters, such as α s , Λ MS or parton densities (also of the virtual photon), if the respective jet cross sections are theoretically known. Method of solution:JetViP is a computer program for the calculation of inclusive singleand dijet cross sections in eP -and eγ-scattering in NLO QCD. The virtuality of the photon, radiated by the incoming electron, can be chosen in a continuous range, reaching from photoproduction into deep inelastic scattering. The various contributions to the full jet cross section, including the resolved photon contributions, are implemented. The calculation is based on the phase-space-slicing method. Typical running time:Varies strongly from LO to NLO and depends on type of subprocess (direct or resolved). At LO, running times of about 1 minute for a cross section with fixed bin-size in one of the kinematical variables are typical. At NLO, the running time for such a cross section varies between 30 minutes (for the single resolved contributions) to 5 hours (for the double resolved contributions).2

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Section: Introductionmentioning

confidence: 99%

JetViP 1.1: Calculating one- and two-jet cross sections with virtual photons in NLO QCD

Pötter

1999

Computer Physics Communications

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“…Figure 4 shows the forward di-jet rate versus W for a value of ^cut =s= 0.04. As predicted by leading-order perturbative QCD [14], the forward di-jet rate falls as ^increases. Also shown are the Lund model ME and PS predictions.…”

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confidence: 58%

First measurements of jet production rates in deep-inelastic lepton-proton scattering

et al. 1992

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The first measurements of forward multijet rates in deep-inelastic lepton scattering are presented. Data were taken with a 490-GeV muon beam incident on a hydrogen target. The jets were defined using the JADE algorithm. The measured rates are presented as a function of the jet resolution parameter >>cut, and as a function of the virtual-photon-proton center-of-momentum energy W, in the range 13 < W < 33 GeV. Comparisons are made to the predictions of the Lund Monte Carlo programs, and good agreement is obtained when QCD corrections are included in the model.

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“…where y c is the resolution parameter for which we choose y c = 0.04 [14,15]. M 0 is an additional fixed mass cut which we have introduced in order to clearly separate the perturbative and non-perturbative regime in the case, where W 2 is small.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…can be parametrized by seven kinematical variables [15], which we choose as y, Q 2 , z ′ , φ, s 23 , cos θ 23 and φ 23 where y and Q 2 are already defined in (2). s 23 denotes the squared invariant mass of partons 2 and 3…”

Section: Four Jet Cross Sectionsmentioning

confidence: 99%

Jet production in polarized lepton-hadron scattering

Mirkes

Ziegler

1994

Nuclear Physics B

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We calculate exact analytical expressions for O(α s ) 3-jet and O(α 2 s ) 4-jet cross sections in polarized deep inelastic lepton nucleon scattering. Introducing an invariant jet definition scheme, we present differential distributions of 3-and 4-jet cross sections in the basic kinematical variables x and W 2 as well as total jet cross sections and show their dependence on the chosen spin-dependent (polarized) parton distributions. Noticebly differences in the predictions are found for the two extreme choices, i.e. a large negative sea-quark density or a large positive gluon density. Therefore, it may be possible to discriminate between different parametrizations of polarized parton densities, and hence between the different physical pictures of the proton spin underlying these parametrizations.

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QCD Jets at HERA II.O(? s 2 ) four-jet cross-sections

Cited by 20 publications

References 24 publications

JetViP 1.1: Calculating one- and two-jet cross sections with virtual photons in NLO QCD

JetViP 1.1: Calculating one- and two-jet cross sections with virtual photons in NLO QCD

First measurements of jet production rates in deep-inelastic lepton-proton scattering

Jet production in polarized lepton-hadron scattering

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