A new Dirac matrix identity involving massles particles

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

doi:10.1016/0370-2693(89)91395-6

Cited by 10 publications

(15 citation statements)

References 8 publications

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“…In this Letter, we investigate NLO QCD corrections to two-jet production in various jet algorithms at HERA energies. Previous calculations [3][4][5] were limited to a JADE type algorithm, called W -scheme below. In addition, approximations were made to the matrix elements which, as we will show, are not valid in large regions of phase space.…”

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confidence: 99%

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Dijet production at HERA in next-to-leading order

Mirkes

Zeppenfeld²

1996

Physics Letters B

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Two-jet cross sections in deep inelastic scattering at HERA are calculated in next-to-leading order. The QCD corrections are implemented in a new ep → n jets event generator, MEPJET, which allows to analyze arbitrary jet definition schemes and general cuts in terms of parton 4-momenta. First results are presented for the JADE, the cone and the k T schemes. For the W -scheme, disagreement with previous results and large radiative corrections and recombination scheme dependencies are traced to a common origin.

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confidence: 99%

“…Since, at each phase space point, the parton 4-momenta are available, the program is flexible enough to implement any jet definition algorithms or to impose arbitrary kinematical resolution and acceptance cuts on the final state particles. This is an essential advantage over existing programs such as DISJET [5].…”

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Dijet production at HERA in next-to-leading order

Mirkes

Zeppenfeld²

1996

Physics Letters B

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“…At large values of photon virtuallity Q 2 (typically Q 2 > 100 GeV 2 ) the measured jet cross-section has been shown to be in good agreement [17][18][19][20] with the Monte Carlo model Lepto and next-to-leading order (NLO) perturbative QCD calculations using programs such as Disjet [21] and Projet [22]. In addition, the Ariadne MC also describes the y cut dependence (where y cut is the cut used in the JADE jet-definition, m 2 ij ≤ y cut W 2 ) of the data with a similar accuracy to the one found for Lepto whereas the Q 2 -dependence is not so well described [18,19].…”

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confidence: 99%

Differences between Monte Carlo models for DIS at small-x and the relation to BFKL dynamics

Rathsman

1997

Physics Letters B

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The differences between two standard Monte Carlo models, Lepto and Ariadne, for deep inelastic scattering at small-x is analysed in detail. It is shown that the difference arises from a 'unorthodox' suppression factor used in Ariadne which replaces the normal ratio of parton densities. This gives rise to a factor that qualitatively is similar to what one would expect from BFKL dynamics for some observables like the energy flow and forward jets but not for the 2+1 jet cross-section. It is also discussed how one could use the 2+1 jet cross-section as a probe for BFKL dynamics.

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“…The resulting (3(as2) corrections to R2+l, using the NLO calculations, are considerable: they vary from -20 to +20% when y,,t is varied between 0.01 and 0.06 in the kinematic region used for this study [ 4,3]. The numerical cross section calculations are available in the DISJET program [28] by Brodkorb and Mirkes, and in the PROJET program [ 291 by Graudenz. Both programs agree in their predictions of CY, for a given jet rate and they reproduce the shape of the measured jet rate distributions as a function of ycut well in the investigated kinematic range (see below).…”

Section: O(cys2) Perturbative Qcd Calculationsmentioning

confidence: 99%

Measurement of α from jet rates in deep inelastic scattering at HERA

et al. 1995

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Measurement of \(\alpha_{s}\) from Jet Rates in Deep Inelastic Scattering M. Derrick et al., M.; Botje, M.A.J.; Chlebana, F.S.; Engelen, J.J.; de Kamps, M.; Kooijman, P.M.; Kruse, A.; Tiecke, H.G.J.M.; Verkerke, W.; Vreeswijk, M.; Wiggers, L.W.; de Wolf, E.; van Woudenberg, R.; Dake, A.P. Link to publication Citation for published version (APA): M. Derrick et al., M., Botje, M. A. AbstractJet production in deep inelastic scattering for 120 < Q2 < 3600 GeV' has been studied using data from an integrated luminosity of 3.2 pbb' collected with the ZEUS detector at HERA. Jets are identified with the JADE algorithm. A cut on the angular distribution of parton emission in the y*-parton centre-of-mass system minimises the experimental and theoretical uncertainties in the determination of the jet rates. The jet rates, when compared to 0( (Y,=) perturbative QCD calculations, allow a precise determination of czs (Q) in three Q*-intervals. The values are consistent with a running of crys(Q), as expected from QCD. Extrapolating to Q = 1'14~0 yields a,( Mzo) = 0.117 f. 0.005 (stat) ?igi (syst,,,) f 0.007 (sys&,).r Supported by Worldlab,

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A new Dirac matrix identity involving massles particles

Cited by 10 publications

References 8 publications

Dijet production at HERA in next-to-leading order

Dijet production at HERA in next-to-leading order

Differences between Monte Carlo models for DIS at small-x and the relation to BFKL dynamics

Measurement of α from jet rates in deep inelastic scattering at HERA

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