Jet cross sections in leptoproduction from QCD

Rumpf, Ch.; Krämer, G.; Willrodt, J.

doi:10.1007/bf01431566

Cited by 22 publications

(3 citation statements)

References 31 publications

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“…Both jets are produced back-to-back and with identical P T in the centre-of-mass frame of gauge boson and proton, cos(nφ) and sin(nφ) vanish consequently in the integrated jet rate. Only by restricting the final state configuration by cuts on the jet direction, such as suggested for example in [10], we obtain non-vanishing asymmetries, which are comparable in magnitude to the asymmetries obtained for hadron production.…”

supporting

confidence: 61%

Azimuthal asymmetries in hadronic final states at HERA

Ahmed

Gehrmann

1999

Physics Letters B

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The distribution of hadrons produced in deeply inelastic electron-proton collisions depends on the azimuthal angle between lepton scattering plane and hadron production plane in the photon-proton centre-of-mass frame. In addition to the well known up-down asymmetry induced by the azimuthal dependence of the Born level subprocess, there is also a non-vanishing left-right asymmetry, provided the incoming electron is polarized. This asymmetry is time-reversal-odd and induced by absorptive corrections to the Born level process. We investigate the numerical magnitude of azimuthal asymmetries in semi-inclusive hadron production at HERA with particular emphasis on a possible determination of the time-reversal-odd asymmetry.

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supporting

confidence: 61%

Azimuthal asymmetries in hadronic final states at HERA

Ahmed

Gehrmann

1999

Physics Letters B

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“…The projections operating on Hp, are the result of the integration of the lepton tensor (see for example Ref. [92]) over the angles that describe the orientation of the momentum of the outgoing lepton with respect to the momenta of the outgoing hadrons. The cross section consists of two parts, proportional to Y M , the "metric" contribution, and proportional to YL, the longitudinal contribution 19).…”

Section: The Current Fragmentation Regionmentioning

confidence: 99%

Heavy-Quark Production in the Target Fragmentation Region

Graudenz¹

1997

Fortschr. Phys.

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Fixed-target experiments permit the study of hadron production in the target fragmentation region. It is expected that the tagging of specific particles in the target fragments can be employed to introduce a bias in the hard scattering process towards a specific flavour content. The case of hadrons containing a heavy quark is particularly attractive because of the clear experimental signatures and the applicability of perturbative QCD. The standard approach to one-particle inclusive processes based on fragmentation functions is valid in the current fragmentation region and for large transverse momenta $p_T$ in the target fragmentation region, but it fails for particle production at small $p_T$ in the target fragmentation region. A collinear singularity, which cannot be absorbed in the standard way into the phenomenological distribution functions, prohibits the application of this procedure. This situation is remedied by the introduction of a new set of distribution functions, the target fragmentation functions. They describe particle production in the target fragmentation region, and can be viewed as correlated distribution functions in the momentum fractions of the observed particle and of the parton initiating the hard scattering process. It is shown in a next-to-leading-order calculation for the case of deeply inelastic lepton-nucleon scattering that the additional singularity can be consistently absorbed into the renormalized target fragmentation functions on the one-loop level. The formalism is derived in detail and is applied to the production of heavy quarks. The renormalization group equation of the target fragmentation functions for the perturbative contribution is solved numerically, and the results of a case study for deeply inelastic lepton-nucleon scattering at DESY (H1 and ZEUS at HERA), at CERN (NA47) and at Fermilab (E665) are discussed. We also comment briefly on the case of an intrinsic heavy-quark content of the proton.Comment: Habilitationsschrift, Universitaet Hamburg, submitted in April 1996. 118 pages (LATEX); figures are included via epsfig; The AMSTEX fonts are required. See also http://wwwcn.cern.ch/~graudenz/publications.html for a complete (compressed) postscript fil

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“…Especially jet final states in deep inelastic scattering contain important information on the distribution of partons in the proton, which are a crucial ingredient for the prediction of any cross section at the LHC and at other future hadron colliders. Single jet inclusive and di-jet cross sections in deep inelastic scattering [3][4][5] are among the few precisely measured processes [6][7][8][9][10][11][12][13][14][15][16][17][18][19] that provide sensitivity to the strong coupling constant and the gluon distribution already at tree level. The importance of these cross sections for…”

Section: Introductionmentioning

confidence: 99%

NNLO QCD corrections to jet production in deep inelastic scattering

Currie

Gehrmann

Huss

et al. 2017

J. High Energ. Phys.

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Hadronic jets in deeply inelastic electron-proton collisions are produced by the scattering of a parton from the proton with the virtual gauge boson mediating the interaction. The HERA experiments have performed precision measurements of inclusive single jet production and di-jet production in the Breit frame, which provide important constraints on the strong coupling constant and on parton distributions in the proton. We describe the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to these processes, and assess their size and impact. A detailed comparison with data from the H1 and ZEUS experiments highlights that inclusive single jet production displays a better perturbative convergence than di-jet production. We also observe that the event selection cuts in some of the di-jet measurements of both H1 and ZEUS induce an infrared sensitivity that destabilises the perturbative stability of the predictions. Our results open up new opportunities for QCD precision studies with jet production observables in deep inelastic scattering.

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Jet cross sections in leptoproduction from QCD

Cited by 22 publications

References 31 publications

Azimuthal asymmetries in hadronic final states at HERA

Azimuthal asymmetries in hadronic final states at HERA

Heavy-Quark Production in the Target Fragmentation Region

NNLO QCD corrections to jet production in deep inelastic scattering

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