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Title: Forward-jet production in deep inelastic ep scattering at HERA.

Abstract

Forward jet cross sections have been measured in neutral current deep inelastic scattering at low Bjorken-x with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb{sup -1}. Measurements are presented for inclusive forward jets as well as for forward jets accompanied by a dijet system. The explored phase space, with jet pseudorapidity up to 4.3 is expected to be particularly sensitive to the dynamics of QCD parton evolution at low x. The measurements are compared to fixed-order QCD calculations and to leading-order parton-shower Monte Carlo models.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
962075
Report Number(s):
ANL-HEP-PR-09-48
TRN: US200919%%376
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Eur. J. Phys. C; Journal Volume: 52; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CROSS SECTIONS; DEEP INELASTIC SCATTERING; LUMINOSITY; NEUTRAL CURRENTS; PHASE SPACE; PRODUCTION; QUANTUM CHROMODYNAMICS; SCATTERING

Citation Formats

Chekanov, S., Derrick, M., Magill, S., Musgrave, B., Repond, J., Yoshida, R., High Energy Physics, and Zeus Collaboration. Forward-jet production in deep inelastic ep scattering at HERA.. United States: N. p., 2007. Web. doi:10.1140/epjc/s10052-007-0418-0.
Chekanov, S., Derrick, M., Magill, S., Musgrave, B., Repond, J., Yoshida, R., High Energy Physics, & Zeus Collaboration. Forward-jet production in deep inelastic ep scattering at HERA.. United States. doi:10.1140/epjc/s10052-007-0418-0.
Chekanov, S., Derrick, M., Magill, S., Musgrave, B., Repond, J., Yoshida, R., High Energy Physics, and Zeus Collaboration. Mon . "Forward-jet production in deep inelastic ep scattering at HERA.". United States. doi:10.1140/epjc/s10052-007-0418-0.
@article{osti_962075,
title = {Forward-jet production in deep inelastic ep scattering at HERA.},
author = {Chekanov, S. and Derrick, M. and Magill, S. and Musgrave, B. and Repond, J. and Yoshida, R. and High Energy Physics and Zeus Collaboration},
abstractNote = {Forward jet cross sections have been measured in neutral current deep inelastic scattering at low Bjorken-x with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb{sup -1}. Measurements are presented for inclusive forward jets as well as for forward jets accompanied by a dijet system. The explored phase space, with jet pseudorapidity up to 4.3 is expected to be particularly sensitive to the dynamics of QCD parton evolution at low x. The measurements are compared to fixed-order QCD calculations and to leading-order parton-shower Monte Carlo models.},
doi = {10.1140/epjc/s10052-007-0418-0},
journal = {Eur. J. Phys. C},
number = 2007,
volume = 52,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Three-jet production in the reaction ep to eXp has been studied with the ZEUS detector at HERA using an integrated luminosity of 42.74 pb/sup -1/. The data were measured in the kinematic region 5 lt Q/sup 2/ lt 100 GeV/sup 2/, 200 lt W lt 250 GeV and 23 lt M/sub X/ lt 40 GeV. The diffractive signal was selected by requiring a large rapidity gap in the outgoing proton direction. Jets were reconstructed in the centre-of-mass system of X using the exclusive k/sub T/-algorithm. A sample of three-jet events in diffraction has been identified. Differential cross sections were measuredmore » as a function of the jet pseudorapidity and jet transverse momentum with respect to the virtual photon-pomeron axis. The jets going in the pomeron direction are broader than those going in the virtual-photon direction. This is consistent with models predicting that gluons are predominantly produced in the pomeron direction and quarks in the virtual-photon direction.« less
  • A number of the most recent results from the wealth of precision HERA data on high transverse energy jet production in deep inelastic scattering are reviewed. These measurements are confronted with predictions from next-to-leading order (NLO) Quantum Chromodynamics and allow the extraction of the strong coupling constant, {alpha}s, and have been used in QCD fits of the parton distribution functions in the proton.
  • The study of energy flow in high energy particle collisions is a powerful tool for testing QCD predictions. Event shape variables extend this study to the non-perturbative region of QCD.
  • The focus of this report are the recent measurements of the cross section and proton structure function F2 in ep deep inelastic scattering (DIS) at low virtuality of the exchanged boson, Q2, with the H1 detector at the HERA accelerator in Hamburg. The region of low Q2 and low Bjorken x allows precision tests of perturbative QCD at high gluon densities to be performed and also the transition from the perturbative to non-perturbative QCD domains to be explored. The recent H1 measurements of charm and beauty cross sections and structure functions, F{sub 2}{sup cc-bar} ans F{sub 2}{sup bb-bar}, for photonmore » virtuality 12 < Q2 < 60 GeV2 will also be discussed.« less
  • No abstract prepared.