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  Search for QCD instanton-induced processes in deep-inelastic scattering at HERA

Adloff, C., Andreev, V., Andrieu, B., Anthonis, T., Astvatsatourov, A., Babaev, A., et al. (2002). Search for QCD instanton-induced processes in deep-inelastic scattering at HERA. European Physical Journal C, 25(4), 495-509.

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Adloff, C.1, Autor
Andreev, V.1, Autor
Andrieu, B.1, Autor
Anthonis, T.1, Autor
Astvatsatourov, A.1, Autor
Babaev, A.1, Autor
Bahr, J.1, Autor
Baranov, P.1, Autor
Barrelet, E.1, Autor
Bartel, W.1, Autor
Becker, J.1, Autor
Beckingham, M.1, Autor
Beglarian, A.1, Autor
Behnke, O.1, Autor
Beier, C.1, Autor
Belousov, A.1, Autor
Berger, C.1, Autor
Berndt, T.1, Autor
Bizot, J. C.1, Autor
Bohme, J.1, Autor
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Affiliations:
1Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, Wuppertal, Germany; Rhein Westfal TH Aachen, Inst Phys 1, Aachen, Germany; Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany; Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England; Univ Antwerp, Antwerp, Belgium; VUB, ULB, Inter Univ Inst High Energies, Brussels, Belgium; Rutherford Appleton Lab, Chilton, Didcot, England; Inst Nucl Phys, Krakow, Poland; Univ Dortmund, Inst Phys, D-4600 Dortmund, Germany; Joint Inst Nucl Res, Dubna, Russia; CEA, DSM, CE Saclay, DAPNIA, Gif Sur Yvette, France; DESY, D-2000 Hamburg, Germany; Univ Hamburg, Inst Expt Phys, Hamburg, Germany; Univ Heidelberg, Inst Phys, D-6900 Heidelberg, Germany; Univ Heidelberg, Kirchhoff Inst Phys, Heidelberg, Germany; Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany; Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia; Univ Lancaster, Sch Phys & Chem, Lancaster, England; Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England; Univ London Queen Mary & Westfield Coll, London E1 4NS, England; Lund Univ, Dept Phys, Lund, Sweden; Univ Manchester, Dept Phys, Manchester M13 9PL, Lancs, England; Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France; Inst Theoret & Expt Phys, Moscow 117259, Russia; PN Lebedev Phys Inst, Moscow, Russia; Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany; Univ Paris 11, IN2P3, CNRS, LAL, Orsay, France; Ecole Polytech, IN2P3, LPNHE, CNRS, Palaiseau, France; Univ Paris 06, IN2P3, CNRS, LPNHE, Paris, France; Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic; Charles Univ, Fac Math & Phys, Prague, Czech Republic; Paul Scherrer Inst, Villigen, Switzerland; Yerevan Phys Inst, Yerevan 375036, Armenia; DESY, Zeuthen, Germany; Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland; Univ Zurich, Inst Phys, Zurich, Switzerland; Natl Tech Univ Athens, Dept Phys, Athens 15773, Greece; Berg Univ Gesamthsch Wuppertal, Rechenzentrum, Wuppertal, Germany; Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany; CINVESTAV, Dept Fis Ap, Merida, Yucatan, Mexico; Safarik Univ, Kosice, Slovakia; CERN, Geneva, Switzerland; CINVESTAV, Dept Fis, Mexico City, DF, Mexico; Univ Roma Tre, Dipartimento Fis, Rome, Italy; INFN Roma 3, Rome, Italy; Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, Wuppertal, Germany; Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France, ou_persistent22              
2Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907545              

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 Zusammenfassung: Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in a kinematic region defined by the Bjorken-scaling variables x > 10(-3), 0.1 < y < 0.6 and photon virtualities 10 less than or similar to Q(2) < 100 GeV2. Several observables characterising hadronic final state properties of QCD instanton-induced events are exploited to identify a potentially instanton-enriched domain. While an excess of events with instanton-like topology is observed it cannot be claimed significant given the uncertainty of the standard DIS background simulation. Upper limits on the cross-section for instanton-induced processes of between 60 pb and 1000 pb are set dependent on the kinematic domain considered. The data do not exclude the cross-section predicted by instanton perturbation theory for small instanton sizes. At large instanton sizes a naive extrapolation of instanton perturbation theory yields a cross-section in the range of sensitivity of this study. Such a cross-section is not observed, in agreement with non-perturbative lattice simulations of the QCD vacuum.

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Sprache(n): eng - English
 Datum: 2002-11
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 31364
ISI: 000179928900001
 Art des Abschluß: -

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Titel: European Physical Journal C
  Alternativer Titel : Eur. Phys. J. C
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 25 (4) Artikelnummer: - Start- / Endseite: 495 - 509 Identifikator: ISSN: 1434-6044