Search for odderon-induced contributions to exclusive pi(0) photoproduction at HERA

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Abstract

A search for contributions to the reaction ep --> epi(0)N* from photon-odderon fusion in the photoproduction regime at HERA is reported, at an average photon-proton centre-of-mass energy <W> = 215 GeV. The measurement proceeds via detection of the pi(0) decay photons, a leading neutron from the N* decay, and the scattered electron. No pi(0) signal is observed and an upper limit on the cross section for the photon-odderon fusion process of sigma(gammap --> pi(0)N*) < 49 nb at the 95% confidence level is derived, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02 < < 0.3 GeV2. This excludes a recent prediction from a calculation based on a non-perturbative QCD model of a photon-odderon fusion cross section above 200 nb. (C) 2002 Elsevier Science B.V. All rights reserved.

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Authors
  • C Adloff
  • V Andreev
  • B Andrieu
  • T Anthonis
  • V Arkadov
  • A Astvatsatourov
  • A Babaev
  • J Bahr
  • P Baranov
  • E Barrelet
  • W Bartel
  • J Becker
  • A Beglarian
  • O Behnke
  • C Beier
  • A Belousov
  • C Berger
  • T Berndt
  • JC Bizot
  • J Bohme
  • V Boudry
  • W Braunschweig
  • V Brisson
  • HB Broker
  • DP Brown
  • W Bruckner
  • D Bruncko
  • J Burger
  • FW Busser
  • A Bunyatyan
  • A Burrage
  • G Buschhorn
  • L Bystritskaya
  • AJ Campbell
  • J Cao
  • S Caron
  • F Cassol-Brunner
  • D Clarke
  • C Collard
  • JG Contreras
  • YR Coppens
  • JA Coughlan
  • MC Cousinou
  • BE Cox
  • G Cozzika
  • J Cvach
  • JB Dainton
  • WD Dau
  • K Daum
  • Mattias Davidsson
  • B Delcourt
  • N Delerue
  • R Demirchyan
  • A De Roeck
  • EA De Wolf
  • C Diaconu
  • J Dingfelder
  • P Dixon
  • V Dodonov
  • JD Dowell
  • A Droutskoi
  • A Dubak
  • C Duprel
  • G Eckerlin
  • D Eckstein
  • V Efremenko
  • S Egli
  • R Eichler
  • F Eisele
  • E Eisenhandler
  • M Ellerbrock
  • E Elsen
  • A Erdmann
  • W Erdmann
  • PJW Faulkner
  • L Favart
  • A Fedotov
  • R Felst
  • J Ferencei
  • S Ferron
  • M Fleischer
  • YH Fleming
  • G Flugge
  • A Fomenko
  • I Foresti
  • J Formanek
  • G Franke
  • E Gabathuler
  • K Gabathuler
  • J Garvey
  • J Gassner
  • J Gayler
  • R Gerhards
  • C Gerlich
  • S Ghazaryan
  • L Goerlich
  • N Gogitidze
  • T Golling
  • C Grab
  • V Grabski
  • H Grassler
  • T Greenshaw
  • G Grindhammer
  • T Hadig
  • D Haidt
  • L Hajduk
  • J Haller
  • WJ Haynes
  • B Heinemann
  • G Heinzelmann
  • RCW Henderson
  • S Hengstmann
  • H Henschel
  • R Heremans
  • G Herrera
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  • M Hildebrandt
  • M Hilgers
  • KH Hiller
  • J Hladky
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  • R Horisberger
  • A Hovhannisyan
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  • C Issever
  • M Jacquet
  • M Jaffre
  • L Janauschek
  • X Janssen
  • V Jemanov
  • C Johnson
  • DP Johnson
  • MAS Jones
  • Hannes Jung
  • D Kant
  • M Kapichine
  • Martin Karlsson
  • O Karschnick
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  • N Keller
  • J Kennedy
  • IR Kenyon
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  • C Kiesling
  • Pär Kjellberg
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  • G Knies
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  • V Korbel
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  • A Koutov
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  • J Kroseberg
  • K Kruger
  • A Kupper
  • T Kuhr
  • T Kurca
  • D Lamb
  • MPJ Landon
  • W Lange
  • T Lastovicka
  • P Laycock
  • E Lebailly
  • A Lebedev
  • B Leissner
  • R Lemrani
  • V Lendermann
  • S Levonian
  • Magnus Lindström
  • B List
  • E Lobodzinska
  • B Lobodzinski
  • A Loginov
  • N Loktionova
  • V Lubimov
  • S Luders
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  • JP Phillips
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  • G Radel
  • J Rauschenberger
  • P Reimer
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  • C Risler
  • E Rizvi
  • P Robmann
  • R Roosen
  • A Rostovtsev
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  • S Schatzel
  • J Scheins
  • FP Schilling
  • P Schleper
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  • D Schmidt
  • S Schmidt
  • S Schmitt
  • M Schneider
  • L Schoeffel
  • A Schooning
  • T Schorner
  • V Schroder
  • HC Schultz-Coulon
  • C Schwanenberger
  • K Sedlak
  • F Sefkow
  • V Shekelyan
  • I Sheviakov
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  • Y Sirois
  • T Sloan
  • P Smirnov
  • Y Soloviev
  • D South
  • V Spaskov
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  • B Stella
  • J Stiewe
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  • PD Thompson
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  • S Udluft
  • M Urban
  • A Usik
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  • A Valkarova
  • C Vallee
  • P Van Mechelen
  • S Vassiliev
  • Y Vazdik
  • A Vichnevski
  • M Vorobiev
  • K Wacker
  • J Wagner
  • R Wallny
  • B Waugh
  • G Weber
  • M Weber
  • D Wegener
  • C Werner
  • M Werner
  • N Werner
  • M Wessels
  • G White
  • S Wiesand
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  • M Winde
  • GG Winter
  • C Wissing
  • M Wobisch
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  • E Wunsch
  • AC Wyatt
  • J Zacek
  • J Zalesak
  • Z Zhang
  • A Zhokin
  • F Zomer
  • M zur Nedden
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)35-43
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume544
Issue number1-2
Publication statusPublished - 2002
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Particle Physics (011013002), Chemical Physics (S) (011001060)