Advanced

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

Adloff, C; Andreev, V; Andrieu, B; Anthonis, T; Astvatsatourov, A; Babaev, A; Bahr, J; Baranov, P; Barrelet, E and Bartel, W, et al. (2002) In European Physical Journal C. Particles and Fields 25(4). p.495-509
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
25
issue
4
pages
495 - 509
publisher
Springer
external identifiers
  • wos:000179928900001
  • scopus:0036878195
ISSN
1434-6044
DOI
10.1140/epjc/s2002-01039-8
language
English
LU publication?
yes
id
076a4ee5-6ef9-4107-a7ea-518085664dda (old id 320726)
date added to LUP
2007-08-06 10:28:14
date last changed
2017-10-22 04:35:03
@article{076a4ee5-6ef9-4107-a7ea-518085664dda,
  abstract     = {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 &gt; 10(-3), 0.1 &lt; y &lt; 0.6 and photon virtualities 10 less than or similar to Q(2) &lt; 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.},
  author       = {Adloff, C and Andreev, V and Andrieu, B and Anthonis, T and Astvatsatourov, A and Babaev, A and Bahr, J and Baranov, P and Barrelet, E and Bartel, W and Becker, J and Beckingham, M and Beglarian, A and Behnke, O and Beier, C and Belousov, A and Berger, C and Berndt, T and Bizot, JC and Bohme, J and Boudry, V and Braunschweig, W and Brisson, V and Broker, HB and Brown, DP and Bruncko, D and Busser, FW and Bunyatyan, A and Burrage, A and Buschhorn, G and Bystritskaya, L and Campbell, AJ and Carli, T and Caron, S and Cassol-Brunner, F and Clarke, D and Collard, C and Contreras, JG and Coppens, YR and Coughlan, JA and Cousinou, MC and Cox, BE and Cozzika, G and Cvach, J and Dainton, JB and Dau, WD and Daum, K and Davidsson, Mattias and Delcourt, B and Delerue, N and Demirchyan, R and De Roeck, A and De Wolf, EA and Diaconu, C and Dingfelder, J and Dixon, P and Dodonov, V and Dowell, JD and Droutskoi, A and Dubak, A and Duprel, C and Eckerlin, G and Eckstein, D and Efremenko, V and Egli, S and Eichler, R and Eisele, F and Eisenhandler, E and Ellerbrock, M and Elsen, E and Erdmann, M and Erdmann, W and Faulkner, PJW and Favart, L and Fedotov, A and Felst, R and Ferencei, J and Ferron, S and Fleischer, M and Fleischmann, P and Fleming, YH and Flugge, G and Fomenko, A and Foresti, I and Formanek, J and Franke, G and Frising, G and Gabathuler, E and Gabathuler, K and Garvey, J and Gassner, J and Gayler, J and Gerhards, R and Gerlich, C and Ghazaryan, S and Goerlich, L and Gogitidze, N and Grab, C and Grabski, V and Grassler, H and Greenshaw, T and Grindhammer, G and Hadig, T and Haidt, D and Hajduk, L and Haller, L and Haynes, WJ and Heinemann, B and Heinzelmann, G and Henderson, RCW and Hengstmann, S and Henschel, H and Heremans, R and Herrera, G and Herynek, I and Hildebrandt, M and Hilgers, M and Hiller, KH and Hladky, J and Hoting, P and Hoffmann, D and Horisberger, R and Hovhannisyan, A and Hurling, S and Ibbotson, M and Issever, C and Jacquet, M and Jaffre, M and Janauschek, L and Janssen, X and Jemanov, V and Jönsson, Leif and Johnson, C and Johnson, DP and Jones, MAS and Jung, Hannes and Kant, D and Kapichine, M and Karlsson, Martin and Karschnick, O and Keil, F and Keller, N and Kennedy, J and Kenyon, IR and Kermiche, S and Kiesling, C and Kjellberg, Pär and Klein, M and Kleinwort, C and Kluge, T and Knies, G and Koblitz, B and Kolya, SD and Korbel, V and Kostka, P and Kotelnikov, SK and Koutouev, R and Lastovicka, T and Laycock, P and Lebailly, E and Lebedev, A and Leissner, B and Lemrani, R and Lendermann, V and Levonian, S and Lindström, Magnus and List, B and Lobodzinska, E and Lobodzinski, B and Loginov, A and Loktionova, N and Lubimov, V and Luders, S and Luke, D and Lytkin, L and Malden, N and Malinovski, E and Malinovski, I and Mangano, S and Maracek, R and Marage, P and Marks, J and Marshall, R and Martyn, HU and Martyniak, J and Maxfield, SJ and Meer, D and Mehta, A and Meier, K and Meyer, AB and Meyer, H and Meyer, J and Meyer, PO and Mikocki, S and Milstead, D and Mohrdieck, S and Mondragon, MN and Moreau, F and Morozov, A and Morris, JV and Muller, K and Murin, P and Nagovizin, V and Naroska, B and Naumann, J and Naumann, T and Nellen, G and Newman, PR and Niebergall, F and Niebuhr, C and Nix, O and Nowak, G and Olsson, JE and Ozerov, D and Panassik, V and Pascaud, C and Patel, GD and Peez, M and Perez, E and Petrukhin, A and Phillips, JP and Pitzl, D and Poschl, R and Potachnikova, I and Povh, B and Radel, G and Rauschenberger, J and Reimer, P and Reisert, B and Reyna, D and Risler, C and Rizvi, E and Robmann, P and Roosen, R and Rostovtsev, A and Rusakov, S and Rybicki, K and Sankey, DPC and Schatzel, S and Scheins, J and Schilling, FP and Schleper, P and Schmidt, D and Schmidt, D and Schmidt, S and Schmidt, S and Schneider, M and Schoeffel, L and Schoning, A and Schorner, T and Schroder, V and Schultz-Coulon, HC and Schwanenberger, C and Sedlak, K and Sefkow, F and Shekelyan, V and Sheviakov, I and Shtarkov, LN and Sirois, Y and Sloan, T and Smirnov, P and Soloviev, Y and South, D and Spaskov, V and Specka, A and Spitzer, H and Stamen, R and Stella, B and Stiewe, J and Strauch, I and Straumann, U and Swart, M and Tchetchelnitski, S and Thompson, G and Thompson, PD and Tobien, N and Tomasz, F and Traynor, D and Truol, P and Tsipolitis, G and Tsurin, I and Turnau, J and Turney, JE and Tzamariudaki, E and Udluft, S and Uraev, A and Urban, M and Usik, A and Valkar, S and Valkarova, A and Vallee, C and Van Mechelen, P and Vassiliev, S and Vazdik, Y and Vest, A and Vichnevski, A and Wacker, K and Wagner, J and Wallny, R and Waugh, B and Weber, G and Wegener, D and Werner, C and Werner, N and Wessels, M and White, G and Wiesand, S and Wilksen, T and Winde, M and Winter, GG and Wissing, C and Wobisch, M and Woehrling, EE and Wunsch, E and Wyatt, AC and Zacek, J and Zalesak, J and Zhang, Z and Zhokin, A and Zomer, F and zur Nedden, M},
  issn         = {1434-6044},
  language     = {eng},
  number       = {4},
  pages        = {495--509},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Search for QCD instanton-induced processes in deep-inelastic scattering at HERA},
  url          = {http://dx.doi.org/10.1140/epjc/s2002-01039-8},
  volume       = {25},
  year         = {2002},
}