Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration

C. Adloff; V. Andreev; B. Andrieu; T. Anthonis; A. Astvatsatourov; A. Babaev; J. Bähr; P. Baranov; E. Barrelet; W. Bartel; J. Becker; M. Beckingham; A. Beglarian; O. Behnke; C. Beier; A. Belousov; Ch Berger; T. Berndt; J. C. Bizot; J. Böhme; V. Boudry; W. Braunschweig; V. Brisson; H. B. Bröker; D. P. Brown; W. Bruckner; D. Bruncko; F. W. Büsser; A. Bunyatyan; A. Burrage; G. Buschhorn; L. Bystritskaya; A. J. Campbell; T. Carli; S. Caron; F. Cassol-Brunner; D. Clarke; C. Collard; J. G. Contreras; Y. R. Coppens; J. A. Coughlan; M. C. Cousinou; B. E. Cox; G. Cozzika; J. Cvach; J. B. Dainton; W. D. Dau; K. Daum; M. Davidsson; B. Delcourt; N. Delerue; R. Demirchyan; A. de Roeck; E. A. de Wolf; C. Diaconu; J. Dingfelder; P. Dixon; V. Dodonov; J. D. 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; M. Erdmann; W. Erdmann; P. J W Faulkner; L. Favart; A. Fedotov; R. Felst; J. Ferencei; S. Ferron; M. Fleischer; P. Fleischmann; Y. H. Fleming; G. Flügge; A. Fomenko; I. Foresti; J. Formánek; G. Franke; G. Frising; E. Gabathuler; K. Gabathuler; J. Garvey; J. Gassner; J. Gayler; R. Gerhards; C. Gerlich; S. Ghazaryan; L. Goerlich; N. Gogitidze; C. Grab; V. Grabski; H. Grässler; T. Greenshaw; G. Grindhammer; T. Hadig; D. Haidt; L. Hajduk; J. Haller; W. J. Haynes; B. Heinemann; G. Heinzelmann; R. C W Henderson; S. Hengstmann; H. Henschel; R. Heremans; G. Herrera; I. Herynek; M. Hildebrandt; M. Hilgers; K. H. Hiller; J. Hladký; P. Höting; D. Hoffmann; R. Horisberger; A. Hovhannisyan; S. Hurling; M. Ibbotson; C. Işsever; M. Jacquet; M. Jaffre; L. Janauschek; X. Janssen; V. Jemanov; L. Jönsson; C. Johnson; D. P. Johnson; M. A S Jones; H. Jung; D. Kant; M. Kapichine; M. Karlsson; O. Karschnick; F. Keil; N. Keller; J. Kennedy; I. R. Kenyon; S. Kermiche; C. Kiesling; P. Kjellberg; M. Klein; C. Kleinwort; T. Kluge; G. Knies; B. Koblitz; S. D. Kolya; V. Korbel; P. Kostka; S. K. Kotelnikov; R. Koutouev; A. Koutov; J. Kroseberg; K. Krüger; T. Kuhr; T. Kurča; D. Lamb; M. P J Landon; W. Lange; T. Laštovička; P. Laycock; E. Lebailly; A. Lebedev; B. Leißner; R. Lemrani; V. Lendermann; S. Levonian; M. Lindstroem; B. List; E. Lobodzinska; B. Lobodzinski; A. Loginov; N. Loktionova; V. Lubimov; S. Lüders; D. Lüke; L. Lytkin; N. Malden; E. Malinovski; I. Malinovski; S. Mangano; R. Maraček; P. Marage; J. Marks; R. Marshall; H. U. Martyn; J. Martyniak; S. J. Maxfield; D. Meer; A. Mehta; K. Meier; A. B. Meyer; H. Meyer; J. Meyer; P. O. Meyer; S. Mikocki; D. Milstead; S. Mohrdieck; M. N. Mondragon; F. Moreau; A. Morozov; J. V. Morris; K. Müller; P. Murín; V. Nagovizin; B. Naroska; J. Naumann; Th Naumann; G. Nellen; P. R. Newman; F. Niebergall; C. Niebuhr; O. Nix; G. Nowak; J. E. Olsson; D. Ozerov; V. Panassik; C. Pascaud; G. D. Patel; M. Peez; E. Perez; A. Petrukhin; J. P. Phillips; D. Pitzl; R. Pöschl; I. Potachnikova; B. Povh; G. Rädel; J. Rauschenberger; P. Reimer; B. Reisert; D. Reyna; C. Risler; E. Rizvi; P. Robmann; R. Roosen; A. Rostovtsev; S. Rusakov; K. Rybicki; D. P C Sankey; S. Schätzel; J. Scheins; F. P. Schilling; P. Schleper; D. Schmidt; S. Schmidt; S. Schmitt; M. Schneider; L. Schoeffel; A. Schöning; T. Schörner; V. Schröder; H. C. Schultz-Coulon; C. Schwanenberger; K. Sedlák; F. Sefkow; V. Shekelyan; I. Sheviakov; L. N. Shtarkov; Y. Sirois; T. Sloan; P. Smirnov; Y. Soloviev; D. South; V. Spaskov; A. Specka; H. Spitzer; R. Stamen; B. Stella; J. Stiewe; I. Strauch; U. Straumann; M. Swart; S. Tchetchelnitski; G. Thompson; P. D. Thompson; N. Tobien; F. Tomasz; D. Traynor; P. Truöl; G. Tsipolitis; I. Tsurin; J. Turnau; J. E. Turney; E. Tzamariudaki; S. Udluft; A. Uraev; M. Urban; A. Usik; S. Valkár; A. Valkárová; C. Vallée; P. van Mechelen; S. Vassiliev; Y. Vazdik; A. Vest; A. Vichnevski; K. Wacker; J. Wagner; R. Wallny; B. Waugh; G. Weber; D. Wegener; C. Werner; N. Werner; M. Wessels; G. White; S. Wiesand; T. Wilksen; M. Winde; G. G. Winter; Ch Wissing; M. Wobisch; E. E. Woehrling; E. Wünsch; A. C. Wyatt; J. Žáček; J. Zálešák; Z. Zhang; A. Zhokin; F. Zomer; M. Zur Nedden

doi:10.1140/epjc/s2002-01039-8

Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration

C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, J. Becker, M. Beckingham, A. Beglarian, O. Behnke, C. Beier, A. Belousov, Ch Berger, T. Berndt, J. C. Bizot, J. BöhmeV. Boudry, W. Braunschweig, V. Brisson, H. B. Bröker, D. P. Brown, W. Bruckner, D. Bruncko, F. W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A. J. Campbell, T. Carli, S. Caron, F. Cassol-Brunner, D. Clarke, C. Collard, J. G. Contreras, Y. R. Coppens, J. A. Coughlan, M. C. Cousinou, B. E. Cox, G. Cozzika, J. Cvach, J. B. Dainton, W. D. Dau, K. Daum, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. de Roeck, E. A. de Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J. D. 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, M. Erdmann, W. Erdmann, P. J W Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, P. Fleischmann, Y. H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, C. Grab, V. Grabski, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, W. J. Haynes, B. Heinemann, G. Heinzelmann, R. C W Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K. H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, S. Hurling, M. Ibbotson, C. Işsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D. P. Johnson, M. A S Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I. R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, R. Koutouev, A. Koutov, J. Kroseberg, K. Krüger, T. Kuhr, T. Kurča, D. Lamb, M. P J Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, N. Malden, E. Malinovski, I. Malinovski, S. Mangano, R. Maraček, P. Marage, J. Marks, R. Marshall, H. U. Martyn, J. Martyniak, S. J. Maxfield, D. Meer, A. Mehta, K. Meier, A. B. Meyer, H. Meyer, J. Meyer, P. O. Meyer, S. Mikocki, D. Milstead, S. Mohrdieck, M. N. Mondragon, F. Moreau, A. Morozov, J. V. Morris, K. Müller, P. Murín, V. Nagovizin, B. Naroska, J. Naumann, Th Naumann, G. Nellen, P. R. Newman, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J. E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G. D. Patel, M. Peez, E. Perez, A. Petrukhin, J. P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D. P C Sankey, S. Schätzel, J. Scheins, F. P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H. C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, I. Sheviakov, L. N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, M. Swart, S. Tchetchelnitski, G. Thompson, P. D. Thompson, N. Tobien, F. Tomasz, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J. E. Turney, E. Tzamariudaki, S. Udluft, A. Uraev, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. van Mechelen, S. Vassiliev, Y. Vazdik, A. Vest, A. Vichnevski, K. Wacker, J. Wagner, R. Wallny, B. Waugh, G. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, G. White, S. Wiesand, T. Wilksen, M. Winde, G. G. Winter, Ch Wissing, M. Wobisch, E. E. Woehrling, E. Wünsch, A. C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. Zur Nedden

Research output: Contribution to journal › Article › peer-review

Abstract

Signals of QCD instanton-induced processes are searched for in deep-inelástic 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 ≲ Q2 <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.

Original language	English
Pages (from-to)	495-509
Number of pages	14
Journal	European Physical Journal C
Volume	25
Issue number	4
DOIs	https://doi.org/10.1140/epjc/s2002-01039-8
Publication status	Published - Nov 2002

Keywords

High Energy Physics - Experiment

Access to Document

10.1140/epjc/s2002-01039-8

http://arxiv.org/abs/hep-ex/0205078

Cite this

Adloff, C., Andreev, V., Andrieu, B., Anthonis, T., Astvatsatourov, A., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Becker, J., Beckingham, M., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Berger, C., Berndt, T., Bizot, J. C., ... Zur Nedden, M. (2002). Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration. European Physical Journal C, 25(4), 495-509. https://doi.org/10.1140/epjc/s2002-01039-8

@article{825b18ef3e1e40b6a363a7a5cb4fa8f6,

title = "Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration",

abstract = "Signals of QCD instanton-induced processes are searched for in deep-inel{\'a}stic 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 ≲ Q2 <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.",

keywords = "High Energy Physics - Experiment",

author = "C. Adloff and V. Andreev and B. Andrieu and T. Anthonis and A. Astvatsatourov and A. Babaev and J. B{\"a}hr and P. Baranov and E. Barrelet and W. Bartel and J. Becker and M. Beckingham and A. Beglarian and O. Behnke and C. Beier and A. Belousov and Ch Berger and T. Berndt and Bizot, {J. C.} and J. B{\"o}hme and V. Boudry and W. Braunschweig and V. Brisson and Br{\"o}ker, {H. B.} and Brown, {D. P.} and W. Bruckner and D. Bruncko and B{\"u}sser, {F. W.} and A. Bunyatyan and A. Burrage and G. Buschhorn and L. Bystritskaya and Campbell, {A. J.} and T. Carli and S. Caron and F. Cassol-Brunner and D. Clarke and C. Collard and Contreras, {J. G.} and Coppens, {Y. R.} and Coughlan, {J. A.} and Cousinou, {M. C.} and Cox, {B. E.} and G. Cozzika and J. Cvach and Dainton, {J. B.} and Dau, {W. D.} and K. Daum and M. Davidsson and B. Delcourt and N. Delerue and R. Demirchyan and {de Roeck}, A. and {de Wolf}, {E. A.} and C. Diaconu and J. Dingfelder and P. Dixon and V. Dodonov and Dowell, {J. D.} and A. Droutskoi and A. Dubak and C. Duprel and G. Eckerlin and D. Eckstein and V. Efremenko and S. Egli and R. Eichler and F. Eisele and E. Eisenhandler and M. Ellerbrock and E. Elsen and M. Erdmann and W. Erdmann and Faulkner, {P. J W} and L. Favart and A. Fedotov and R. Felst and J. Ferencei and S. Ferron and M. Fleischer and P. Fleischmann and Fleming, {Y. H.} and G. Fl{\"u}gge and A. Fomenko and I. Foresti and J. Form{\'a}nek and G. Franke and G. Frising and E. Gabathuler and K. Gabathuler and J. Garvey and J. Gassner and J. Gayler and R. Gerhards and C. Gerlich and S. Ghazaryan and L. Goerlich and N. Gogitidze and C. Grab and V. Grabski and H. Gr{\"a}ssler and T. Greenshaw and G. Grindhammer and T. Hadig and D. Haidt and L. Hajduk and J. Haller and Haynes, {W. J.} and B. Heinemann and G. Heinzelmann and Henderson, {R. C W} and S. Hengstmann and H. Henschel and R. Heremans and G. Herrera and I. Herynek and M. Hildebrandt and M. Hilgers and Hiller, {K. H.} and J. Hladk{\'y} and P. H{\"o}ting and D. Hoffmann and R. Horisberger and A. Hovhannisyan and S. Hurling and M. Ibbotson and C. I{\c s}sever and M. Jacquet and M. Jaffre and L. Janauschek and X. Janssen and V. Jemanov and L. J{\"o}nsson and C. Johnson and Johnson, {D. P.} and Jones, {M. A S} and H. Jung and D. Kant and M. Kapichine and M. Karlsson and O. Karschnick and F. Keil and N. Keller and J. Kennedy and Kenyon, {I. R.} and S. Kermiche and C. Kiesling and P. Kjellberg and M. Klein and C. Kleinwort and T. Kluge and G. Knies and B. Koblitz and Kolya, {S. D.} and V. Korbel and P. Kostka and Kotelnikov, {S. K.} and R. Koutouev and A. Koutov and J. Kroseberg and K. Kr{\"u}ger and T. Kuhr and T. Kur{\v c}a and D. Lamb and Landon, {M. P J} and W. Lange and T. La{\v s}tovi{\v c}ka and P. Laycock and E. Lebailly and A. Lebedev and B. Lei{\ss}ner and R. Lemrani and V. Lendermann and S. Levonian and M. Lindstroem and B. List and E. Lobodzinska and B. Lobodzinski and A. Loginov and N. Loktionova and V. Lubimov and S. L{\"u}ders and D. L{\"u}ke and L. Lytkin and N. Malden and E. Malinovski and I. Malinovski and S. Mangano and R. Mara{\v c}ek and P. Marage and J. Marks and R. Marshall and Martyn, {H. U.} and J. Martyniak and Maxfield, {S. J.} and D. Meer and A. Mehta and K. Meier and Meyer, {A. B.} and H. Meyer and J. Meyer and Meyer, {P. O.} and S. Mikocki and D. Milstead and S. Mohrdieck and Mondragon, {M. N.} and F. Moreau and A. Morozov and Morris, {J. V.} and K. M{\"u}ller and P. Mur{\'i}n and V. Nagovizin and B. Naroska and J. Naumann and Th Naumann and G. Nellen and Newman, {P. R.} and F. Niebergall and C. Niebuhr and O. Nix and G. Nowak and Olsson, {J. E.} and D. Ozerov and V. Panassik and C. Pascaud and Patel, {G. D.} and M. Peez and E. Perez and A. Petrukhin and Phillips, {J. P.} and D. Pitzl and R. P{\"o}schl and I. Potachnikova and B. Povh and G. R{\"a}del and J. Rauschenberger and P. Reimer and B. Reisert and D. Reyna and C. Risler and E. Rizvi and P. Robmann and R. Roosen and A. Rostovtsev and S. Rusakov and K. Rybicki and Sankey, {D. P C} and S. Sch{\"a}tzel and J. Scheins and Schilling, {F. P.} and P. Schleper and D. Schmidt and S. Schmidt and S. Schmitt and M. Schneider and L. Schoeffel and A. Sch{\"o}ning and T. Sch{\"o}rner and V. Schr{\"o}der and Schultz-Coulon, {H. C.} and C. Schwanenberger and K. Sedl{\'a}k and F. Sefkow and V. Shekelyan and I. Sheviakov and Shtarkov, {L. N.} and Y. Sirois and T. Sloan and P. Smirnov and Y. Soloviev and D. South and V. Spaskov and A. Specka and H. Spitzer and R. Stamen and B. Stella and J. Stiewe and I. Strauch and U. Straumann and M. Swart and S. Tchetchelnitski and G. Thompson and Thompson, {P. D.} and N. Tobien and F. Tomasz and D. Traynor and P. Tru{\"o}l and G. Tsipolitis and I. Tsurin and J. Turnau and Turney, {J. E.} and E. Tzamariudaki and S. Udluft and A. Uraev and M. Urban and A. Usik and S. Valk{\'a}r and A. Valk{\'a}rov{\'a} and C. Vall{\'e}e and {van Mechelen}, P. and S. Vassiliev and Y. Vazdik and A. Vest and A. Vichnevski and K. Wacker and J. Wagner and R. Wallny and B. Waugh and G. Weber and D. Wegener and C. Werner and N. Werner and M. Wessels and G. White and S. Wiesand and T. Wilksen and M. Winde and Winter, {G. G.} and Ch Wissing and M. Wobisch and Woehrling, {E. E.} and E. W{\"u}nsch and Wyatt, {A. C.} and J. {\v Z}{\'a}{\v c}ek and J. Z{\'a}le{\v s}{\'a}k and Z. Zhang and A. Zhokin and F. Zomer and {Zur Nedden}, M.",

note = "{Eur.Phys.J.C25:495-509},2002",

year = "2002",

month = nov,

doi = "10.1140/epjc/s2002-01039-8",

language = "English",

volume = "25",

pages = "495--509",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "4",

}

Adloff, C, Andreev, V, Andrieu, B, Anthonis, T, Astvatsatourov, A, Babaev, A, Bähr, J, Baranov, P, Barrelet, E, Bartel, W, Becker, J, Beckingham, M, Beglarian, A, Behnke, O, Beier, C, Belousov, A, Berger, C, Berndt, T, Bizot, JC, Böhme, J, Boudry, V, Braunschweig, W, Brisson, V, Bröker, HB, Brown, DP, Bruckner, W, Bruncko, D, Büsser, FW, Bunyatyan, A, Burrage, A, Buschhorn, G, Bystritskaya, L, Campbell, AJ, Carli, T, Caron, S, Cassol-Brunner, F, Clarke, D, Collard, C, Contreras, JG, Coppens, YR, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cvach, J, Dainton, JB, Dau, WD, Daum, K, Davidsson, M, Delcourt, B, Delerue, N, Demirchyan, R, de Roeck, A, de Wolf, EA, Diaconu, C, Dingfelder, J, Dixon, P, Dodonov, V, Dowell, JD, Droutskoi, A, Dubak, A, Duprel, C, Eckerlin, G, Eckstein, D, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Ellerbrock, M, Elsen, E, Erdmann, M, Erdmann, W, Faulkner, PJW, Favart, L, Fedotov, A, Felst, R, Ferencei, J, Ferron, S, Fleischer, M, Fleischmann, P, Fleming, YH, Flügge, G, Fomenko, A, Foresti, I, Formánek, J, Franke, G, Frising, G, Gabathuler, E, Gabathuler, K, Garvey, J, Gassner, J, Gayler, J, Gerhards, R, Gerlich, C, Ghazaryan, S, Goerlich, L, Gogitidze, N, Grab, C, Grabski, V, Grässler, H, Greenshaw, T, Grindhammer, G, Hadig, T, Haidt, D, Hajduk, L, Haller, J, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herrera, G, Herynek, I, Hildebrandt, M, Hilgers, M, Hiller, KH, Hladký, J, Höting, P, Hoffmann, D, Horisberger, R, Hovhannisyan, A, Hurling, S, Ibbotson, M, Işsever, C, Jacquet, M, Jaffre, M, Janauschek, L, Janssen, X, Jemanov, V, Jönsson, L, Johnson, C, Johnson, DP, Jones, MAS, Jung, H, Kant, D, Kapichine, M, Karlsson, M, Karschnick, O, Keil, F, Keller, N, Kennedy, J, Kenyon, IR, Kermiche, S, Kiesling, C, Kjellberg, P, Klein, M, Kleinwort, C, Kluge, T, Knies, G, Koblitz, B, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Koutouev, R, Koutov, A, Kroseberg, J, Krüger, K, Kuhr, T, Kurča, T, Lamb, D, Landon, MPJ, Lange, W, Laštovička, T, Laycock, P, Lebailly, E, Lebedev, A, Leißner, B, Lemrani, R, Lendermann, V, Levonian, S, Lindstroem, M, List, B, Lobodzinska, E, Lobodzinski, B, Loginov, A, Loktionova, N, Lubimov, V, Lüders, S, Lüke, D, Lytkin, L, Malden, N, Malinovski, E, Malinovski, I, Mangano, S, Maraček, R, Marage, P, Marks, J, Marshall, R, Martyn, HU, Martyniak, J, Maxfield, SJ, Meer, D, Mehta, A, Meier, K, Meyer, AB, Meyer, H, Meyer, J, Meyer, PO, Mikocki, S, Milstead, D, Mohrdieck, S, Mondragon, MN, Moreau, F, Morozov, A, Morris, JV, Müller, K, Murín, P, Nagovizin, V, Naroska, B, Naumann, J, Naumann, T, Nellen, G, Newman, PR, Niebergall, F, Niebuhr, C, Nix, O, Nowak, G, Olsson, JE, Ozerov, D, Panassik, V, Pascaud, C, Patel, GD, Peez, M, Perez, E, Petrukhin, A, Phillips, JP, Pitzl, D, Pöschl, R, Potachnikova, I, Povh, B, Rädel, G, Rauschenberger, J, Reimer, P, Reisert, B, Reyna, D, Risler, C, Rizvi, E, Robmann, P, Roosen, R, Rostovtsev, A, Rusakov, S, Rybicki, K, Sankey, DPC, Schätzel, S, Scheins, J, Schilling, FP, Schleper, P, Schmidt, D, Schmidt, S, Schmitt, S, Schneider, M, Schoeffel, L, Schöning, A, Schörner, T, Schröder, V, Schultz-Coulon, HC, Schwanenberger, C, Sedlák, K, Sefkow, F, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Sirois, Y, Sloan, T, Smirnov, P, Soloviev, Y, South, D, Spaskov, V, Specka, A, Spitzer, H, Stamen, R, Stella, B, Stiewe, J, Strauch, I, Straumann, U, Swart, M, Tchetchelnitski, S, Thompson, G, Thompson, PD, Tobien, N, Tomasz, F, Traynor, D, Truöl, P, Tsipolitis, G, Tsurin, I, Turnau, J, Turney, JE, Tzamariudaki, E, Udluft, S, Uraev, A, Urban, M, Usik, A, Valkár, S, Valkárová, A, Vallée, C, van Mechelen, P, Vassiliev, S, Vazdik, Y, Vest, A, Vichnevski, A, Wacker, K, Wagner, J, Wallny, R, Waugh, B, Weber, G, Wegener, D, Werner, C, Werner, N, Wessels, M, White, G, Wiesand, S, Wilksen, T, Winde, M, Winter, GG, Wissing, C, Wobisch, M, Woehrling, EE, Wünsch, E, Wyatt, AC, Žáček, J, Zálešák, J, Zhang, Z, Zhokin, A, Zomer, F & Zur Nedden, M 2002, 'Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration', European Physical Journal C, vol. 25, no. 4, pp. 495-509. https://doi.org/10.1140/epjc/s2002-01039-8

TY - JOUR

T1 - Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration

AU - Adloff, C.

AU - Andreev, V.

AU - Andrieu, B.

AU - Anthonis, T.

AU - Astvatsatourov, A.

AU - Babaev, A.

AU - Bähr, J.

AU - Baranov, P.

AU - Barrelet, E.

AU - Bartel, W.

AU - Becker, J.

AU - Beckingham, M.

AU - Beglarian, A.

AU - Behnke, O.

AU - Beier, C.

AU - Belousov, A.

AU - Berger, Ch

AU - Berndt, T.

AU - Bizot, J. C.

AU - Böhme, J.

AU - Boudry, V.

AU - Braunschweig, W.

AU - Brisson, V.

AU - Bröker, H. B.

AU - Brown, D. P.

AU - Bruckner, W.

AU - Bruncko, D.

AU - Büsser, F. W.

AU - Bunyatyan, A.

AU - Burrage, A.

AU - Buschhorn, G.

AU - Bystritskaya, L.

AU - Campbell, A. J.

AU - Carli, T.

AU - Caron, S.

AU - Cassol-Brunner, F.

AU - Clarke, D.

AU - Collard, C.

AU - Contreras, J. G.

AU - Coppens, Y. R.

AU - Coughlan, J. A.

AU - Cousinou, M. C.

AU - Cox, B. E.

AU - Cozzika, G.

AU - Cvach, J.

AU - Dainton, J. B.

AU - Dau, W. D.

AU - Daum, K.

AU - Davidsson, M.

AU - Delcourt, B.

AU - Delerue, N.

AU - Demirchyan, R.

AU - de Roeck, A.

AU - de Wolf, E. A.

AU - Diaconu, C.

AU - Dingfelder, J.

AU - Dixon, P.

AU - Dodonov, V.

AU - Dowell, J. D.

AU - Droutskoi, A.

AU - Dubak, A.

AU - Duprel, C.

AU - Eckerlin, G.

AU - Eckstein, D.

AU - Efremenko, V.

AU - Egli, S.

AU - Eichler, R.

AU - Eisele, F.

AU - Eisenhandler, E.

AU - Ellerbrock, M.

AU - Elsen, E.

AU - Erdmann, M.

AU - Erdmann, W.

AU - Faulkner, P. J W

AU - Favart, L.

AU - Fedotov, A.

AU - Felst, R.

AU - Ferencei, J.

AU - Ferron, S.

AU - Fleischer, M.

AU - Fleischmann, P.

AU - Fleming, Y. H.

AU - Flügge, G.

AU - Fomenko, A.

AU - Foresti, I.

AU - Formánek, J.

AU - Franke, G.

AU - Frising, G.

AU - Gabathuler, E.

AU - Gabathuler, K.

AU - Garvey, J.

AU - Gassner, J.

AU - Gayler, J.

AU - Gerhards, R.

AU - Gerlich, C.

AU - Ghazaryan, S.

AU - Goerlich, L.

AU - Gogitidze, N.

AU - Grab, C.

AU - Grabski, V.

AU - Grässler, H.

AU - Greenshaw, T.

AU - Grindhammer, G.

AU - Hadig, T.

AU - Haidt, D.

AU - Hajduk, L.

AU - Haller, J.

AU - Haynes, W. J.

AU - Heinemann, B.

AU - Heinzelmann, G.

AU - Henderson, R. C W

AU - Hengstmann, S.

AU - Henschel, H.

AU - Heremans, R.

AU - Herrera, G.

AU - Herynek, I.

AU - Hildebrandt, M.

AU - Hilgers, M.

AU - Hiller, K. H.

AU - Hladký, J.

AU - Höting, P.

AU - Hoffmann, D.

AU - Horisberger, R.

AU - Hovhannisyan, A.

AU - Hurling, S.

AU - Ibbotson, M.

AU - Işsever, C.

AU - Jacquet, M.

AU - Jaffre, M.

AU - Janauschek, L.

AU - Janssen, X.

AU - Jemanov, V.

AU - Jönsson, L.

AU - Johnson, C.

AU - Johnson, D. P.

AU - Jones, M. A S

AU - Jung, H.

AU - Kant, D.

AU - Kapichine, M.

AU - Karlsson, M.

AU - Karschnick, O.

AU - Keil, F.

AU - Keller, N.

AU - Kennedy, J.

AU - Kenyon, I. R.

AU - Kermiche, S.

AU - Kiesling, C.

AU - Kjellberg, P.

AU - Klein, M.

AU - Kleinwort, C.

AU - Kluge, T.

AU - Knies, G.

AU - Koblitz, B.

AU - Kolya, S. D.

AU - Korbel, V.

AU - Kostka, P.

AU - Kotelnikov, S. K.

AU - Koutouev, R.

AU - Koutov, A.

AU - Kroseberg, J.

AU - Krüger, K.

AU - Kuhr, T.

AU - Kurča, T.

AU - Lamb, D.

AU - Landon, M. P J

AU - Lange, W.

AU - Laštovička, T.

AU - Laycock, P.

AU - Lebailly, E.

AU - Lebedev, A.

AU - Leißner, B.

AU - Lemrani, R.

AU - Lendermann, V.

AU - Levonian, S.

AU - Lindstroem, M.

AU - List, B.

AU - Lobodzinska, E.

AU - Lobodzinski, B.

AU - Loginov, A.

AU - Loktionova, N.

AU - Lubimov, V.

AU - Lüders, S.

AU - Lüke, D.

AU - Lytkin, L.

AU - Malden, N.

AU - Malinovski, E.

AU - Malinovski, I.

AU - Mangano, S.

AU - Maraček, R.

AU - Marage, P.

AU - Marks, J.

AU - Marshall, R.

AU - Martyn, H. U.

AU - Martyniak, J.

AU - Maxfield, S. J.

AU - Meer, D.

AU - Mehta, A.

AU - Meier, K.

AU - Meyer, A. B.

AU - Meyer, H.

AU - Meyer, J.

AU - Meyer, P. O.

AU - Mikocki, S.

AU - Milstead, D.

AU - Mohrdieck, S.

AU - Mondragon, M. N.

AU - Moreau, F.

AU - Morozov, A.

AU - Morris, J. V.

AU - Müller, K.

AU - Murín, P.

AU - Nagovizin, V.

AU - Naroska, B.

AU - Naumann, J.

AU - Naumann, Th

AU - Nellen, G.

AU - Newman, P. R.

AU - Niebergall, F.

AU - Niebuhr, C.

AU - Nix, O.

AU - Nowak, G.

AU - Olsson, J. E.

AU - Ozerov, D.

AU - Panassik, V.

AU - Pascaud, C.

AU - Patel, G. D.

AU - Peez, M.

AU - Perez, E.

AU - Petrukhin, A.

AU - Phillips, J. P.

AU - Pitzl, D.

AU - Pöschl, R.

AU - Potachnikova, I.

AU - Povh, B.

AU - Rädel, G.

AU - Rauschenberger, J.

AU - Reimer, P.

AU - Reisert, B.

AU - Reyna, D.

AU - Risler, C.

AU - Rizvi, E.

AU - Robmann, P.

AU - Roosen, R.

AU - Rostovtsev, A.

AU - Rusakov, S.

AU - Rybicki, K.

AU - Sankey, D. P C

AU - Schätzel, S.

AU - Scheins, J.

AU - Schilling, F. P.

AU - Schleper, P.

AU - Schmidt, D.

AU - Schmidt, S.

AU - Schmitt, S.

AU - Schneider, M.

AU - Schoeffel, L.

AU - Schöning, A.

AU - Schörner, T.

AU - Schröder, V.

AU - Schultz-Coulon, H. C.

AU - Schwanenberger, C.

AU - Sedlák, K.

AU - Sefkow, F.

AU - Shekelyan, V.

AU - Sheviakov, I.

AU - Shtarkov, L. N.

AU - Sirois, Y.

AU - Sloan, T.

AU - Smirnov, P.

AU - Soloviev, Y.

AU - South, D.

AU - Spaskov, V.

AU - Specka, A.

AU - Spitzer, H.

AU - Stamen, R.

AU - Stella, B.

AU - Stiewe, J.

AU - Strauch, I.

AU - Straumann, U.

AU - Swart, M.

AU - Tchetchelnitski, S.

AU - Thompson, G.

AU - Thompson, P. D.

AU - Tobien, N.

AU - Tomasz, F.

AU - Traynor, D.

AU - Truöl, P.

AU - Tsipolitis, G.

AU - Tsurin, I.

AU - Turnau, J.

AU - Turney, J. E.

AU - Tzamariudaki, E.

AU - Udluft, S.

AU - Uraev, A.

AU - Urban, M.

AU - Usik, A.

AU - Valkár, S.

AU - Valkárová, A.

AU - Vallée, C.

AU - van Mechelen, P.

AU - Vassiliev, S.

AU - Vazdik, Y.

AU - Vest, A.

AU - Vichnevski, A.

AU - Wacker, K.

AU - Wagner, J.

AU - Wallny, R.

AU - Waugh, B.

AU - Weber, G.

AU - Wegener, D.

AU - Werner, C.

AU - Werner, N.

AU - Wessels, M.

AU - White, G.

AU - Wiesand, S.

AU - Wilksen, T.

AU - Winde, M.

AU - Winter, G. G.

AU - Wissing, Ch

AU - Wobisch, M.

AU - Woehrling, E. E.

AU - Wünsch, E.

AU - Wyatt, A. C.

AU - Žáček, J.

AU - Zálešák, J.

AU - Zhang, Z.

AU - Zhokin, A.

AU - Zomer, F.

AU - Zur Nedden, M.

N1 - {Eur.Phys.J.C25:495-509},2002

PY - 2002/11

Y1 - 2002/11

N2 - Signals of QCD instanton-induced processes are searched for in deep-inelástic 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 ≲ Q2 <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.

AB - Signals of QCD instanton-induced processes are searched for in deep-inelástic 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 ≲ Q2 <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.

KW - High Energy Physics - Experiment

U2 - 10.1140/epjc/s2002-01039-8

DO - 10.1140/epjc/s2002-01039-8

M3 - Article

SN - 1434-6044

VL - 25

SP - 495

EP - 509

JO - European Physical Journal C

JF - European Physical Journal C

IS - 4

ER -

Search for QCD instanton-induced processes in deep-inelastic scattering at HERA: The H1 collaboration

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