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; Bartel, W; Becker, J; Beckingham, M; Beglarian, A; Behnke, O; Beier, C; Belousov, A; Berger, C; Berndt, T; Bizot, JC; Bohme, J; Boudry, V; Braunschweig, W; Brisson, V; Broker, HB; Brown, DP; Bruncko, D; Busser, 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; Flugge, G; Fomenko, A; Foresti, I; Formanek, 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; Grassler, H; Greenshaw, T; Grindhammer, G; Hadig, T; Haidt, D; Hajduk, L; Haller, L; Haynes, WJ; Heinemann, B; Heinzelmann, G; Henderson, RCW; Hengstmann, S; Henschel, H; Heremans, R; Herrera, G; Herynek, I; Hildebrandt, M; Hilgers, M; Hiller, KH; Hladky, J; Hoting, P; Hoffmann, D; Horisberger, R; Hovhannisyan, A; Hurling, S; Ibbotson, M; Issever, C; Jacquet, M; Jaffre, M; Janauschek, L; Janssen, X; Jemanov, V; Jonsson, 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; Lastovicka, 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; Luders, S; Luke, D; Lytkin, L; Malden, N; Malinovski, E; Malinovski, I; Mangano, S; Maracek, 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; Muller, K; Murin, 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; Poschl, R; Potachnikova, I; Povh, B; Radel, 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; Schatzel, S; Scheins, J; Schilling, FP; Schleper, P; Schmidt, D; Schmidt, D; Schmidt, S; Schmidt, S; Schneider, M; Schoeffel, L; Schoning, A; Schorner, T; Schroder, V; Schultz-Coulon, HC; Schwanenberger, C; Sedlak, 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; Truol, P; Tsipolitis, G; Tsurin, I; Turnau, J; Turney, JE; Tzamariudaki, E; Udluft, S; Uraev, A; Urban, M; Usik, A; Valkar, S; Valkarova, A; Vallee, 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; Wunsch, E; Wyatt, AC; Zacek, J; Zalesak, J; Zhang, Z; Zhokin, A; Zomer, F; zur Nedden, M

dc.contributor.author	Adloff, C	en
dc.contributor.author	Andreev, V	en
dc.contributor.author	Andrieu, B	en
dc.contributor.author	Anthonis, T	en
dc.contributor.author	Astvatsatourov, A	en
dc.contributor.author	Babaev, A	en
dc.contributor.author	Bahr, J	en
dc.contributor.author	Baranov, P	en
dc.contributor.author	Barrelet, E	en
dc.contributor.author	Bartel, W	en
dc.contributor.author	Becker, J	en
dc.contributor.author	Beckingham, M	en
dc.contributor.author	Beglarian, A	en
dc.contributor.author	Behnke, O	en
dc.contributor.author	Beier, C	en
dc.contributor.author	Belousov, A	en
dc.contributor.author	Berger, C	en
dc.contributor.author	Berndt, T	en
dc.contributor.author	Bizot, JC	en
dc.contributor.author	Bohme, J	en
dc.contributor.author	Boudry, V	en
dc.contributor.author	Braunschweig, W	en
dc.contributor.author	Brisson, V	en
dc.contributor.author	Broker, HB	en
dc.contributor.author	Brown, DP	en
dc.contributor.author	Bruncko, D	en
dc.contributor.author	Busser, FW	en
dc.contributor.author	Bunyatyan, A	en
dc.contributor.author	Burrage, A	en
dc.contributor.author	Buschhorn, G	en
dc.contributor.author	Bystritskaya, L	en
dc.contributor.author	Campbell, AJ	en
dc.contributor.author	Carli, T	en
dc.contributor.author	Caron, S	en
dc.contributor.author	Cassol-Brunner, F	en
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dc.contributor.author	Collard, C	en
dc.contributor.author	Contreras, JG	en
dc.contributor.author	Coppens, YR	en
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dc.contributor.author	Dau, WD	en
dc.contributor.author	Daum, K	en
dc.contributor.author	Davidsson, M	en
dc.contributor.author	Delcourt, B	en
dc.contributor.author	Delerue, N	en
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dc.contributor.author	Dowell, JD	en
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dc.contributor.author	Duprel, C	en
dc.contributor.author	Eckerlin, G	en
dc.contributor.author	Eckstein, D	en
dc.contributor.author	Efremenko, V	en
dc.contributor.author	Egli, S	en
dc.contributor.author	Eichler, R	en
dc.contributor.author	Eisele, F	en
dc.contributor.author	Eisenhandler, E	en
dc.contributor.author	Ellerbrock, M	en
dc.contributor.author	Elsen, E	en
dc.contributor.author	Erdmann, M	en
dc.contributor.author	Erdmann, W	en
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dc.contributor.author	Fleischer, M	en
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dc.contributor.author	Lebailly, E	en
dc.contributor.author	Lebedev, A	en
dc.contributor.author	Leissner, B	en
dc.contributor.author	Lemrani, R	en
dc.contributor.author	Lendermann, V	en
dc.contributor.author	Levonian, S	en
dc.contributor.author	Lindstroem, M	en
dc.contributor.author	List, B	en
dc.contributor.author	Lobodzinska, E	en
dc.contributor.author	Lobodzinski, B	en
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dc.contributor.author	Loktionova, N	en
dc.contributor.author	Lubimov, V	en
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dc.contributor.author	Luke, D	en
dc.contributor.author	Lytkin, L	en
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dc.contributor.author	Mangano, S	en
dc.contributor.author	Maracek, R	en
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dc.contributor.author	Wissing, C	en
dc.contributor.author	Wobisch, M	en
dc.contributor.author	Woehrling, EE	en
dc.contributor.author	Wunsch, E	en
dc.contributor.author	Wyatt, AC	en
dc.contributor.author	Zacek, J	en
dc.contributor.author	Zalesak, J	en
dc.contributor.author	Zhang, Z	en
dc.contributor.author	Zhokin, A	en
dc.contributor.author	Zomer, F	en
dc.contributor.author	zur Nedden, M	en
dc.date.accessioned	2014-03-01T01:52:10Z
dc.date.available	2014-03-01T01:52:10Z
dc.date.issued	2002	en
dc.identifier.issn	1434-6044	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26589
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	POSITRON-PROTON COLLISIONS	en
dc.subject.other	LIQUID ARGON CALORIMETER	en
dc.subject.other	MONTE-CARLO GENERATOR	en
dc.subject.other	PERTURBATION-THEORY	en
dc.subject.other	CROSS-SECTIONS	en
dc.subject.other	JET FRAGMENTATION	en
dc.subject.other	EVENT GENERATOR	en
dc.subject.other	EP SCATTERING	en
dc.subject.other	MODEL	en
dc.subject.other	CASCADES	en
dc.title	Search for QCD instanton-induced processes in deep-inelastic scattering at HERA	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2002	en
heal.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 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.	en
heal.publisher	SPRINGER-VERLAG	en
heal.journalName	EUROPEAN PHYSICAL JOURNAL C	en
dc.identifier.isi	ISI:000179928900001	en
dc.identifier.volume	25	en
dc.identifier.issue	4	en
dc.identifier.spage	495	en
dc.identifier.epage	509	en