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

European Physical Journal C 34:3 (2004) 255-265

Authors:

S Chekanov, M Derrick, D Krakauer, JH Loizides, S Magill, S Miglioranzi, B Musgrave, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, P Giusti, G Iacobucci, A Margotti, A Montanari, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, O Kind, U Meyer, E Paul, J Rautenberg, R Renner, A Stifutkin, J Tandler, KC Voss, M Wang, A Weber, DS Bailey, NH Brook, JE Cole, GP Heath, T Namsoo, S Robins, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, JY Kim, YK Kim, JH Lee, IT Lim, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, Y Ning, S Paganis, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, K Olkiewicz, P Stopa, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, AM Kowal, M Kowal, T Kowalski, M Przybycień, L Suszycki, D Szuba, J Szuba, A Kotański, W Slomiński, V Adler, U Behrens, I Bloch, K Borras, V Chiochia

Abstract:

A search for QCD-instanton-induced events in deep inelastic ep scattering has been performed with the ZEUS detector at the HERA collider, using data corresponding to an integrated luminosity of 38 pb-1. A kinematic range defined by cuts on the photon virtuality, Q2 > 120 GeV 2, and on the Bjorken scaling variable, x > 10-3, has been investigated. The QCD-instanton induced events were modelled by the Monte Carlo generator QCDINS. A background-independent, conservative 95% confidence level upper limit for the instanton cross section of 26 pb is obtained, to be compared with the theoretically expected value of 8.9pb.

Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s) = 1.96 TeV using Dilepton Events

ArXiv hep-ex/0404036 (2004)

Direct photon cross section with conversions at CDF

ArXiv hep-ex/0404022 (2004)

The Underlying Event in Hard Interactions at the Tevatron pbarp Collider

ArXiv hep-ex/0404004 (2004)

Heavy flavor properties of jets produced in pp¯ interactions at s=1.8 TeV

Physical Review D American Physical Society (APS) 69:7 (2004) 072004

Authors:

D Acosta, D Ambrose, K Anikeev, J Antos, G Apollinari, T Arisawa, A Artikov, F Azfar, P Azzi-Bacchetta, N Bacchetta, VE Barnes, BA Barnett, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, J Bellinger, A Beretvas, A Bhatti, D Bisello, C Blocker, B Blumenfeld, A Bocci, G Bolla, A Bolshov, D Bortoletto, J Budagov, HS Budd, K Burkett, G Busetto, S Cabrera, W Carithers, D Carlsmith, R Carosi, A Castro, D Cauz, A Cerri, C Chen, YC Chen, G Chiarelli, G Chlachidze, ML Chu, W-H Chung, YS Chung, AG Clark, M Coca, M Convery, M Cordelli, J Cranshaw, D Dagenhart, S D’Auria, S Dell’Agnello, P de Barbaro, S De Cecco, M Dell’Orso, L Demortier, M Deninno, D De Pedis, C Dionisi, S Donati, M D’Onofrio, T Dorigo, R Eusebi, S Farrington, JP Fernandez, RD Field, I Fiori, A Foland, LR Flores-Castillo, M Franklin, J Friedman, I Furic, M Gallinaro, AF Garfinkel, E Gerstein, S Giagu, P Giannetti, K Giolo, M Giordani, P Giromini, V Glagolev, G Gomez, I Gorelov, AT Goshaw, K Goulianos, A Gresele, M Guenther, J Guimaraes da Costa, E Halkiadakis, C Hall, R Handler, F Happacher, K Hara, F Hartmann, K Hatakeyama, J Hauser, J Heinrich, M Hennecke, M Herndon, A Hocker, S Hou, BT Huffman, G Introzzi, M Iori, A Ivanov, Y Iwata, B Iyutin, M Jones, M Karagoz Unel, K Karr, Y Kato, B Kilminster, DH Kim, MJ Kim, SB Kim, SH Kim, TH Kim, M Kirby, L Kirsch, S Klimenko, K Kondo, J Konigsberg, A Korn, A Korytov, K Kotelnikov, J Kroll, M Kruse, AT Laasanen, S Lami, S Lammel, J Lancaster, G Latino, Y Le, J Lee, N Leonardo, S Leone, M Lindgren, NS Lockyer, A Loginov, M Loreti, D Lucchesi, S Lusin, L Lyons, R Madrak, P Maksimovic, L Malferrari, M Mariotti, M Martin, V Martin, M Martínez, P Mazzanti, M Menguzzato, A Menzione, C Mesropian, A Meyer, S Miscetti, G Mitselmakher, Y Miyazaki, N Moggi, M Mulhearn, T Muller, A Munar, P Murat, I Nakano, R Napora, SH Oh, YD Oh, T Ohsugi, T Okusawa, C Pagliarone, F Palmonari, R Paoletti, V Papadimitriou, A Parri, G Pauletta, T Pauly, C Paus, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, A Pompoš, L Pondrom, T Pratt, F Prokoshin, F Ptohos, O Poukhov, G Punzi, J Rademacker, A Rakitine, H Ray, A Reichold, P Renton, M Rescigno, F Rimondi, L Ristori, WJ Robertson, T Rodrigo, S Rolli, L Rosenson, R Rossin, C Rott, A Roy, A Ruiz, D Ryan, A Safonov, WK Sakumoto, D Saltzberg, L Santi, S Sarkar, A Savoy-Navarro, P Schlabach, M Schmitt, L Scodellaro, A Scribano, A Sedov, S Seidel, Y Seiya, A Semenov, F Semeria, T Shibayama, M Shimojima, A Sidoti, A Sill, K Sliwa, R Snihur, M Spezziga, F Spinella, M Spiropulu, R St. Denis, A Stefanini, A Sukhanov, K Sumorok, T Suzuki, R Takashima, K Takikawa, PK Teng, K Terashi, S Tether, AS Thompson, D Tonelli, J Tseng, D Tsybychev, N Turini, F Ukegawa, T Unverhau, E Vataga, G Velev, I Vila, R Vilar, M von der Mey, W Wagner, C Wang, MJ Wang, SM Wang, B Ward, S Waschke, B Whitehouse, HH Williams, M Wolter, X Wu, K Yi, T Yoshida, I Yu, S Yu, L Zanello, A Zanetti, S Zucchelli