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ZEUS results on the measurement and phenomenology of F2 at low x and low Q2

EUROPEAN PHYSICAL JOURNAL C 7:4 (1999) 609-630

Authors:

J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, RL Talaga, R Yoshida, H Zhang, MCK Mattingly, G Abbiendi, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, GC Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, N Coppola, M Corradi, S De Pasquale, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, G Sartorelli, YZ Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, M Eckert, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, HP Jakob, A Kappes, UF Katz, R Kerger, E Paul, M Pfeiffer, H Schnurbusch, A Weber, H Wieber, DS Bailey, O Barret, WN Cottingham, B Foster, R Hall-Wilton, GP Heath, HF Heath, JD McFall, D Piccioni, DG Roff, J Scott, RJ Tapper, M Capua, L Iannotti, A Mastroberardino, M Schioppa, G Susinno, JY Kim, JH Lee, IT Lim, MY Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, JA Parsons, D Ritz, S Sampson, F Sciulli, PB Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, J Figiel, K Klimek, MB Przybycien, L Zawiejski, L Adamczyk, B Bednarek, M Bukowy, AM Czermak, K Jelen, D Kisielewska, T Kowalski, M Przybycien, E Rulikowska-Zarebska, L Suszycki, J Zajac, Z Dulinski, A Kotanski, LAT Bauerdick, U Behrens, H Beier, JK Bienlein, K Desler, G Drews, U Fricke, F Goebel, P Göttlicher, R Graciani, T Haas, W Hain, GF Hartner, D Hasell, K Hebbel, KF Johnson, M Kasemann, W Koch, U Kötz, H Kowalski, L Lindemann, B Löhr, M Martínez, J Milewski, M Milite, T Monteiro, D Notz, A Pellegrino, F Pelucchi, K Piotrzkowski, M Rohde, J Roldán, JJ Ryan, PRB Saull, AA Savin, U Schneekloth, O Schwarzer, F Selonke, M Sievers, S Stonjek, B Surrow, E Tassi, D Westphal, G Wolf, U Wollmer, C Youngman, W Zeuner, BD Burow, C Coldewey, HJ Grabosch, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Maccarrone, L Votano, A Bamberger, S Eisenhardt, P Markun, H Raach, T Trefzger, S Wölfle, JT Bromley, NH Brook, PJ Bussey, AT Doyle, SW Lee, N Macdonald, GJ McCance, DH Saxon, LE Sinclair, IO Skillicorn, E Strickland, R Waugh, I Bohnet, N Gendner, U Holm, A Meyer-Larsen, H Salehi, K Wick, A Garfagnini, I Gialas, LK Gladilin, D Kçira, R Klanner, E Lohrmann, G Poelz, F Zetsche, TC Bacon, I Butterworth, JE Cole, G Howell, L Lamberti, KR Long, DB Miller, N Pavel, A Prinias, JK Sedgbeer, D Sideris, R Walker, U Mallik, SM Wang, JT Wu, P Cloth, D Filges, T Ishii, M Kuze, I Suzuki, K Tokushuku, S Yamada, K Yamauchi, Y Yamazaki, SJ Hong, SB Lee, SW Nam, SK Park, H Lim, IH Park, D Son, F Barreiro, JP Fernández, G García, C Glasman, JM Hernández, L Hervás, L Labarga, J del Peso, J Puga, I Redondo, J Terrón, JF de Trocóniz, F Corriveau, DS Hanna, J Hartmann, WN Murray, A Ochs, M Riveline, DG Stairs, M St-Laurent, T Tsurugai, V Bashkirov, BA Dolgoshein, A Stifutkin, GL Bashindzhagyan, PF Ermolov, YA Golubkov, LA Khein, NA Korotkova, IA Korzhavina, VA Kuzmin, OY Lukina, AS Proskuryakov, LM Shcheglova, AN Solomin, SA Zotkin, C Bokel, M Botje, N Brümmer, J Engelen, E Koffeman, P Kooijman, A van Sighem, H Tiecke, N Tuning, W Verkerke, J Vossebeld, L Wiggers, E de Wolf, D Acosta, B Bylsma, LS Durkin, J Gilmore, CM Ginsburg, CL Kim, TY Ling, P Nylander, TA Romanowski, HE Blaikley, RJ Cashmore, AM Cooper-Sarkar, RCE Devenish, JK Edmonds, J Grosse-Knetter, N Harnew, C Nath, VA Noyes, A Quadt, O Ruske, JR Tickner, R Walczak, DS Waters, A Bertolin, R Brugnera, R Carlin, F Dal Corso, U Dosselli, S Limentani, M Morandin, M Posocco, L Stanco, R Stroili, C Voci, BY Oh, JR Okrasinski, WS Toothacker, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, M Raso, JC Hart, NA McCubbin, TP Shah, D Epperson, C Heusch, JT Rahn, HFW Sadrozinski, A Seiden, R Wichmann, DC Williams, H Abramowicz, G Briskin, S Dagan, S Kananov, A Levy, T Abe, T Fusayasu, M Inuzuka, K Nagano, K Umemori, T Yamashita, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, T Nishimura, M Arneodo, R Cirio, M Costa, MI Ferrero, S Maselli, V Monaco, C Peroni, MC Petrucci, M Ruspa, M Dardo, DC Bailey, CP Fagerstroem, R Galea, R Koop, GM Levman, JF Martin, RS Orr, S Polenz, A Sabetfakhri, D Simmons, JM Butterworth, CD Catterall, ME Hayes, EA Heaphy, TW Jones, JB Lane, RL Saunders, MR Sutton, M Wing, J Ciborowski, G Grzelak, RJ Nowak, JM Pawlak, R Pawlak, B Smalska, T Tymieniecka, AK Wróblewski, JA Zakrzewski, AF Zarnecki, M Adamus, O Deppe, Y Eisenberg, D Hochman, U Karshon, WF Badgett, D Chapin, R Cross, C Foudas, S Mattingly, DD Reeder, WH Smith, A Vaiciulis, T Wildschek, M Wodarczyk, A Deshpande, S Dhawan, VW Hughes, S Bhadra, WR Frisken, M Khakzad, WB Schmidke
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A search for heavy stable and long-lived squarks and sleptons in e+e- collisions at energies from 130 to 183 GeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 444:3-4 (1998) 491-502

Authors:

P Abreu, W Adam, T Adye, P Adzic, T Aldeweireld, GD Alekseev, R Alemany, T Allmendinger, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, K Belous, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, AJ Camacho Rozas, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, M Chapkin, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, P Collins, M Colomer, R Contri, E Cortina

Abstract:

A search for stable and long-lived heavy charged particles used the data taken by the DELPHI experiment at energies from 130 to 183 GeV. The Cherenkov light detected in the Ring Imaging Cherenkov Detector and the ionization loss measured in the Time Projection Chamber identify heavy particles from masses of 2 to nearly 89 GeV/c2. Upper limits are given on the production cross-section and masses of sleptons, free squarks with a charge of q = ± 2/3e and hadronizing squarks. © 1998 Elsevier Science B.V. All rights reserved.
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Measurement of three-jet distributions in photoproduction at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 443:1-4 (1998) 394-408

Authors:

J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, R Stanek, R Yoshida, MCK Mattingly, G Abbiendi, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, N Coppola, M Corradi, S de Pasquale, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, G Sartorelli, Y Zamora Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, M Eckert, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, HP Jakob, A Kappes, UF Katz, R Kerger, E Paul, M Pfeiffer, H Schnurbusch, A Weber, H Wieber, DS Bailey, O Barret, WN Cottingham, B Foster, R Hall-Wilton, GP Heath, HF Heath, JD McFall, D Piccioni, J Scott, RJ Tapper, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, JA Parsons, S Ritz, R Sacchi, S Sampson, F Sciulli, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, J Figiel, K Klimek, MB Przybycień, L Zawiejski

Abstract:

The cross section for the photoproduction of events containing three jets with a three-jet invariant mass of M31 > 50 GeV has been measured with the ZEUS detector at HERA. The three-jet angular distributions are inconsistent with a uniform population of the available phase space but are well described by parton shower models and script O sign(α α2s) pQCD calculations. Comparisons with the parton shower model indicate a strong contribution from initial state radiation as well as a sensitivity to the effects of colour coherence. © 1998 Elsevier Science B.V. All rights reserved.
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First observation of Cherenkov ring images using hybrid photon detectors

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 411:2-3 (1998) 249-264

Authors:

E Albrecht, G Barber, JH Bibby, NH Brook, A Duane, M French, V Gibson, R Giles, AW Halley, N Harnew, M John, DG Miller, V O'Shea, R Schomaker, N Smale, D Websdale, G Wilkinson, SA Wotton

Abstract:

A ring-imaging Cherenkov detector, equipped with hybrid photon detectors, has been operated in a charged-particlc beam. Focussed ring images from various particle types were detected using silica aerogel, air and C4F10 gas radiators. The detector, a prototype for the CERN LHC-B experiment, is described and first observations are reported, © IWS Elsevier Science B.V. All rights reserved.
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A search for η′c production in photon-photon fusion at LEP

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 441:1-4 (1998) 479-490

Authors:

P Abreu, W Adam, T Adye, P Adzic, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Asman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, K Belous, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, AJ Camacho Rozas, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, C Cerruti, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chochula, V Chorowicz, J Chudoba, P Collins, M Colomer, R Contri, E Cortina, G Cosme, F Cossutti, JH Cowell, HB Crawley

Abstract:

A search for the production of the η′c meson, the first radial excitation of the ground state of charmonium ηc(2980), in the photon-photon fusion reaction at LEP has been performed using the data collected by the DELPHI detector during 1992-1996. No evidence of η′c production is found in the mass region 3520-3800 MeV/c2. An upper limit for the ratio of the two-photon widths of the η′c and ηc is obtained. © 1998 Published by Elsevier Science B.V. All rights reserved.
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