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Measurement of the proton structure function F2 and σγ*ρ tot at low Q2 and very low x at HERA

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 407:3-4 (1997) 432-448

Authors:

J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, RL Talaga, R Yoshida, H Zhang, MCK Mattingly, E Anselmo, R Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, M Corradi, S de Pasquale, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, F Ricci, 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, UF Katz, R Kerger, E Paul, M Pfeiffer, C Rembser, J Stamm, R Wedemeyer, H Wieber, DS Bailey, S Campbell-Robson, WN Cottingham, B Foster, R Hall-Wilton, ME Hayes, GP Heath, HF Heath, D Piccioni, DG Roff, RJ Tapper, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, JY Kim, JH Lee, IT Lim, MY Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, JA Parsons, S Ritz, S Sampson, F Sciulli, PB Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, Z Jakubowski

Abstract:

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q2 inelastic neutral current scattering, e+p → e+X, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton (γ*p) cross-section is presented for 0.11 ≤ Q2 ≤ 0.65 GeV2 and 2 × 10-6 ≤ x ≤ 6 × 10-5, corresponding to a range in the γ*p c.m. energy of 100 ≤ W ≤ 230 GeV. Comparisons with various models are also presented. © 1997 Published by Elsevier Science B.V.
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Properties of six-jet events with large six-jet mass at the Fermilab proton-antiproton collider

Physical Review D American Physical Society (APS) 56:5 (1997) 2532-2543

Authors:

F Abe, H Akimoto, A Akopian, MG Albrow, SR Amendolia, D Amidei, J Antos, S Aota, G Apollinari, T Asakawa, W Ashmanskas, M Atac, F Azfar, P Azzi-Bacchetta, N Bacchetta, W Badgett, S Bagdasarov, MW Bailey, J Bao, P de Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, M Barone, E Barzi, G Bauer, T Baumann, F Bedeschi, S Behrends, S Belforte, G Bellettini, J Bellinger, D Benjamin, J Benlloch, J Bensinger, D Benton, A Beretvas, JP Berge, J Berryhill, S Bertolucci, B Bevensee, A Bhatti, K Biery, M Binkley, D Bisello, RE Blair, C Blocker, A Bodek, W Bokhari, V Bolognesi, G Bolla, D Bortoletto, J Boudreau, L Breccia, C Bromberg, N Bruner, E Buckley-Geer, HS Budd, K Burkett, G Busetto, A Byon-Wagner, KL Byrum, J Cammerata, C Campagnari, M Campbell, A Caner, W Carithers, D Carlsmith, A Castro, D Cauz, Y Cen, F Cervelli, PS Chang, PT Chang, HY Chao, J Chapman, M-T Cheng, G Chiarelli, T Chikamatsu, CN Chiou, L Christofek, S Cihangir, AG Clark, M Cobal, E Cocca, M Contreras, J Conway, J Cooper, M Cordelli, C Couyoumtzelis, D Crane, D Cronin-Hennessy, R Culbertson, T Daniels, F DeJongh, S Delchamps, S Dell’Agnello, M Dell’Orso, R Demina, L Demortier, M Deninno, PF Derwent, T Devlin, JR Dittmann, S Donati, J Done, T Dorigo, A Dunn, N Eddy, K Einsweiler, JE Elias, R Ely, E Engels, D Errede, S Errede, Q Fan, G Feild, C Ferretti, I Fiori, B Flaugher, GW Foster, M Franklin, M Frautschi, J Freeman, J Friedman, H Frisch, Y Fukui, S Funaki, S Galeotti, M Gallinaro, O Ganel, M Garcia-Sciveres, AF Garfinkel, C Gay, S Geer, DW Gerdes, P Giannetti, N Giokaris, P Giromini, G Giusti, L Gladney, D Glenzinski, M Gold, J Gonzalez, A Gordon, AT Goshaw, Y Gotra, K Goulianos, H Grassmann, L Groer, C Grosso-Pilcher, G Guillian, RS Guo, C Haber, E Hafen, SR Hahn, R Hamilton, R Handler, RM Hans, F Happacher, K Hara, AD Hardman, B Harral, RM Harris, SA Hauger, J Hauser, C Hawk, E Hayashi, J Heinrich, B Hinrichsen, KD Hoffman, M Hohlmann, C Holck, R Hollebeek, L Holloway, S Hong, G Houk, P Hu, BT Huffman, R Hughes, J Huston, J Huth, J Hylen, H Ikeda, M Incagli, J Incandela, G Introzzi, J Iwai, Y Iwata, H Jensen, U Joshi, RW Kadel, E Kajfasz, H Kambara, T Kamon, T Kaneko, K Karr, H Kasha, Y Kato, TA Keaffaber, K Kelley, RD Kennedy, R Kephart, P Kesten, D Kestenbaum, H Keutelian, F Keyvan, B Kharadia, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kim, L Kirsch, P Koehn, K Kondo, J Konigsberg, S Kopp, K Kordas, A Korytov, W Koska, E Kovacs, W Kowald, M Krasberg, J Kroll, M Kruse, T Kuwabara, SE Kuhlmann, E Kuns, AT Laasanen, S Lami, S Lammel, JI Lamoureux, M Lancaster, T LeCompte, S Leone, JD Lewis, P Limon, M Lindgren, TM Liss, JB Liu, YC Liu, N Lockyer, O Long, C Loomis, M Loreti, J Lu, D Lucchesi, P Lukens, S Lusin, J Lys, K Maeshima, A Maghakian, P Maksimovic, M Mangano, J Mansour, M Mariotti, JP Marriner, A Martin, JAJ Matthews, R Mattingly, P McIntyre, P Melese, A Menzione, E Meschi, S Metzler, C Miao, T Miao, G Michail, R Miller, H Minato, S Miscetti, M Mishina, H Mitsushio, T Miyamoto, S Miyashita, N Moggi, Y Morita, A Mukherjee, T Muller, P Murat, H Nakada, I Nakano, C Nelson, D Neuberger, C Newman-Holmes, C-YP Ngan, M Ninomiya, L Nodulman, SH Oh, KE Ohl, T Ohmoto, T Ohsugi, R Oishi, M Okabe, T Okusawa, R Oliveira, J Olsen, C Pagliarone, R Paoletti, V Papadimitriou, SP Pappas, N Parashar, S Park, A Parri, J Patrick, G Pauletta, M Paulini, A Perazzo, L Pescara, MD Peters, TJ Phillips, G Piacentino, M Pillai, KT Pitts, R Plunkett, L Pondrom, J Proudfoot, F Ptohos, G Punzi, K Ragan, D Reher, A Ribon, F Rimondi, L Ristori, WJ Robertson, T Rodrigo, S Rolli, J Romano, L Rosenson, R Roser, T Saab, WK Sakumoto, D Saltzberg, A Sansoni, L Santi, H Sato, P Schlabach, EE Schmidt, MP Schmidt, A Scribano, S Segler, S Seidel, Y Seiya, G Sganos, MD Shapiro, NM Shaw, Q Shen, PF Shepard, M Shimojima, M Shochet, J Siegrist, A Sill, P Sinervo, P Singh, J Skarha, K Sliwa, FD Snider, T Song, J Spalding, T Speer, P Sphicas, F Spinella, M Spiropulu, L Spiegel, L Stanco, J Steele, A Stefanini, K Strahl, J Strait, R Ströhmer, D Stuart, G Sullivan, K Sumorok, J Suzuki, T Takada, T Takahashi, T Takano, K Takikawa, N Tamura, B Tannenbaum, F Tartarelli, W Taylor, PK Teng, Y Teramoto, S Tether, D Theriot, TL Thomas, R Thun, R Thurman-Keup, M Timko, P Tipton, A Titov, S Tkaczyk, D Toback, K Tollefson, A Tollestrup, H Toyoda, W Trischuk, JF de Troconiz, S Truitt, J Tseng, N Turini, T Uchida, N Uemura, F Ukegawa, G Unal, J Valls, SC van den Brink, S Vejcik, G Velev, R Vidal, R Vilar, M Vondracek, D Vucinic, RG Wagner, RL Wagner, J Wahl, NB Wallace, AM Walsh, C Wang, CH Wang, J Wang, MJ Wang, QF Wang, A Warburton, T Watts, R Webb, C Wei, H Wenzel, WC Wester, AB Wicklund, E Wicklund, R Wilkinson, HH Williams, P Wilson, BL Winer, D Winn, D Wolinski, J Wolinski, S Worm, X Wu, J Wyss, A Yagil, W Yao, K Yasuoka, Y Ye, GP Yeh, P Yeh, M Yin, J Yoh, C Yosef, T Yoshida, D Yovanovitch, I Yu, L Yu, JC Yun, A Zanetti, F Zetti, L Zhang, W Zhang, S Zucchelli
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D∗ production in deep inelastic scattering at HERA

Physics Letters B Elsevier 407:3-4 (1997) 402-418

Authors:

ZEUS Collaboration, J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, RL Talaga, R Yoshida, H Zhang, MCK Mattingly, 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, M Corradi, S De Pasquale, I Gialas, 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, L Feld, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, H-P Jakob, UF Katz, E Paul, M Pfeiffer, Ch Rembser, J Stamm, R Wedemeyer, DS Bailey, S Campbell-Robson, WN Cottingham, B Foster, R Hall-Wilton, ME Hayes, GP Heath, HF Heath, D Piccioni, DG Roff, RJ Tapper, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, JY Kim, JH Lee, IT Lim, MY Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, JA Parsons, S Ritz, S Sampson, F Sciulli, PB Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, Z Jakubowski, MB Przybycień, M Zachara, L Zawiejski, L Adamczyk, B Bednarek, K Jeleń, D Kisielewska, T Kowalski, M Przybycień, E Rulikowska-Zarȩbska, L Suszycki, J Zaja̧c, Z Duliński, A Kotański, G Abbiendi, LAT Bauerdick, U Behrens, H Beier, JK Bienlein, G Cases, O Deppe, K Desler, G Drews, U Fricke, DJ Gilkinson, C Glasman, P Göttlicher, J Große-Knetter, T Haas, W Hain, D Hasell, KF Johnson, M Kasemann, W Koch, U Kötz, H Kowalski, J Labs, L Lindemann, B Löhr, M Löwe, O Mańczak, J Milewski, T Monteiro, JST Ng, D Notz, K Ohrenberg, IH Park, A Pellegrino, F Pelucchi, K Piotrzkowski, M Roco, M Rohde, J Roldán, JJ Ryan, AA Savin, U Schneekloth, F Selonke, B Surrow, E Tassi, T Voß, D Westphal, G Wolf, U Wollmer, C Youngman, AF Ż.arnecki, W Zeuner, BD Burow, HJ Grabosch, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Maccarrone, L Votano, A Bamberger, S Eisenhardt, P Markun, T Trefzger, S Wölfle, JT Bromley, NH Brook, PJ Bussey, AT Doyle, DH Saxon, LE Sinclair, E Strickland, ML Utley, R Waugh, AS Wilson, I Bohnet, N Gendner, U Holm, A Meyer-Larsen, H Salehi, K Wick, LK Gladilin, D Horstmann, D Kçira, R Klanner, E Lohrmann, G Poelz, W Schott, F Zetsche, TC Bacon, I Butterworth, JE Cole, VL Harris, G Howell, BHY Hung, L Lamberti, KR Long, DB Miller, N Pavel, A Prinias, JK Sedgbeer, D Sideris, AF Whitfield, U Mallik, SM Wang, JT Wu, P Cloth, D Filges, JI Fleck, T Ishii, M Kuze, M Nakao, K Tokushuku, S Yamada, Y Yamazaki, SH An, SB Lee, SW Nam, HS Park, SK Park, F Barreiro, JP Fernández, G García, R Graciani, JM Hernández, L Hervás, L Labarga, M Martínez, J del Peso, J Puga, J Terrón, JF de Trocóniz, F Corriveau, DS Hanna, J Hartmann, LW Hung, JN Lim, WN Murray, A Ochs, M Riveline, DG Stairs, M St-Laurent, R Ullmann, T Tsurugai, V Bashkirov, BA Dolgoshein, A Stifutkin, GL Bashindzhagyan, PF Ermolov, Yu A Golubkov, LA Khein, NA Korotkova, IA Korzhavina, VA Kuzmin, O Yu Lukina, AS Proskuryakov, LM Shcheglova, AV Shumilin, AN Solomin, SA Zotkin, C Bokel, M Botje, N Brümmer, F Chlebana, J Engelen, P Kooijman, A Kruse, A van Sighem, H Tiecke, W Verkerke, J Vossebeld, M Vreeswijk, 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, N Harnew, M Lancaster, JD McFall, C Nath, VA Noyes, A Quadt, O Ruske, JR Tickner, H Uijterwaal, 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, J Bulmahn, RG Feild, BY Oh, JR Okrasiński, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, M Raso, JC Hart, NA McCubbin, TP Shah, E Barberis, T Dubbs, C Heusch, M Van Hook, W Lockman, JT Rahn, HF-W Sadrozinski, A Seiden, DC Williams, O Schwarzer, AH Walenta, H Abramowicz, G Briskin, S Dagan, T Doeker, S Kananov, A Levy, T Abe, T Fusayasu, M Inuzuka, K Nagano, I Suzuki, K Umemori, T Yamashita, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, K Yamauchi, R Cirio, M Costa, MI Ferrero, S Maselli, V Monaco, C Peroni, MC Petrucci, R Sacchi, A Solano, A Staiano, M Dardo, DC Bailey, M Brkic, C-P Fagerstroem, GF Hartner, KK Joo, GM Levman, JF Martin, RS Orr, S Polenz, CR Sampson, D Simmons, RJ Teuscher, JM Butterworth, CD Catterall, TW Jones, PB Kaziewicz, JB Lane, RL Saunders, J Shulman, MR Sutton, B Lu, LW Mo, J Ciborowski, G Grzelak, M Kasprzak, K Muchorowski, RJ Nowak, JM Pawlak, R Pawlak, T Tymieniecka, AK Wróblewski, JA Zakrzewski, M Adamus, C Coldewey, Y Eisenberg, D Hochman, U Karshon, D Revel, WF Badgett, D Chapin, R Cross, S Dasu, C Foudas, RJ Loveless, S Mattingly, DD Reeder, WH Smith, A Vaiciulis, M Wodarczyk, S Bhadra, WR Frisken, M Khakzad, WB Schmidke

Abstract:

This paper presents measurements of D∗± production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with the ZEUS detector at HERA. The decay channel D∗+ → (D0 → K−π+)π+ (+c.c) has been used in the study. The e+p cross section for inclusive D∗± production with 5 < Q2 < 100 GeV2> and y < 0.7 is 5.3 ± 1.0 ± 0.8 nb in the kinematic region 1.3 < pT(D∗±) < 9.0 GeV and |η(D∗±)| < 1.5. Differential cross sections as functions of pT(D∗±), η(D∗±), W and Q2 are compared with next-to-leading order QCD calculations based on the photon-gluon fusion production mechanism. After an extrapolation of the cross section to the full kinematic region in pT(D∗±) and η(D∗±), the charm contribution F2cc̄(x, Q2) to the proton structure function is determined for Bjorken x between 2 · 10−4 and 5 · 10−3.
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Measurement of the proton structure function F2 and σtotγ∗p at low Q2 and very low x at HERA

Physics Letters B Elsevier 407:3-4 (1997) 432-448

Authors:

ZEUS Collaboration, J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, RL Talaga, R Yoshida, H Zhang, MCK Mattingly, 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, M Corradi, S De Pasquale, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, F Ricci, 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, H-P Jakob, UF Katz, R Kerger, E Paul, M Pfeiffer, Ch Rembser, J Stamm, R Wedemeyer, H Wieber, DS Bailey, S Campbell-Robson, WN Cottingham, B Foster, R Hall-Wilton, ME Hayes, GP Heath, HF Heath, D Piccioni, DG Roff, RJ Tapper, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, JY Kim, JH Lee, IT Lim, MY Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, JA Parsons, S Ritz, S Sampson, F Sciulli, PB Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, Z Jakubowski, MB Przybycień, M Zachara, L Zawiejski, L Adamczyk, B Bednarek, K Jeleń, D Kisielewska, T Kowalski, M Przybycień, E Rulikowska-Zarȩbska, L Suszycki, J Zaja̧c, Z Duliński, A Kotański, G Abbiendi, LAT Bauerdick, U Behrens, H Beier, JK Bienlein, G Cases, O Deppe, K Desler, G Drews, U Fricke, DJ Gilkinson, C Glasman, P Göttlicher, J Große-Knetter, T Haas, W Hain, D Hasell, KF Johnson, M Kasemann, W Koch, U Kötz, H Kowalski, J Labs, L Lindemann, B Löhr, M Löwe, O Mańczak, J Milewski, T Monteiro, JST Ng, D Notz, K Ohrenberg, IH Park, A Pellegrino, F Pelucchi, K Piotrzkowski, M Roco, M Rohde, J Roldán, JJ Ryan, AA Savin, U Schneekloth, F Selonke, B Surrow, E Tassi, T Voß, D Westphal, G Wolf, U Wollmer, C Youngman, AF Żarnecki, W Zeuner, BD Burow, HJ Grabosch, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Maccarrone, L Votano, A Bamberger, S Eisenhardt, P Markun, T Trefzger, S Wölfle, JT Bromley, NH Brook, PJ Bussey, AT Doyle, DH Saxon, LE Sinclair, E Strickland, ML Utley, R Waugh, AS Wilson, I Bohnet, N Gendner, U Holm, A Meyer-Larsen, H Salehi, K Wick, LK Gladilin, D Horstmann, D Kçira, R Klanner, E Lohrmann, G Poelz, W Schott, F Zetsche, TC Bacon, I Butterworth, JE Cole, VL Harris, G Howell, BHY Hung, L Lamberti, KR Long, DB Miller, N Pavel, A Prinias, JK Sedgbeer, D Sideris, AF Whitfield, U Mallik, SM Wang, JT Wu, P Cloth, D Filges, JI Fleck, T Ishii, M Kuze, M Nakao, K Tokushuku, S Yamada, Y Yamazaki, SH An, SB Lee, SW Nam, HS Park, SK Park, F Barreiro, JP Fernández, G García, R Graciani, JM Hernández, L Hervás, L Labarga, M Martínez, J del Peso, J Puga, J Terrón, JF de Trocóniz, F Corriveau, DS Hanna, J Hartmann, LW Hung, JN Lim, WN Murray, A Ochs, M Riveline, DG Stairs, M St-Laurent, R Ullmann, T Tsurugai, V Bashkirov, BA Dolgoshein, A Stifutkin, GL Bashindzhagyan, PF Ermolov, Yu A Golubkov, LA Khein, NA Korotkova, IA Korzhavina, VA Kuzmin, O Yu Lukina, AS Proskuryakov, LM Shcheglova, AN Solomin, SA Zotkin, C Bokel, M Botje, N Brümmer, F Chlebana, J Engelen, P Kooijman, A van Sighem, H Tiecke, N Tuning, W Verkerke, J Vossebeld, M Vreeswijk, 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, N Harnew, M Lancaster, JD McFall, C Nath, VA Noyes, A Quadt, O Ruske, JR Tickner, H Uijterwaal, 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, J Bulmahn, RG Feild, BY Oh, JR Okrasiński, 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, HF-W Sadrozinski, A Seiden, DC Williams, O Schwarzer, AH Walenta, H Abramowicz, G Briskin, S Dagan, T Doeker, S Kananov, A Levy, T Abe, T Fusayasu, M Inuzuka, K Nagano, I Suzuki, K Umemori, T Yamashita, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, K Yamauchi, R Cirio, M Costa, MI Ferrero, S Maselli, V Monaco, C Peroni, MC Petrucci, R Sacchi, A Solano, A Staiano, M Dardo, DC Bailey, M Brkic, C-P Fagerstroem, GF Hartner, KK Joo, GM Levman, JF Martin, RS Orr, S Polenz, CR Sampson, D Simmons, RJ Teuscher, JM Butterworth, CD Catterall, TW Jones, PB Kaziewicz, JB Lane, RL Saunders, J Shulman, MR Sutton, B Lu, LW Mo, J Ciborowski, G Grzelak, M Kasprzak, K Muchorowski, RJ Nowak, JM Pawlak, R Pawlak, T Tymieniecka, AK Wróblewski, JA Zakrzewski, M Adamus, C Coldewey, Y Eisenberg, D Hochman, U Karshon, D Revel, WF Badgett, D Chapin, R Cross, S Dasu, C Foudas, RJ Loveless, S Mattingly, DD Reeder, WH Smith, A Vaiciulis, M Wodarczyk, S Bhadra, WR Frisken, M Khakzad, WB Schmidke

Abstract:

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q2 inelastic neutral current scattering, e+p → e+X, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton (γ∗p) cross-section is presented for 0.11 ≤ Q2 ≤ 0.65 GeV2 and 2 × 10−6 ≤ x ≤ 6 × 10−5, corresponding to a range in the γ∗p c.m. energy of 100 ≤ W ≤ 230 GeV. Comparisons with various models are also presented.
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Study of photon dissociation in diffractive photoproduction at HERA

Zeitschrift für Physik C Particles and Fields Springer Nature 75:3 (1997) 421-435
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