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Measurement of the cross section for γγ→pp¯

Physical Review D American Physical Society (APS) 50:9 (1994) 5484-5490

Authors:

M Artuso, D He, M Goldberg, N Horwitz, R Kennett, GC Moneti, F Muheim, Y Mukhin, S Playfer, Y Rozen, S Stone, M Thulasidas, G Vasseur, G Zhu, J Bartelt, SE Csorna, Z Egyed, V Jain, P Sheldon, DS Akerib, B Barish, M Chadha, S Chan, DF Cowen, G Eigen, JS Miller, C O’Grady, J Urheim, AJ Weinstein, D Acosta, M Athanas, G Masek, H Paar, M Sivertz, A Bean, J Gronberg, R Kutschke, S Menary, RJ Morrison, S Nakanishi, HN Nelson, TK Nelson, JD Richman, A Ryd, H Tajima, D Schmidt, D Sperka, MS Witherell, M Procario, S Yang, R Balest, K Cho, M Daoudi, WT Ford, DR Johnson, K Lingel, M Lohner, P Rankin, JG Smith, JP Alexander, C Bebek, K Berkelman, D Besson, TE Browder, DG Cassel, HA Cho, DM Coffman, PS Drell, R Ehrlich, RS Galik, M Garcia-Sciveres, B Geiser, B Gittelman, SW Gray, DL Hartill, BK Heltsley, CD Jones, SL Jones, J Kandaswamy, N Katayama, PC Kim, DL Kreinick, GS Ludwig, J Masui, J Mevissen, NB Mistry, CR Ng, E Nordberg, M Ogg, JR Patterson, D Peterson, D Riley, S Salman, M Sapper, H Worden, F Würthwein, P Avery, A Freyberger, J Rodriguez, R Stephens, J Yelton, D Cinabro, S Henderson, K Kinoshita, T Liu, M Saulnier, F Shen, R Wilson, H Yamamoto, B Ong, M Selen, AJ Sadoff, R Ammar, S Ball, P Baringer, D Coppage, N Copty, R Davis, N Hancock, M Kelly, N Kwak, H Lam, Y Kubota, M Lattery, JK Nelson, S Patton, D Perticone, R Poling, V Savinov, S Schrenk, R Wang, MS Alam, IJ Kim, B Nemati, JJ O’Neill, H Severini, CR Sun, MM Zoeller, G Crawford, CM Daubenmier, R Fulton, D Fujino, KK Gan, K Honscheid, H Kagan, R Kass, J Lee, R Malchow, F Morrow, Y Skovpen, M Sung, C White, J Whitmore, P Wilson, F Butler, X Fu, G Kalbfleisch, M Lambrecht, WR Ross, P Skubic, J Snow, PL Wang, M Wood, D Bortoletto, DN Brown, J Fast, RL McIlwain, T Miao, DH Miller, M Modesitt, SF Schaffner, EI Shibata, IPJ Shipsey, PN Wang, M Battle, J Ernst, H Kroha, S Roberts, K Sparks, EH Thorndike, CH Wang, J Dominick, S Sanghera, V Shelkov, T Skwarnicki, R Stroynowski, I Volobouev, P Zadorozhny

Measurement of two-photon production of the χc2

Physical Review D American Physical Society (APS) 50:7 (1994) 4265-4271

Authors:

J Dominick, S Sanghera, V Shelkov, T Skwarnicki, R Stroynowski, I Volobouev, P Zadorozhny, M Artuso, D He, M Goldberg, N Horwitz, R Kennett, GC Moneti, F Muheim, Y Mukhin, S Playfer, Y Rozen, S Stone, M Thulasidas, G Vasseur, G Zhu, J Bartelt, SE Csorna, Z Egyed, V Jain, P Sheldon, DS Akerib, B Barish, M Chadha, S Chan, DF Cowen, G Eigen, JS Miller, C O’Grady, J Urheim, AJ Weinstein, D Acosta, M Athanas, G Masek, H Paar, M Sivertz, A Bean, J Gronberg, R Kutschke, S Menary, RJ Morrison, S Nakanishi, HN Nelson, TK Nelson, JD Richman, A Ryd, H Tajima, D Schmidt, D Sperka, MS Witherell, M Procario, S Yang, R Balest, K Cho, M Daoudi, WT Ford, DR Johnson, K Lingel, M Lohner, P Rankin, JG Smith, JP Alexander, C Bebek, K Berkelman, D Besson, TE Browder, DG Cassel, HA Cho, DM Coffman, PS Drell, R Ehrlich, RS Galik, M Garcia-Sciveres, B Geiser, B Gittelman, SW Gray, DL Hartill, BK Heltsley, CD Jones, SL Jones, J Kandaswamy, N Katayama, PC Kim, DL Kreinick, GS Ludwig, J Masui, J Mevissen, NB Mistry, CR Ng, E Nordberg, M Ogg, JR Patterson, D Peterson, D Riley, S Salman, M Sapper, H Worden, F Würthwein, P Avery, A Freyberger, J Rodriguez, R Stephens, J Yelton, D Cinabro, S Henderson, K Kinoshita, T Liu, M Saulnier, F Shen, R Wilson, H Yamamoto, B Ong, M Selen, AJ Sadoff, R Ammar, S Ball, P Baringer, D Coppage, N Copty, R Davis, N Hancock, M Kelly, N Kwak, H Lam, Y Kubota, M Lattery, JK Nelson, S Patton, D Perticone, R Poling, V Savinov, S Schrenk, R Wang, MS Alam, IJ Kim, B Nemati, JJ O’Neill, H Severini, CR Sun, MM Zoeller, G Crawford, M Daubenmeir, R Fulton, D Fujino, KK Gan, K Honscheid, H Kagan, R Kass, J Lee, R Malchow, F Morrow, Y Skovpen, M Sung, C White, J Whitmore, P Wilson, F Butler, X Fu, G Kalbfleisch, M Lambrecht, WR Ross, P Skubic, J Snow, PL Wang, M Wood, D Bortoletto, DN Brown, J Fast, RL McIlwain, T Miao, DH Miller, M Modesitt, SF Schaffner, EI Shibata, IPJ Shipsey, PN Wang, M Battle, J Ernst, H Kroha, S Roberts, K Sparks, EH Thorndike, CH Wang

Measurement of total and partial photon proton cross sections at 180 GeV center of mass energy

Zeitschrift Fur Physik C Particles and Fields 63:3 (1994) 391-408

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, J Schlereth, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, GC Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, F Ciralli, A Contin, S D'Auria, C Del Papa, F Frasconi, P Giusti, G Iacobucci, G Laurenti, G Levi, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, Y Zamora Garcia, A Zichichi, A Bargende, J Crittenden, K Desch, B Diekmann, T Doeker, L Feld, A Frey, M Geerts, G Geitz, H Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, UF Katz, S Kramarczyk, A Mass, S Mengel, J Mollen, E Paul, C Rembser, R Schattevoy, JL Schneider, D Schramm, R Wedemeyer, A Cassidy, DG Cussans, N Dyce, B Foster, S George, R Gilmore, GP Heath, HF Heath, M Lancaster, TJ Llewellyn, CJS Morgado, JA O'Mara, RJ Tapper, SS Wilson, R Yoshida, RR Rau, M Arneodo, M Schioppa, G Susinno, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, P Borzemski, J Chwastowski, A Eskreys, K Piotrzkowski, M Zachara

Abstract:

Photon proton cross sections for elastic light vector meson production, σelν±è, inelastic diffractive production, σndν±è, non-diffractive production, σdν±è, as well as the total cross section, σtotν±è, have been measured at an average Ï…p center of mass energy of 180 GeV with the ZEUS detector at HERA. The resulting values are σelν±è = 18 ± 7 μb, σdν±è = 33 ± 8 μb, σndν±è = 91 ± 11 μb, and σtotν±è 143 ± 17 μb, where the errors include statistical and systematic errors added in quadrature. © 1994 Springer-Verlag.

Characteristics of a 'HARP' signal processor with analog memory operated with segmented silicon detectors

IEEE Transactions on Nuclear Science Institute of Electrical and Electronics Engineers (IEEE) 41:4 (1994) 1130-1134

Authors:

F Anghinolfi, P Aspell, R Bonino, K Borer, D Campbell, M Campbell, AG Clark, C Gossling, P Jarron, EHM Heijne, H Kambara, B Lisowski, GF Moorhead, P Murray, JC Santiard, GN Taylor, J Teiger, H Verweij, A Weidberg, X Wu

Observation of jet production in deep inelastic scattering with a large rapidity gap at HERA

Physics Letters B 332:1-2 (1994) 228-243

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, J Schlereth, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, GC Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, F Ciralli, A Contin, S D'Auria, C Del Papa, F Frasconi, P Giusti, G Iacobucci, G Laurenti, G Levi, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, YZ Garcia, A Zichichi, A Bargende, J Crittenden, K Desch, B Diekmann, T Doeker, L Feld, A Frey, M Geerts, G Geitz, H Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, UF Katz, S Kramarczyk, A Mass, S Mengel, J Mollen, E Paul, C Rembser, R Schattevoy, JL Schneider, D Schramm, J Stamm, R Wedemeyer, S Campbell-Robson, A Cassidy, N Dyce, B Foster, S George, R Gilmore, GP Heath, HF Heath, TJ Llewellyn, CJS Morgado, DJP Norman, JA O'Mara, RJ Tapper, SS Wilson, R Yoshida, RR Rau, M Arneodo, M Schioppa, G Susinno, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, P Borzemski, J Chwastowski, A Eskreys, K Piotrzkowski

Abstract:

Events with a large rapidity gap in deep inelastic scattering with Q2 ≥ 10 GeV2 have been studied in the ZEUS detector. The properties of these events with W > 140 GeV are consistent with a leading twist diffractive production mechanism. In the laboratory frame, with ETjet ≥ 4 GeV, 15% of the events are of the 1-jet type with negligible 2-jet production. The single jet is back-to-back in azimuth with the scattered electron. No energy flow is observed between the jet and the proton direction. With a lower jet transverse energy cut 2-jet production is observed both in the laboratory and the γ* p centre-of-mass systems, demonstrating the presence of hard scattering in the virtual photon proton interactions that give rise to large rapidity gap events. © 1994.