Kinematic Evidence for Top Quark Pair Production in $W+$ Multijet Events in $p \bar p$ Collisions at $\sqrt{s}$~=~1.8 TeV

ArXiv hep-ex/9412009 (1994)

Comparison of energy flows in deep inelastic scattering events with and without a large rapidity gap

Physics Letters B 338:4 (1994) 483-496

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, A Polini, 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, M Grothe, H Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, UF Katz, SM Mari, 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, L Iannotti, M Schioppa, G Susinno, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, P Borzemski

Abstract:

Energy flows in deep inelastic electron-proton scattering are investigated at a centre-of-mass energy of 269 GeV for the range Q2 ≥ 10 GeV2 using the ZEUS detector. A comparison is made between events with and without a large rapidity gap between the hadronic system and the proton direction. The energy flows, corrected for detector acceptance and resolution, are shown for these two classes of events in both the HERA laboratory frame and the Breit frame. From the differences in the shapes of these energy flows we conclude that QCD radiation is suppressed in the large-rapidity-gap eents compared to the events without a large rapidity gap. © 1994.

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.