OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION EVENTS WITH A LARGE RAPIDITY GAP AT HERA

PHYSICS LETTERS B 346:3-4 (1995) 399-414

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 DAURIA, F FRASCONI, I GIALAS, P GIUSTI, G IACOBUCCI, G LAURENTI, G LEVI, 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, M ECKERT, 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, D SCHRAMM, J STAMM, R WEDEMEYER, S CAMPBELLROBSON, A CASSIDY, N DYCE, B FOSTER, S GEORGE, R GILMORE, GP HEATH, HF HEATH, TJ LLEWELLYN, CJS MORGADO, DJP NORMAN, JA OMARA, RJ TAPPER, SS WILSON, R YOSHIDA, RR RAU, M ARNEODO, L IANNOTTI, M SCHIOPPA, G SUSINNO, A BERNSTEIN, A CALDWELL, JA PARSONS, S RITZ, F SCIULLI, PB STRAUB, L WAI, S YANG, Q ZHU, P BORZEMSKI, J CHWASTOWSKI, A ESKREYS, K PIOTRZKOWSKI, M ZACHARA, L ZAWIEJSKI, L ADAMCZYK, B BEDNAREK, K ESKREYS, K JELEN, D KISIELEWSKA, T KOWALSKI, E RULIKOWSKAZAREBSKA, L SUSZYCKI, J ZAJAC, A KOTANSKI, M PRZYBYCIEN, LAT BAUERDICK, U BEHRENS, JK BIENLEIN, S BOTTCHER, C COLDEWEY, G DREWS, M FLASINSKI, DJ GILKINSON, P GOTTLICHER, B GUTJAHR, T HAAS, W HAIN, D HASELL, H HESSLING, H HULTSCHIG, Y IGA, P JOOS, M KASEMANN, R KLANNER, W KOCH, L KOPKE, U KOTZ, H KOWALSKI, W KROGER, J KRUGER, J LABS, A LADAGE, B LOHR, M LOWE, D LUKE, O MANCZAK, JST NG, S NICKEL, D NOTZ, K OHRENBERG, M ROCO, M ROHDE, J ROLDAN, U SCHNEEKLOTH, W SCHULZ, F SELONKE, E STILIARIS, T VOSS, D WESTPHAL, G WOLF, C YOUNGMAN, HJ GRABOSCH, A LEICH, A MEYER, C RETHFELDT, S SCHLENSTEDT, G BARBAGLI, P PELFER, G ANZIVINO, G MACCARRONE, S DEPASQUALE, S QIAN, L VOTANO, A BAMBERGER, A FREIDHOF, T POSER, S SOLDNERREMBOLD, J SCHROEDER, G THEISEN, T TREFZGER, NH BROOK, PJ BUSSEY, AT DOYLE, I FLECK, VA JAMIESON, DH SAXON, ML UTLEY, AS WILSON, A DANNEMANN, U HOLM, D HORSTMANN, H KAMMERLOCHER, B KREBS, T NEUMANN, R SINKUS, K WICK, E BADURA, BD BUROW, A FURTJES, L HAGGE, E LOHRMANN, J MAINUSCH, J MILEWSKI, M NAKAHATA, N PAVEL, G POELZ, W SCHOTT, J TERRON, F ZETSCHE, TC BACON, R BEUSELINCK, I BUTTERWORTH, E GALLO, VL HARRIS, BH HUNG, KR LONG, DB MILLER, PPO MORAWITZ, A PRINIAS, JK SEDGBEER, AF WHITFIELD, U MALLIK, E MCCLIMENT, MZ WANG, SM WANG, JT WU, Y ZHANG, P CLOTH, D FILGES, SH AN, SM HONG, SW NAM, SK PARK, MH SUH, SH YON, R IMLAY, S KARTIK, HJ KIM, RR MCNEIL, W METCALF, VK NADENDLA, F BARREIRO, G CASES, R GRACIANI, JM HERNANDEZ, L HERVAS, L LABARGA, J DELPESO, J PUGA, JF DETROCONIZ, GR SMITH, F CORRIVEAU, DS HANNA, J HARTMANN, LW HUNG, JN LIM, CG MATTHEWS, PM PATEL, LE SINCLAIR, DG STAIRS, M STLAURENT, R ULLMANN, G ZACEK, V BASHIROV, BA DOLGOSHEIN, A STIFUTKIN, GL BASHINDZHAGYAN, PF ERMOLOV, LK GLADILIN, YA GOLUBKOV, VD KOBRIN, VA KUZMIN, AS PROSKURYAKOV, AA SAVIN, LM SHCHEGLOVA, AN SOLOMIN, NP ZOTOV, S BENTVELSEN, M BOTJE, F CHLEBANA, A DAKE, J ENGELEN, P DEJONG, M DEKAMPS, P KOOIJMAN, A KRUSE, V ODELL, A TENNER, H TIECKE, W VERKERKE, M VREESWIJK, L WIGGERS, E DEWOLF, R VANWOUDENBERG, D ACOSTA, B BYLSMA, LS DURKIN, K HONSCHEID, C LI, TY LING, KW MCLEAN, WN MURRAY, IH PARK, TA ROMANOWSKI, R SEIDLEIN, DS BAILEY, GA BLAIR, A BYRNE, RJ CASHMORE, AM COOPERSARKAR, D DANIELS, RCE DEVENISH, N HARNEW, M LANCASTER, PE LUFFMAN, L LINDEMANN, J MCFALL, C NATH, A QUADT, H UIJTERWAAL, R WALCZAK, FF WILSON, T YIP, G ABBIENDI, A BERTOLIN, R BRUGNERA, R CARLIN, F DALCORSO, M DEGIORGI, U DOSSELLI, S LIMENTANI, M MORANDIN, M POSOCCO, L STANCO, R STROILI, C VOCI, J BULMAHN, JM BUTTERWORTH, RG FEILD, BY OH, JJ WHITMORE, G DAGOSTINI, M IORI, G MARINI, M MATTIOLI, A NIGRO, E TASSI, JC HART, NA MCCUBBIN, K PRYTZ, TP SHAH, TL SHORT, E BARBERIS, N CARTIGLIA, T DUBBS, C HEUSCH, M VANHOOK, B HUBBARD, W LOCKMAN, JT RAHN, HFW SADROZINSKI, A SEIDEN, J BILTZINGER, RJ SEIFERT, AH WALENTA, G ZECH, H ABRAMOWICZ, G BRISKIN, S DAGAN, A LEVY, T HASEGAWA, M HAZUMI, T ISHII, M KUZE, S MINE, Y NAGASAWA, T NAGIRA, M NAKAO, I SUZUKI, K TOKUSHUKU, S YAMADA, Y YAMAZAKI, M CHIBA, R HAMATSU, T HIROSE, K HOMMA, S KITAMURA, S NAGAYAMA, Y NAKAMITSU, R CIRIO, M COSTA, MI FERRERO, L LAMBERTI, S MASELLI, C PERONI, R SACCHI, A SOLANO, A STAIANO, M DARDO, DC BAILEY, D BANDYOPADHYAY, F BENARD, M BRKIC, MB CROMBIE, DM GINGRICH, GE HARTNER, KK JOO, GM LEVMAN, JF MARTIN, RS ORR, CR SAMPSON, RJ TEUSCHER, CD CATTERALL, TW JONES, PB KAZIEWICZ, JB LANE, RL SAUNDERS, J SHULMAN, K BLANKENSHIP, J KOCHOCKI, B LU, LW MO, W BOGUSZ, K CHARCHULA, J CIBOROWSKI, J GAJEWSKI, G GRZELAK, M KASPRZAK, M KRZYZANOWSKI, K MUCHOROWSKI, RJ NOWAK, JM PAWLAK, T TYMIENIECKA, AK WROBLEWSKI, JA ZAKRZEWSKI, AF ZARNECKI, M ADAMUS, Y EISENBERG, C GLASMAN, U KARSHON, D REVEL, A SHAPIRA, I ALI, B BEHRENS, S DASU, C FORDHAM, C FOUDAS, A GOUSSIOU, RJ LOVELESS, DD REEDER, S SILVERSTEIN, WH SMITH, T TSURUGAI, S BHADRA, WR FRISKEN, KM FURUTANI

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)

Precision Measurement of the Prompt Photon Cross Section in pp¯ Collisions at s=1.8 TeV

Physical Review Letters American Physical Society (APS) 73:20 (1994) 2662-2666

Authors:

F Abe, MG Albrow, D Amidei, J Antos, C Anway-Wiese, G Apollinari, H Areti, M Atac, P Auchincloss, F Azfar, P Azzi, N Bacchetta, W Badgett, MW Bailey, J Bao, P de Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Bartalini, G Bauer, T Baumann, F Bedeschi, S Behrends, S Belforte, G Gellettini, J Bellinger, D Benjamin, J Benlloch, J Bensinger, D Benton, A Beretvas, JP Berge, S Bertolucci, A Bhatti, K Biery, M Binkley, F Bird, D Bisello, RE Blair, C Blocker, A Bodek, W Bokhari, V Bolognesi, D Bortoletto, C Boswell, T Boulos, G Brandenburg, 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, Y Cen, F Cervelli, J Chapman, MT Cheng, G Chiarelli, T Chikamatsu, S Cihangir, AG Clark, M Cobal, M Contreras, J Conway, J Cooper, M Cordelli, D Crane, JD Cunningham, T Daniels, F DeJongh, S Delchamps, S Dell'Agnello, M Dell'Orso, L Demortier, B Denby, M Deninno, PF Derwent, T Devlin, M Dickson, S Donati, RB Drucker, A Dunn, K Einsweiler, JE Elias, R Ely, E Engels, S Eno, D Errede, S Errede, Q Fan, B Farhat, I Fiori, B Flaugher, GW Foster, M Franklin, M Frautschi, J Freeman, J Friedman, H Frisch, A Fry, TA Fuess, Y Fukui, S Funaki, G Gagliardi, S Galeotti, M Gallinaro, AF Garfinkel, S Geer, DW Gerdes, P Giannetti, N Giokaris, P Giromini, L Gladney, D Glenzinski, M Gold, J Gonzalez, A Gordon, AT Goshaw, K Goulianos, H Grassmann, A Grewal, G Grieco, L Groer, C Grosso-Pilcher, C Haber, SR Hahn, R Hamilton, R Handler, RM Hans, K Hara, B Harral, RM Harris, SA Hauger, J Hauser, C Hawk, J Heinrich, D Cronin-Hennessy, R Hollebeek, L Holloway, A Hölscher, S Hong, G Houk, P Hu, BT Huffman, R Hughes, P Hurst, J Huston, J Huth, J Hylen, M Incagli, J Incandela, H Iso, H Jensen, CP Jessop, U Joshi, RW Kadel, E Kajfasz, T Kamon, T Kaneko, DA Kardelis, H Kasha, Y Kato, L Keeble, RD Kennedy, R Kephart, P Kesten, D Kestenbaum, RM Keup, H Keutelian, F Keyvan, DH Kim, HS Kim, SB Kim, SH Kim, YK Kim, L Kirsch, P Koehn, K Kondo, J Konigsberg, S Kopp, K Kordas, W Koska, E Kovacs, W Kowald, M Krasberg, J Kroll, M Kruse, SE Kuhlmann, E Kuns, AT Laasanen, S Lammel, JI Lamoureux, T LeCompte, S Leone, JD Lewis, P Limon, M Lindgren, TM Liss, N Lockyer, C Loomis, O Long, M Loreti, EH Low, J Lu, D Lucchesi, CB Luchini, P Lukens, P Maas, 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, G Michail, S Mikamo, M Miller, R Miller, T Mimashi, S Miscetti, M Mishina, H Mitsushio, S Miyashita, Y Morita, S Moulding, J Mueller, A Mukherjee, T Muller, P Musgrave, LF Nakae, I Nakano, C Nelson, D Neuberger, C Newman-Holmes, L Nodulman, S Ogawa, SH Oh, KE Ohl, R Oishi, T Okusawa, C Pagliarone, R Paoletti, V Papadimitriou, S Park, J Patrick, G Pauletta, M Paulini, L Pescara, MD Peters, TJ Phillips, G Piacentino, M Pillai, R Plunkett, L Pondrom, N Produit, J Proudfoot, F Ptohos, G Punzi, K Ragan, F Rimondi, L Ristori, M Roach-Bellino, WJ Robertson, T Rodrigo, J Romano, L Rosenson, WK Sakumoto, D Saltzberg, A Sansoni, V Scarpine, A Schindler, P Schlabach, EE Schmidt, MP Schmidt, O Schneider, GF Sciacca, A Scribano, S Segler, S Seidel, Y Seiya, G Sganos, A Sgolacchia, M Shapiro, NM Shaw, Q Shen, PF Shepard, M Shimojima, M Shochet, J Siegrist, A Sill, P Sinervo, P Singh, J Skarha, K Sliwa, DA Smith, FD Snider, L Song, T Song, J Spalding, L Spiegel, P Sphicas, A Spies, L Stanco, J Steele, A Stefanini, K Strahl, J Strait, D Stuart, G Sullivan, K Sumorok, RL Swartz, T Takahashi, K Takikawa, F Tartarelli, W Taylor, Y Teramoto, S Tether, D Theriot, J Thomas, TL Thomas, R Thun, M Timko, P Tipton, A Titov, S Tkaczyk, K Tollefson, A Tollestrup, J Tonnison, JF de Troconiz, J Tseng, M Turcotte, N Turini, N Uemura, F Ukegawa, G Unal, S van den Brink, S Vejcik, R Vidal, M Vondracek, RG Wagner, RL Wagner, N Wainer, RC Walker, G Wang, J Wang, MJ Wang, QF Wang, A Warburton, G Watts, T Watts, R Webb, C Wendt, H Wenzel, WC Wester, T Westhusing, AB Wicklund, E Wicklund, R Wilkinson, HH Williams, P Wilson, BL Winer, J Wolinski, DY Wu, X Wu, J Wyss, A Yagil, W Yao, K Yasuoka, Y Ye, GP Yeh, P Yeh, M Yin, J Yoh, T Yoshida, D Yovanovitch, I Yu, JC Yun, A Zanetti, F Zetti, L Zhang, S Zhang, W Zhang, S Zucchelli

Search for the Top Quark Decaying to a Charged Higgs Boson in p¯p Collisions at s=1.8 TeV

Physical Review Letters American Physical Society (APS) 73:20 (1994) 2667-2671

Authors:

F Abe, MG Albrow, D Amidei, J Antos, C Anway-Wiese, G Apollinari, H Areti, M Atac, P Auchincloss, F Azfar, P Azzi, N Bacchetta, W Badgett, MW Bailey, J Bao, P de Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Bartalini, 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, S Bertolucci, A Bhatti, K Biery, M Binkley, F Bird, D Bisello, RE Blair, C Blocker, A Bodek, V Bolognesi, D Bortoletto, C Boswell, T Boulos, G Brandenburg, 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, Y Cen, F Cervelli, J Chapman, M-T Cheng, G Chiarelli, T Chikamatsu, S Cihangir, AG Clark, M Cobal, M Contreras, J Conway, J Cooper, M Cordelli, D Crane, JD Cunningham, T Daniels, F DeJongh, S Delchamps, S Dell' Agnello, M Dell'Orso, L Demortier, B Denby, M Deninno, PF Derwent, T Devlin, M Dickson, S Donati, RB Drucker, A Dunn, K Einsweiler, JE Elias, R Ely, E Engels, S Eno, D Errede, S Errede, Q Fan, B Farhat, I Fiori, B Flaugher, GW Foster, M Franklin, M Frautschi, J Freeman, J Friedman, H Frisch, A Fry, TA Fuess, Y Fukui, S Funaki, G Gagliardi, S Galeotti, M Gallinaro, AF Garfinkel, S Geer, DW Gerdes, P Giannetti, N Giokaris, P Giromini, L Gladney, D Glenzinski, M Gold, J Gonzalez, A Gordon, AT Goshaw, K Goulianos, H Grassmann, A Grewal, G Grieco, L Groer, C Grosso-Pilcher, C Haber, SR Hahn, R Hamilton, R Handler, RM Hans, K Hara, B Harral, RM Harris, SA Hauger, J Hauser, C Hawk, J Heinrich, D Cronin-Hennessy, R Hollebeek, L Holloway, A Hölscher, S Hong, G Houk, P Hu, BT Huffman, R Hughes, P Hurst, J Huston, J Huth, J Hylen, M Incagli, J Incandela, H Iso, H Jensen, CP Jessop, U Joshi, RW Kadel, E Kajfasz, T Kamon, T Kaneko, DA Kardelis, H Kasha, Y Kato, L Keeble, RD Kennedy, R Kephart, P Kesten, D Kestenbaum, RM Keup, H Keutelian, F Keyvan, DH Kim, HS Kim, SB Kim, SH Kim, YK Kim, L Kirsch, P Koehn, K Kondo, J Konigsberg, S Kopp, K Kordas, W Koska, E Kovacs, W Kowald, M Krasberg, J Kroll, M Kruse, SE Kuhlmann, E Kuns, AT Laasanen, S Lammel, JI Lamoureux, T LeCompte, S Leone, JD Lewis, P Limon, M Lindgren, TM Liss, N Lockyer, O Long, C Loomis, M Loreti, EH Low, J Lu, D Lucchesi, CB Luchini, P Lukens, P Maas, 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, G Michail, S Mikamo, M Miller, R Miller, T Mimashi, S Miscetti, M Mishina, H Mitsushio, S Miyashita, Y Morita, S Moulding, J Mueller, A Mukherjee, T Muller, P Musgrave, LF Nakae, I Nakano, C Nelson, D Neuberger, C Newman-Holmes, L Nodulman, S Ogawa, SH Oh, KE Ohl, R Oishi, T Okusawa, C Pagliarone, R Paoletti, V Papadimitriou, S Park, J Patrick, G Pauletta, M Paulini, L Pescara, MD Peters, TJ Phillips, G Piacentino, M Pillai, R Plunkett, L Pondrom, N Produit, J Proudfoot, F Ptohos, G Punzi, K Ragan, F Rimondi, L Ristori, M Roach-Bellino, WJ Robertson, T Rodrigo, J Romano, L Rosenson, WK Sakumoto, D Saltzberg, A Sansoni, V Scarpine, A Schindler, P Schlabach, EE Schmidt, MP Schmidt, O Schneider, GF Sciacca, A Scribano, S Segler, S Seidel, Y Seiya, G Sganos, A Sgolacchia, M Shapiro, NM Shaw, Q Shen, PF Shepard, M Shimojima, M Shochet, J Siegrist, A Sill, P Sinervo, P Singh, J Skarha, K Sliwa, DA Smith, FD Snider, L Song, T Song, J Spalding, L Spiegel, P Sphicas, A Spies, L Stanco, J Steele, A Stefanini, K Strahl, J Strait, D Stuart, G Sullivan, K Sumorok, RL Swartz, T Takahashi, K Takikawa, F Tartarelli, W Taylor, Y Teramoto, S Tether, D Theriot, J Thomas, TL Thomas, R Thun, M Timko, P Tipton, A Titov, S Tkaczyk, K Tollefson, A Tollestrup, J Tonnison, JF de Troconiz, J Tseng, M Turcotte, N Turini, N Uemura, F Ukegawa, G Unal, S van den Brink, S Vejcik, R Vidal, M Vondracek, RG Wagner, RL Wagner, N Wainer, RC Walker, G Wang, J Wang, MJ Wang, QF Wang, A Warburton, G Watts, T Watts, R Webb, C Wendt, H Wenzel, WC Wester, T Westhusing, AB Wicklund, E Wicklund, R Wilkinson, HH Williams, P Wilson, BL Winer, J Wolinski, DY Wu, X Wu, J Wyss, A Yagil, W Yao, K Yasuoka, Y Ye, GP Yeh, P Yeh, M Yin, J Yoh, T Yoshida, D Yovanovitch, I Yu, JC Yun, A Zanetti, F Zetti, L Zhang, S Zhang, W Zhang, S Zucchelli

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.