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

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.

Precision measurement of the prompt photon cross section in pp-bar collisions at sqrt s =1.8 TeV.

Physical review letters 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, de Barbaro P, 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, 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

Search for the top quark decaying to a charged Higgs boson in p-barp collisions at sqrt s =1.8 TeV.

Physical review letters 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, de Barbaro P, 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 Cheng

W boson+jet angular distribution in pp-bar collisions at sqrt s =1.8 TeV.

Physical review letters 73:17 (1994) 2296-2300

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, de Barbaro P, 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, 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