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Search for (W)over-tilde(1)(Z)over-tilde(2) production via trilepton final states in p(p)over-bar collisions at root s=1.8 TeV

PHYSICAL REVIEW LETTERS 76:13 (1996) 2228-2233

Authors:

S Abachi, B Abbott, M Abolins, BS Acharya, I Adam, DL Adams, M Adams, S Ahn, H Aihara, J Alitti, G Alvarez, GA Alves, E Amidi, N Amos, EW Anderson, SH Aronson, R Astur, RE Avery, A Baden, V Balamurali, J Balderston, B Baldin, J Bantly, JF Bartlett, K Bazizi, J Bendich, SB Beri, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, A Bischoff, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, NI Bojko, F Borcherding, J Borders, C Boswell, A Brandt, R Brock, A Bross, D Buchholz, VS Burtovoi, JM Butler, W Carvalho, D Casey, H CastillaValdez, D Chakraborty, SM Chang, SV Chekulaev, LP Chen, W Chen, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, WE Cooper, C Cretsinger, D CullenVidal, MAC Cummings, D Cutts, OI Dahl, K De, M Demarteau, R Demina, K Denisenko, N Denisenko, D Denisov, SP Denisov, HT Diehl, M Diesburg, G DiLoreto, R Dixon, P Draper, J Drinkard, Y Ducros, SR Dugad, S DurstonJohnson, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, VN Evdokimov, S Fahey, T Fahland, H Fatyga, MK Fatyga, J Featherly, S Feher, D Fein, T Ferbel, G Finocchiaro, HE Fisk, Y Fisyak, E Flattum, GE Forden, M Fortner, KC Frame, P Franzini, S Fuess, E Gallas, AN Galyaev, TL Geld, RJ Genik, K Genser, CE Gerber, B Gibbard, V Glebov, S Glenn, JF Glicenstein, B Gobbi, M Goforth, A Goldschmidt, B Gomez, PI Goncharov, JLG Solis, H Gordon, LT Goss, N Graf, PD Grannis, DR Green, J Green, H Greenlee, G Griffin, N Grossman, P Grudberg, S Grunendahl, WX Gu, G Guglielmo, JA Guida, JM Guida, W Guryn, SN Gurzhiev, P Gutierrez, YE Gutnikov, NJ Hadley, H Haggerty, S Hagopian, V Hagopian, KS Hahn, RE Hall, S Hansen, R Hatcher, JM Hauptman, D Hedin, AP Heinson, U Heintz, R HernandezMontoya, T Heuring, R Hirosky, JD Hobbs, B Hoeneisen, JS Hoftun, F Hsieh, T Hu, T Hu, T Hu, T Huehn, S Igarashi, AS Ito, E James, J Jaques, SA Jerger, JZY Jiang, T JoffeMinor, H Johari, K Johns, M Johnson, H Johnstad, A Jonckheere, M Jones, H Jostlein, SY Jun, CK Jung, S Kahn, G Kalbfleisch, JS Kang, R Kehoe, ML Kelly, A Kernan, L Kerth, CL Kim, SK Kim, A Klatchko, B Klima, BI Klochkov, C Klopfenstein, VI Klyukhin, V Kochetkov, JM Kohli, D Koltick, A Kostritskiy, J Kotcher, J Kourlas, AV Kozelov, EA Kozlovski, MR Krishnaswamy, S Krzywdzinski, S Kunori, S Lami, G Landsberg, JF Lebrat, A Leflat, H Li, J Li, YK Li, QZ LiDemarteau, JGR Lima, D Lincoln, SL Linn, J Linnemann, R Lipton, YC Liu, F Lobkowicz, SC Loken, S Lokos, L Lueking, AL Lyon, AKA Maciel, RJ Madaras, R Madden, S Mani, HS Mao, S Margulies, R Markeloff, L Markosky, T Marshall, MI Martin, M Marx, B May, AA Mayorov, R McCarthy, T McKibben, J McKinley, T McMahon, HL Melanson, JRT deMelloNeto, KW Merritt, H Miettinen, A Mincer, JM deMiranda, CS Mishra, M MohommadiBaarmand, N Mokhov, NK Mondal, HE Montgomery, P Mooney, H daMotta, H Mudan, C Murphy, CT Murphy, F Nang, M Narain, VS Narasimham, A Narayanan, HA Neal, JP Negret, E Neis, P Nemethy, D Nesic, M Nicola, D Norman, L Oesch, V Oguri, E Oltman, N Oshima, D Owen, P Padley, M Pang, A Para, CH Park, YM Park, R Partridge, N Parua, M Paterno, J Perkins, A Peryshkin, M Peters, H Piekarz, Y Pischalnikov, VM Podstavkov, BG Pope, HB Prosper, S Protopopescu, D Puseljic, J Qian, PZ Quintas, R Raja, S Rajagopalan, O Ramirez, MVS Rao, PA Rapidis, L Rasmussen, AL Read, S Reucroft, M Rijssenbeek, T Rockwell, NA Roe, P Rubinov, R Ruchti, S Rusin, J Rutherfoord, A Santoro, L Sawyer, RD Schamberger, H Schellman, J Sculli, E Shabalina, C Shaffer, HC Shankar, YY Shao, RK Shivpuri, H Shupe, JB Singh, V Sirotenko, W Smart, A Smith, RP Smith, R Snihur, GR Snow, S Snyder, J Solomon, PM Sood, M Sosebee, M Souza, AL Spadafora, RW Stephens, ML Stevenson, D Stewart, DA Stoianova, D Stoker, K Streets, M Strovink, A Sznajder, A Taketani, P Tamburello, J Tarazi, M Tartaglia, TL Taylor, J Thompson, TG Trippe, PM Tuts, N Varelas, EW Varnes, PRG Virador, D Vititoe, AA Volkov, AP Vorobiev, HD Wahl, G Wang, J Warchol, H Wayne, H Weerts, F Wen, A White, JT White, JA Wightman, J Wilcox, S Willis, SJ Wimpenny, JVD Wirjawan, J Womersley, E Won, DR Wood, H Xu, R Yamada, P Yamin, C Yanagisawa, J Yang, T Yasuda, C Yoshikawa, S Youssef, J Yu, Y Yu, D Zhang, Q Zhu, ZH Zhu, D Zieminska, A Zieminski, A Zylberstejn
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ϒ Production in pp¯ Collisions at s=1.8 TeV

Physical Review Letters American Physical Society (APS) 75:24 (1995) 4358-4363

Authors:

F Abe, MG Albrow, SR Amendolia, 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, W Bokhari, V Bolognesi, D Bortoletto, C Boswell, T Boulos, G Brandenburg, C Bromberg, 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, HY Chao, J Chapman, M-T Cheng, G Chiarelli, T Chikamatsu, CN Chiou, L Christofek, S Cihangir, AG Clark, M Cobal, M Contreras, J Conway, J Cooper, M Cordelli, C Couyoumtzelis, 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, JR Dittmann, 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, 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, N Labanca, 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, J Lys, 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, SP Pappas, 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, 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, PK Teng, 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, SC van den Brink, S Vejcik, R Vidal, M Vondracek, D Vucinic, RG Wagner, RL Wagner, N Wainer, RC Walker, C Wang, CH Wang, G Wang, J Wang, MJ Wang, QF Wang, A Warburton, G Watts, T Watts, R Webb, C Wei, 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, C Yosef, T Yoshida, D Yovanovitch, I Yu, JC Yun, A Zanetti, F Zetti, L Zhang, S Zhang, W Zhang, S Zucchelli
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A search for excited fermions in electron-proton collisions at HERA

Zeitschrift Fur Physik C Particles and Fields 65:4 (1995) 627-647

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, 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 Eckart, 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, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, P Borzemski, J Chwastowski

Abstract:

A search for excited states of the standard model fermions was performed using the ZEUS detector at the HERA electron-proton collider, operating at a centre of mass energy of 296 GeV. In a sample corresponding to an integrated luminosity of 0.55 pb-1, no evidence was found for any resonant state decaying into final states composed of a fermion and a gauge boson. Limits on the coupling strength times branching ratio of excited fermions are presented for masses between 50 GeV and 250 GeV, extending previous search regions significantly. © 1995 Springer-Verlag.
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Measurement of elastic $\rho^0$ photoproduction at HERA

Zeitschrift f�r Physik C Particles and Fields Springer Science and Business Media LLC 69:1 (1995) 39-54
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Measurement of elastic ρ 0 photoproduction at HERA

Zeitschrift für Physik C: Particles and Fields 69:1 (1995) 39-54

Authors:

M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, RL Talaga, H Zhang, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, G Cara Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, A Contin, M Corradi, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, A Polini, G Sartorelli, T Timellini, Y Zamora Garcia, A Zichichi, B Bargende, A Bornheim, J Crittenden, K Desch, B Diekmann, T Doeker, M Eckert, L Feld, A Frey, M Geerts, M Grothe, H Hartmann, K Heinloth, E Hilger, HP Jakob, UF Katz, S Mengel, J Mollen, E Paul, M Pfeiffer, C Rembser, 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 Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, A Bernstein, A Caldwell, N Cartiglia, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, K Piotrzkowski, M Zachara

Abstract:

Elastic ρ 0 photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from ep interactions were used to measure the reaction γp→ρ 0 p(ρ 0)→π +π-) at photon-proton centre-of-mass energies between 60 and 80 GeV and |t|<0.5 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The differential cross section dσ/d M ππ where M ππ is the invariant mass of the two pions, and the integrated cross section, σγp→ρ{variant}0ρ{variant}, are presented; the latter was measured to be 14.7±0.4 (stat.) ±2.4 (syst.)μb. The differential cross section dσ/dt has an approximately exponential shape; a fit of the type A t ′ exp(-b t ′ |t|+c t ′ t 2) yields a t-slope b t ′ =9.9±1.2 (stat.) ±1.4 (syst.) GeV-2. The results, when compared to low energy data, show a weak energy dependence of both σγp→ρ{variant}0p and of the t-slope. The ρ 0 is produced predominantly with transverse polarisation, demostrating that s-channel helicity conservation holds at these energies. © 1996 Springer-Verlag.
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