The Zeus Leading Proton Spectrometer And Its Use In The Measurement Of Elastic Rho(0) Photoproduction At Hera

M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave,Jr Okrasinski, J Repond, R Stanek,Rl Talaga, H Zhang,Mck Mattingly, F Anselmo, P Antonioli,G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni,Gc 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 Pesci, A Polini, G Sartorelli,Yz Garcia, A Zichichi, C Amelung, A Bornheim, J Crittenden, R Deffner, M Eckert,L Feld, A Frey, M Geerts, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger,Hp Jakob,Uf Katz, S Mengel, E Paul, M Pfeiffer, C Rembser, D Schramm, J Stamm, R Wedemeyer, S Campbellrobson, A Cassidy,Wn Cottingham, N Dyce, B Foster, S George, Me Hayes,Gp Heath,Hf Heath, D Piccioni,Dg Roff,Rj Tapper, R Yoshida,M Arneodo, R Ayad,M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, A Caldwell, N Cartiglia, Z Jing, W Liu,Ja Parsons, S Ritz, F Sciulli,Pb Straub, L Wai, S Yang, Q Zhu, P Borzemski,J Chwastowski, A Eskreys, Z Jakubowski,Mb Przybycien, M Zachara,L Zawiejski,L Adamczyk, B Bednarek, K Jelen, D Kisielewska, T Kowalski,M Przybycien, E Rulikowskazarebska, L Suszycki, J Zajac, Z Dulinski, A Kotanski,G Abbiendi,Lat Bauerdick, U Behrens, H Beier,Jk Bienlein, G Cases, O Deppe, K Desler, G Drews, M Flasinski,Dj Gilkinson,C Glasman, P Gottlicher, J Grosseknetter, T Haas, W Hain, D Hasell,H Hessling, Y Iga,Kf Johnson, P Joos,M Kasemann,R Klanner, W Koch, U Kotz, H Kowalski, J Labs, A Ladage, B Lohr, M Lowe, D Luke, J Mainusch, O Manczak, J Milewski, T Monteiro,Jst Ng, D Notz, K Ohrenberg,K Piotrzkowski, M Roco, M Rohde, J Roldan, U Schneekloth, W Schulz, F Selonke, B Surrow,E Tassi, T Voss, D Westphal, G Wolf, U Wollmer, C Youngman, W Zeuner,Hj Grabosch,Sm Mari, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Anzivino, G Maccarrone, S Depasquale, L Votano, A Bamberger,S Eisenhardt, T Trefzger, S Wolfle,Jt Bromley,Nh Brook,Pj Bussey,At Doyle,Dh Saxon,Le Sinclair, E Strickland,Ml Utley, R Waugh,As Wilson, A Dannemann, U Holm, D Horstmann, R Sinkus, K Wick,Bd Burow, L Hagge, E Lohrmann, G Poelz, W Schott, F Zetsche,Tc Bacon, N Brummer, I Butterworth,Vl Harris, G Howell,Bhy Hung, L Lamberti,Kr Long,Db Miller, N Pavel, A Prinias,Jk Sedgbeer, D Sideris,Af Whitfield, U Mallik,Mz Wang,Sm Wang,Jt Wu, P Cloth, D Filges,Sh An, Gh Cho, Bj Ko,Sb Lee,Sw Nam,Hs Park,Sk Park,Hj Kim,Rr Mcneil, W Metcalf,Vk Nadendla,F Barreiro,Jp Fernandez, R Graciani,Jm Hernandez, L Hervas, L Labarga, M Martinez, J Delpeso, J Puga,J Terron,Jf Detroconiz,F Corriveau,Ds Hanna, J Hartmann,Lw Hung,Jn Lim,Cg Matthews,Wn Murray, A Ochs,Pm Patel, M Riveline,Dg Stairs, M Stlaurent, R Ullmann, G Zacek, T Tsurugai, V Bashkirov, Ba Dolgoshein, A Stifutkin,Gl Bashindzhagyan,Pf Ermolov,Lk Gladilin,Ya Golubkov,Vd Kobrin,Ia Korzhavina,Va Kuzmin,Oy Lukina,As Proskuryakov,Aa Savin,Lm Shcheglova,An Solomin,Np Zotov, M Botje, F Chlebana, J Engelen, M Dekamps, P Kooijman, A Kruse, A Vansighem, H Tiecke, W Verkerke, J Vossebeld, M Vreeswijk,L Wiggers, E Dewolf, R Vanwoudenberg, D Acosta, B Bylsma,Ls Durkin, J Gilmore,Cm Ginsburg,Cl Kim, C Li,Ty Ling, P Nylander,Ih Park,Ta Romanowski,Rj Cashmore,Am Coopersarkar,Rce Devenish, N Harnew, M Lancaster, L Lindemann,Jd Mcfall, C Nath,Va Noyes, A Quadt,Jr Tickner, H Uijterwaal, R Walczak,Ds Waters,Ff Wilson, T Yip, A Bertolin, R Brugnera, R Carlin, F Dalcorso, M Degiorgi, U Dosselli, S Limentani, M Morandin, M Posocco, L Stanco, R Stroili, C Voci, F Zuin, J Bulmahn,Rg Feild,By Oh,Jj Whitmore, G Dagostini, G Marini, A Nigro,Jc Hart,Na Mccubbin,Tp Shah, E Barberis, T Dubbs, C Heusch, M Vanhook, W Lockman, Jt Rahn, Hfw Sadrozinski, A Seiden,Dc Williams, J Biltzinger,Rj Seifert, O Schwarzer,Ah Walenta, H Abramowicz, G Briskin, S Dagan, T Doeker, A Levy, Ji Fleck, M Inuzuka, T Ishii, M Kuze, S Mine, M Nakao, I Suzuki, K Tokushuku,K Umemori, S Yamada,Y Yamazaki, M Chiba, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, K Yamauchi, R Cirio, M Costa,Mi Ferrero, S Maselli, C Peroni, R Sacchi, A Solano, A Staiano, M Dardo,Dc Bailey, F Benard, M Brkic,Cp Fagerstroem,Gf Hartner,Kk Joo,Gm Levman,Jf Martin,Rs Orr, S Polenz,Cr Sampson, D Simmons,Rj Teuscher,Jm Butterworth,Cd Catterall,Tw Jones,Pb Kaziewicz,Jb Lane,Rl Saunders, J Shulman,Mr Sutton, B Lu,Lw Mo, W Bogusz,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, C Coldewey, Y Eisenberg, D Hochman, U Karshon, D Revel, D Zerzion, Wf Badgett, J Breitweg, D Chapin, R Cross, S Dasu, C Foudas,Rj Loveless, S Mattingly,Dd Reeder, S Silverstein,Wh Smith, A Vaiciulis, M Wodarczyk, S Bhadra,Ml Cardy,Wr Frisken, M Khakzad,Wb Schmidke

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1997）

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摘要

The differential cross section d sigma/dt for elastic rho(0) photoproduction, gamma p --> rho(0)p (rho(0) --> pi(+)pi(-)), has been measured in ep interactions at HERA. The squared four-momentum exchanged at the proton vertex, t, has been determined directly by measuring the momentum of the scattered proton using the ZEUS Leading Proton Spectrometer (LPS), a large scale system of silicon micro-strip detectors operating close to the HERA proton beam. The LPS allows the measurement of the momentum of high energy protons scattered at small angles with accuracies of 0.4% for the longitudinal momentum and 5 MeV for the transverse momentum. Photoproduction of rho(0) mesons has been investigated in the interval 0.073 < \t\ < 0.40 GeV2, for photon virtualities Q(2) < 1 GeV2 and photon-proton centre-of-mass energies W between 50 and 100 GeV. In the measured range, the t distribution exhibits an exponential shape with a slope parameter b = 9.8 +/- 0.8 (stat.) +/- 1.1 (syst.) GeV-2. The use of the LPS eliminates the contamination from events with diffractive dissociation of the proton into low mass states.

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