Elastic and proton-dissociative rho(0) photoproduction at HERA
| Title: | Elastic and proton-dissociative rho(0) photoproduction at HERA |
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| Authors: | Breitweg J; Derrick M; Krakauer D; Magill S; Mikunas D; Musgrave B; Repond J; Stanek R; Talaga RL; Yoshida R; Zhang H; Mattingly MCK; Anselmo F; Antonioli P; Bari G; Basile M; Bellagamba L; Boscherini D; Bruni A; Bruni G; Romeo GC; Castellini G; Chiarini M; Cifarelli L; Cindolo F; Contin A; Corradi M; De Pasquale S; Gialas I; Giusti P; Iacobucci G; Laurenti G; Levi G; Margotti A; Massam T; Nania R; Nemoz C; Palmonari F; Pesci A; Polini A; Ricci F; Sartorelli G; Garcia YZ; Zichichi A; Amelung C; Bornheim A; Brock I; Coboken K; Crittenden J; Deffner R; Eckert M; Grothe M; Hartmann H; Heinloth K; Heinz L; Hilger E; Jakob HP; Katz UF; Kerger R; Paul E; Pfeiffer M; Rembser C; Stamm J; Wedemeyer R; Wieber H; Bailey DS; Campbell Robson S; Cottingham WN; Hall Wilton R; Hayes ME; Heath GP; McFall JD; Piccioni D; Roff DG; Tapper RJ; Arneodo M; Ayad R; Capua M; Iannotti L; Schioppa M; Susinno G; Kim JY; Lee JH; Lim IT; Pac MY; Caldwell A; Cartiglia N; Jing Z; Liu W; Mellado B; Parsons JA; Ritz S; Sampson S; Sciulli F; Straub PB; Zhu Q; Borzemski P; Chwastowski J; Eskreys A; Figiel J; Klimek K; Przybycien MB; Zawiejski L; Adamczyk L; Bednarek B; Bukowy M; Czermak A; Jelen K; Kisielewska D; Kowalski T; Przybycien M; Rulikowska Zarebska E; Suszycki L; Zajac J; Dulinski Z; Kotanski A; Abbiendi G; Bauerdick LAT; Behrens U; Beier H; Bienlein JK; Cases G; Deppe O; Desler K; Drews G; Fricke U; Gilkinson DJ; Glasman C; Gottlicher P; Haas T; Hain W; Hasell D; Johnson KF; Kasemann M; Koch W; Kotz U; Kowalski H; Labs J; Lindemann L; Lohr B; Lowe M; Manczak O; Milewski J; Monteiro T; Ng JST; Notz D; Ohrenberg K; Park IH; Pellegrino A; Pelucchi F; Piotrzkowski K; Roco M; Rohde M; Roldan J; Ryan JJ; Savin AA; Schneekloth U; Schwarzer O; Selonke F; Surrow B; Tassi E; Voss T; Westphal D; Wolf G; Wollmer U; Youngman C; Zarnecki AF; Zeuner W; Burow BD; Grabosch HJ; Meyer A; Schlenstedt S; Barbagli G; Gallo E; Pelfer P; Anzivino G; Maccarrone G; Votano L; Bamberger A; Eisenhardt S; Markun P; Trefzger T; Wolfle S; Bromley JT; Brook NH; Bussey PJ; Doyle AT; Macdonald N; Saxon DH; Sinclair LE; Strickland E; Waugh R; Bohnet I; Gendner N; Holm U; Meyer Larsen A; Salehi H; Wick K; Gladilin LK; Horstmann D; Kcira D; Klanner R; Lohrmann E; Poelz G; Schott W; Zetsche F; Bacon TC; Butterworth I; Cole JE; Howell G; Hung BHY; Lamberti L; Long KR; Miiller DB; Pavel N; Prinias A; Sedgbeer JK; Sideris D; Walker R; Mallik U; Wang SM; Wu JT; Cloth P; Filges D; Fleck JI; Ishii T; Kuze M; Suzuki I; Tokushuku K; Yamada S; Yamauchi K; Yamazaki Y; Hong SJ; Lee SB; Nam SW; Park SK; Barreiro F; Fernandez JP; Garcia G; Graciani R; Hernandez JM; Hervas L; Labarga L; Martinez M; del Peso J; Puga J; Terron J; de Troconiz JF; Corriveau F; Hanna DS; Hartmann J; Hung LW; Murray WN; Ochs A; Riveline M; Stairs DG; St Laurent M; Ullmann R; Tsurugai T; Bashkirov V; Dolgoshein BA; Stifutkin A; Bashindzhagyan GL; Ermolov PF; Golubkov YA; Khein LA; Korotkova NA; Korzhavina IA; Kuzmin VA; Lukina OY; Proskuryakov AS; Shcheglova LM; Solomin AN; Zotkin SA; Bokel C; Botje M; Brummer N; Chlebana F; Engelen J; Koffeman E; Kooijman P; van Sighem A; Tiecke H; Tuning N; Verkerke W; Vossebeld J; Vreeswijk M; Wiggers L; de Wolf E; Acosta D; Bylsma B; Durkin LS; Gilmore J; Ginsburg CM; Kim CL; Ling TY; Nylander P; Romanowski TA; Blaikley HE; Cashmore RJ; Cooper Sarkar AM; Devenish RCE; Edmonds JK; Grosse Knetter J; Harnew N; Nath C; Noyes VA; Quadt A; Ruske O; Tickner JR; Uijterwaal H; Walczak R; Waters DS; Bertolin A; Dal Corso F; Dosselli U; Limentani S; Morandin M; Posocco M; Stanco L; Voci C; Bulmahn J; Oh BY; Okrasinski JR; Toothacker WS; Whitmore JJ; Iga Y; D'Agostini G; Marini G; Nigro A; Raso M; Hart JC; McCubbin NA; Shah TP; Barberis E; Epperson D; Heusch C; Rahn JT; Sadrozinski HFW; Seiden A; Wichmann R; Williams DC; Abramowicz H; Briskin G; Dagan S; Kananov S; Levy A; Abe T; Fusayasu T; Inuzuka M; Nagano K; Umemori K; Yamashita T; Hamatsu R; Hirose T; Homma K; Kitamura S; Matsushita T; Cirio R; Costa M; Ferrero MI; Maselli S; Monaco V; Peroni C; Petrucci MC; Ruspa M; Sacchi R; Solano A; Staiano A; Dardo M; Bailey DC; Fagerstroem CP; Galea R; Hartner GF; Joo KK; Levman GM; Martin JF; Orr RS; Polenz S; Sabetfakhri A; Simmons D; Teuscher RJ; Butterworth JM; Catterall CD; Jones TW; Lane JB; Saunders RL; Sutton MR; Wing M; Ciborowski J; Grzelak G; Kasprzak M; Muchorowski K; Nowak RJ; Pawlak JM; Pawlak R; Tymieniecka T; Wroblewski AK; Zakrzewski JA; Adamus M; Coldewey C; Eisenberg Y; Hochman D; Karshon U; Badgett WF; Chapin D; Cross R; Dasu S; Foudas C; Loveless RJ; Mattingly S; Reeder DD; Smith WH; Vaiciulis A; Wodarczyk M; Deshpande A; Dhawan S; Hughes VW; Bhadra S; Frisken WR; Khakzad M; Schmidke WB; GARFAGNINI, ALBERTO; BRUGNERA, RICCARDO; CARLIN, ROBERTO; STROILI, ROBERTO |
| Contributors: | Breitweg, J; Derrick, M; Krakauer, D; Magill, S; Mikunas, D; Musgrave, B; Repond, J; Stanek, R; Talaga, Rl; Yoshida, R; Zhang, H; Mattingly, Mck; Anselmo, F; Antonioli, P; Bari, G; Basile, M; Bellagamba, L; Boscherini, D; Bruni, A; Bruni, G; Romeo, Gc; Castellini, G; Chiarini, M; Cifarelli, L; Cindolo, F; Contin, A; Corradi, M; De Pasquale, S; Gialas, I; Giusti, P; Iacobucci, G; Laurenti, G; Levi, G; Margotti, A; Massam, T; Nania, R; Nemoz, C; Palmonari, F; Pesci, A; Polini, A; Ricci, F; Sartorelli, G; Garcia, Yz; Zichichi, A; Amelung, C; Bornheim, A; Brock, I; Coboken, K; Crittenden, J; Deffner, R; Eckert, M; Grothe, M; Hartmann, H; Heinloth, K; Heinz, L; Hilger, E; Jakob, Hp; Katz, Uf; Kerger, R; Paul, E; Pfeiffer, M; Rembser, C; Stamm, J; Wedemeyer, R; Wieber, H; Bailey, D; Campbell Robson, S; Cottingham, Wn; Hall Wilton, R; Hayes, Me; Heath, Gp; Mcfall, Jd; Piccioni, D; Roff, Dg; Tapper, Rj; Arneodo, M; Ayad, R; Capua, M; Garfagnini, Alberto; Iannotti, L; Schioppa, M; Susinno, G; Kim, Jy; Lee, Jh; Lim, It; Pac, My; Caldwell, A; Cartiglia, N; Jing, Z; Liu, W; Mellado, B; Parsons, Ja; Ritz, S; Sampson, S; Sciulli, F; Straub, Pb; Zhu, Q; Borzemski, P; Chwastowski, J |
| Publication Year: | 1998 |
| Collection: | Padua Research Archive (IRIS - Università degli Studi di Padova) |
| Description: | Elastic and proton-dissociative p(o) photoproduction (gamma p --> rho(o)p, gamma p --> rho(o)N, respectively, with rho(o) --> pi(+)pi(-)) has been studied in ep interactions at HERA for photon-proton centre-of-mass energies in the range 50 < W < 100 GeV and for t < 0.5 GeV(2), where t is the square of the four-momentum transfer at the proton vertex; the results on the proton-dissociative reaction are presented for masses of the dissociated proton system in the range M(N)(2) < 0.1W(2). For the elastic process, the pi(+)pi(-) invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the rho(o) resonance shape is asymmetric; this asymmetry decreases with increasing t, as expected in models in which the asymmetry is ascribed to the interference of resonant and non-resonant pi(+)pi(-) production. The cross section has been studied as a function of W; a fit to the resonant part with the form W(a) gives a=0.16 +/- 0.06 (stat.)(-0.15)(+0.11) (syst.). The resonant part of the gamma p --> pi(+)pi(-) p cross section is 11.2 +/- 0.1 (stat.)(-1.2)(+1.1)(syst.) mu b at [W] = 71.7 GeV. The t dependence of the cross section can be described by a function of the type A(rho) exp (-b(rho)\t\ + c(p)t(2)) with b(rho) = 10.9 +/- 0.3 (stat.)(-0.5)(+1.0) (syst.) GeV(-2) and c(rho) = 2.7 +/- 0.9 (stat.)(-1.7)(+1.9) (syst.) GeV(-4). The t dependence has also been studied as a function of W and a value of the slope of the pomeron trajectory alpha(IP)' = 0.23 +/- 0.15 (stat.)(-0.07)(+0.10), (syst.) GeV(-2) has been deduced. The rho(o) spin density matrix elements r(00)(04), r(1-1)(04) and Re[r(10)(04)] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative pi(+)pi(-) photoproduction in the rho(o) mass range, the distributions of the two-pion invariant mass, Wi and the polar and azimuthal angles of the pions in the helicity frame are the same within errors as those for the elastic process. The t ... |
| Document Type: | article in journal/newspaper |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000073323300004; volume:2; firstpage:247; lastpage:267; numberofpages:21; journal:THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS; https://hdl.handle.net/11577/2463878 |
| DOI: | 10.1007/s100520050136 |
| Availability: | https://hdl.handle.net/11577/2463878; https://doi.org/10.1007/s100520050136 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Altro ; license uri:other-oa |
| Accession Number: | edsbas.EC89E51E |
| Database: | BASE |