Abstract
Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) 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 GeV2, 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 M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 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 π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (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 α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W 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 distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).
| Original language | English |
|---|---|
| Pages (from-to) | 247-267 |
| Number of pages | 21 |
| Journal | European Physical Journal C |
| Volume | 2 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1998 |
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)
Fingerprint
Dive into the research topics of 'Elastic and proton-dissociative ρ0 photoproduction at HERA'. Together they form a unique fingerprint.Cite this
- APA
- Standard
- Harvard
- Vancouver
- Author
- BIBTEX
- RIS
In: European Physical Journal C, Vol. 2, No. 2, 1998, p. 247-267.
Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Elastic and proton-dissociative ρ0 photoproduction at HERA
AU - Breitweg, J.
AU - Derrick, M.
AU - Krakauer, D.
AU - Magill, S.
AU - Mikunas, D.
AU - Musgrave, B.
AU - Repond, J.
AU - Stanek, R.
AU - Talaga, R. L.
AU - Yoshida, R.
AU - Zhang, H.
AU - Mattingly, M. C.K.
AU - Anselmo, F.
AU - Antonioli, P.
AU - Bari, G.
AU - Basile, M.
AU - Bellagamba, L.
AU - Boscherini, D.
AU - Bruni, A.
AU - Bruni, G.
AU - Cara Romeo, G.
AU - Castellini, G.
AU - Chiarini, M.
AU - Cifarelli, L.
AU - Cindolo, F.
AU - Contin, A.
AU - Corradi, M.
AU - de Pasquale, S.
AU - Gialas, I.
AU - Giusti, P.
AU - Iacobucci, G.
AU - Laurenti, G.
AU - Levi, G.
AU - Margotti, A.
AU - Massam, T.
AU - Nania, R.
AU - Nemoz, C.
AU - Palmonari, F.
AU - Pesci, A.
AU - Polini, A.
AU - Ricci, F.
AU - Sartorelli, G.
AU - Zamora Garcia, Y.
AU - Zichichi, A.
AU - Amelung, C.
AU - Bornheim, A.
AU - Brock, I.
AU - Coböken, K.
AU - Crittenden, J.
AU - Deffner, R.
AU - Eckert, M.
AU - Grothe, M.
AU - Hartmann, H.
AU - Heinloth, K.
AU - Heinz, L.
AU - Hilger, E.
AU - Jakob, H. P.
AU - Katz, U. F.
AU - Kerger, R.
AU - Paul, E.
AU - Pfeiffer, M.
AU - Rembser, Ch
AU - Stamm, J.
AU - Wedemeyer, R.
AU - Wieber, H.
AU - Bailey, D. S.
AU - Campbell-Robson, S.
AU - Cottingham, W. N.
AU - Foster, B.
AU - Hall-Wilton, R.
AU - Hayes, M. E.
AU - Heath, G. P.
AU - Heath, H. F.
AU - McFall, J. D.
AU - Piccioni, D.
AU - Roff, D. G.
AU - Tapper, R. J.
AU - Arneodo, M.
AU - Ayad, R.
AU - Capua, M.
AU - Garfagnini, A.
AU - Iannotti, L.
AU - Schioppa, M.
AU - Susinno, G.
AU - Kim, J. Y.
AU - Lee, J. H.
AU - Lim, I. T.
AU - Pac, M. Y.
AU - Caldwell, A.
AU - Cartiglia, N.
AU - Jing, Z.
AU - Liu, W.
AU - Mellado, B.
AU - Parsons, J. A.
AU - Ritz, S.
AU - Sampson, S.
AU - Sciulli, F.
AU - Straub, P. B.
AU - Zhu, Q.
AU - Borzemski, P.
AU - Chwastowski, J.
AU - Eskreys, A.
AU - Figiel, J.
AU - Klimek, K.
AU - Przybycień, M. B.
AU - Zawiejski, L.
AU - Adamczyk, L.
AU - Bednarek, B.
AU - Bukowy, M.
AU - Czermak, A.
AU - Jeleń, K.
AU - Kisielewska, D.
AU - Kowalski, T.
AU - Rulikowska-Zarebska, E.
AU - Suszycki, L.
AU - Zaja̧c, J.
AU - Dulinński, Z.
AU - Kotanński, A.
AU - Abbiendi, G.
AU - Bauerdick, L. A.T.
AU - Behrens, U.
AU - Beier, H.
AU - Bienlein, J. K.
AU - Cases, G.
AU - Deppe, O.
AU - Desler, K.
AU - Drews, G.
AU - Fricke, U.
AU - Gilkinson, D. J.
AU - Glasman, C.
AU - Göttlicher, P.
AU - Haas, T.
AU - Hain, W.
AU - Hasell, D.
AU - Johnson, K. F.
AU - Kasemann, M.
AU - Koch, W.
AU - Kötz, U.
AU - Kowalski, H.
AU - Labs, J.
AU - Lindemann, L.
AU - Löhr, B.
AU - Löwe, M.
AU - Mańczak, O.
AU - Milewski, J.
AU - Monteiro, T.
AU - Ng, J. S.T.
AU - Notz, D.
AU - Ohrenberg, K.
AU - Park, I. H.
AU - Pellegrino, A.
AU - Pelucchi, F.
AU - Piotrzkowski, K.
AU - Roco, M.
AU - Rohde, M.
AU - Roldán, J.
AU - Ryan, J. J.
AU - Savin, A. A.
AU - Schneekloth, U.
AU - Schwarzer, O.
AU - Selonke, F.
AU - Surrow, B.
AU - Tassi, E.
AU - Voß, T.
AU - Westphal, D.
AU - Wolf, G.
AU - Wollmer, U.
AU - Youngman, C.
AU - Zarnecki, A. F.
AU - Zeuner, W.
AU - Burow, B. D.
AU - Grabosch, H. J.
AU - Meyer, A.
AU - Schlenstedt, S.
AU - Barbagli, G.
AU - Gallo, E.
AU - Pelfer, P.
AU - Anzivino, G.
AU - Maccarrone, G.
AU - Votano, L.
AU - Bamberger, A.
AU - Eisenhardt, S.
AU - Markun, P.
AU - Trefzger, T.
AU - Wölfle, S.
AU - Bromley, J. T.
AU - Brook, N. H.
AU - Bussey, P. J.
AU - Doyle, A. T.
AU - Macdonald, N.
AU - Saxon, D. H.
AU - Sinclair, L. E.
AU - Strickland, E.
AU - Waugh, R.
AU - Bohnet, I.
AU - Gendner, N.
AU - Holm, U.
AU - Meyer-Larsen, A.
AU - Salehi, H.
AU - Wick, K.
AU - Gladilin, L. K.
AU - Horstmann, D.
AU - Kçira, D.
AU - Klanner, R.
AU - Lohrmann, E.
AU - Poelz, G.
AU - Schott, W.
AU - Zetsche, F.
AU - Bacon, T. C.
AU - Butterworth, I.
AU - Cole, J. E.
AU - Howell, G.
AU - Hung, B. H.Y.
AU - Lamberti, L.
AU - Long, K. R.
AU - Miller, D. B.
AU - Pavel, N.
AU - Prinias, A.
AU - Sedgbeer, J. K.
AU - Sideris, D.
AU - Walker, R.
AU - Mallik, U.
AU - Wang, S. M.
AU - Wu, J. T.
AU - Cloth, P.
AU - Filges, D.
AU - Fleck, J. I.
AU - Ishii, T.
AU - Kuze, M.
AU - Suzuki, I.
AU - Tokushuku, K.
AU - Yamada, S.
AU - Yamauchi, K.
AU - Yamazaki, Y.
AU - Hong, S. J.
AU - Lee, S. B.
AU - Nam, S. W.
AU - Park, S. K.
AU - Barreiro, F.
AU - Fernández, J. P.
AU - García, G.
AU - Graciani, R.
AU - Hernández, J. M.
AU - Hervás, L.
AU - Labarga, L.
AU - Martínez, M.
AU - del Peso, J.
AU - Puga, J.
AU - Terrón, J.
AU - de Trocóniz, J. F.
AU - Corriveau, F.
AU - Hanna, D. S.
AU - Hartmann, J.
AU - Hung, L. W.
AU - Murray, W. N.
AU - Ochs, A.
AU - Riveline, M.
AU - Stairs, D. G.
AU - St-Laurent, M.
AU - Ullmann, R.
AU - Tsurugai, T.
AU - Bashkirov, V.
AU - Dolgoshein, B. A.
AU - Stifutkin, A.
AU - Bashindzhagyan, G. L.
AU - Ermolov, P. F.
AU - Golubkov, Y. A.
AU - Khein, L. A.
AU - Korotkova, N. A.
AU - Korzhavina, I. A.
AU - Kuzmin, V. A.
AU - Lukina, O. Y.
AU - Proskuryakov, A. S.
AU - Shcheglova, L. M.
AU - Solomin, A. N.
AU - Zotkin, S. A.
AU - Bokel, C.
AU - Botje, M.
AU - Brümmer, N.
AU - Chlebana, F.
AU - Engelen, J.
AU - Koffeman, E.
AU - Kooijman, P.
AU - van Sighem, A.
AU - Tiecke, H.
AU - Tuning, N.
AU - Verkerke, W.
AU - Vossebeld, J.
AU - Vreeswijk, M.
AU - Wiggers, L.
AU - de Wolf, E.
AU - Acosta, D.
AU - Bylsma, B.
AU - Durkin, L. S.
AU - Gilmore, J.
AU - Ginsburg, C. M.
AU - Kim, C. L.
AU - Ling, T. Y.
AU - Nylander, P.
AU - Romanowski, T. A.
AU - Blaikley, H. E.
AU - Cashmore, R. J.
AU - Cooper-Sarkar, A. M.
AU - Devenish, R. C.E.
AU - Edmonds, J. K.
AU - Große-Knetter, J.
AU - Harnew, N.
AU - Nath, C.
AU - Noyes, V. A.
AU - Quadt, A.
AU - Ruske, O.
AU - Tickner, J. R.
AU - Uijterwaal, H.
AU - Walczak, R.
AU - Waters, D. S.
AU - Bertolin, A.
AU - Brugnera, R.
AU - Carlin, R.
AU - Dal Corso, F.
AU - Dosselli, U.
AU - Limentani, S.
AU - Morandin, M.
AU - Posocco, M.
AU - Stanco, L.
AU - Stroili, R.
AU - Voci, C.
AU - Bulmahn, J.
AU - Oh, B. Y.
AU - Okrasiński, J. R.
AU - Toothacker, W. S.
AU - Whitmore, J. J.
AU - Iga, Y.
AU - D'Agostini, G.
AU - Marini, G.
AU - Nigro, A.
AU - Raso, M.
AU - Hart, J. C.
AU - McCubbin, N. A.
AU - Shah, T. P.
AU - Barberis, E.
AU - Epperson, D.
AU - Heusch, C.
AU - Rahn, J. T.
AU - Sadrozinski, H. F.W.
AU - Seiden, A.
AU - Wichmann, R.
AU - Williams, D. C.
AU - Abramowicz, H.
AU - Briskin, G.
AU - Dagan, S.
AU - Kananov, S.
AU - Levy, A.
AU - Abe, T.
AU - Fusayasu, T.
AU - Inuzuka, M.
AU - Nagano, K.
AU - Umemori, K.
AU - Yamashita, T.
AU - Hamatsu, R.
AU - Hirose, T.
AU - Homma, K.
AU - Kitamura, S.
AU - Matsushita, T.
AU - Cirio, R.
AU - Costa, M.
AU - Ferrero, M. I.
AU - Maselli, S.
AU - Monaco, V.
AU - Peroni, C.
AU - Petrucci, M. C.
AU - Ruspa, M.
AU - Sacchi, R.
AU - Solano, A.
AU - Staiano, A.
AU - Dardo, M.
AU - Bailey, D. C.
AU - Fagerstroem, C. P.
AU - Galea, R.
AU - Hartner, G. F.
AU - Joo, K. K.
AU - Levman, G. M.
AU - Martin, J. F.
AU - Orr, R. S.
AU - Polenz, S.
AU - Sabetfakhri, A.
AU - Simmons, D.
AU - Teuscher, R. J.
AU - Butterworth, J. M.
AU - Catterall, C. D.
AU - Jones, T. W.
AU - Lane, J. B.
AU - Saunders, R. L.
AU - Sutton, M. R.
AU - Wing, M.
AU - Ciborowski, J.
AU - Grzelak, G.
AU - Kasprzak, M.
AU - Muchorowski, K.
AU - Nowak, R. J.
AU - Pawlak, J. M.
AU - Pawlak, R.
AU - Tymieniecka, T.
AU - Wróblewski, A. K.
AU - Zakrzewski, J. A.
AU - Adamus, M.
AU - Coldewey, C.
AU - Eisenberg, Y.
AU - Hochman, D.
AU - Karshon, U.
AU - Badgett, W. F.
AU - Chapin, D.
AU - Cross, R.
AU - Dasu, S.
AU - Foudas, C.
AU - Loveless, R. J.
AU - Mattingly, S.
AU - Reeder, D. D.
AU - Smith, W. H.
AU - Vaiciulis, A.
AU - Wodarczyk, M.
AU - Deshpande, A.
AU - Dhawan, S.
AU - Hughes, V. W.
AU - Bhadra, S.
AU - Frisken, W. R.
AU - Khakzad, M.
AU - Schmidke, W. B.
PY - 1998
Y1 - 1998
N2 - Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) 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 GeV2, 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 M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 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 π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (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 α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W 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 distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).
AB - Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) 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 GeV2, 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 M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 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 π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (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 α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W 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 distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).
UR - http://www.scopus.com/inward/record.url?scp=0001043232&partnerID=8YFLogxK
U2 - 10.1007/s100529800834
DO - 10.1007/s100529800834
M3 - Article
AN - SCOPUS:0001043232
SN - 1434-6044
VL - 2
SP - 247
EP - 267
JO - European Physical Journal C
JF - European Physical Journal C
IS - 2
ER -