Abstract
The differential cross section dσ/dt for elastic ρ0 photoproduction, γp → ρ0ρ (ρ0 → π+π-), 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 ρ0 mesons has been investigated in the interval 0.073 < |t| < 0.40 GeV2, for photon virtualities Q2 < 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.
| Original language | English |
|---|---|
| Pages (from-to) | 253-268 |
| Number of pages | 16 |
| Journal | Zeitschrift fur Physik C-Particles and Fields |
| Volume | 73 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1997 Jan |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
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In: Zeitschrift fur Physik C-Particles and Fields, Vol. 73, No. 2, 01.1997, p. 253-268.
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TY - JOUR
T1 - The ZEUS leading proton spectrometer and its use in the measurement of elastic ρ0 photoproduction at HERA
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N1 - Funding Information: 1 also at IROE Florence, Italy 2 now at University of Salerno and INFN Napoli, Italy 3 now at E.S.R.F., BP220 F-38043 Grenoble, France 4 supported by Worldlab, Lausanne, Switzerland 5 now at University of California, Santa Cruz 6 now a self-employed consultant 7 now at VDI-Technologiezentrum Düsseldorf 8 now at Commasoft, Bonn 9 also at University of Torino and Alexander von Humboldt Fellow 10 Alexander von Humboldt Fellow 11 Alfred P. Sloan Foundation Fellow 12 now at University of Washington, Seattle 13 now at California Institute of Technology, Los Angeles 14 supported by an EC fellowship number ERBFMBICT 950172 15 now at Inst. of Computer Science, Jagellonian University, Cracow 16 visitor from Florida State University 17 now at DESY Computer Center 18 supported by European Community Program PRAXIS XXI 19 present address: Dipartimento di Fisica, Università “La Sapienza”, Rome 20 now at University of Perugia, I-06100 Perugia, Italy 21 now at ATLAS Collaboration, University of Munich 22 now at Star Division Entwicklungs-und Vertriebs-GmbH, Hamburg 23 now at Philips Medizin Systeme, Hamburg 24 also supported by NSERC, Canada 25 supported by an EC fellowship 26 PPARC Post-doctoral Fellow 27 now at Park Medical Systems Inc., Lachine, Canada 28 partially supported by DESY 29 now at Philips Natlab, Eindhoven, NL 30 now at Department of Energy, Washington 31 also at University of Hamburg, Alexander von Humboldt Research Award 32 now at Lawrence Berkeley Laboratory, Berkeley 33 now at Yale University, New Haven, CT 34 supported by a MINERVA Fellowship 35 supported by the Japan Society for the Promotion of Science (JSPS) 36 present address: Tokyo Metropolitan College of Allied Medical Sciences, Tokyo 116, Japan 37 supported by the Polish State Committee for Scientific Research, grant No. 2P03B09308 38 supported by the Polish State Committee for Scientific Research, grant No. 2P03B09208 39 now at TECMAR Incorporated, Toronto a supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) b supported by the FCAR of Québec, Canada c supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), under contract numbers 057BN19P, 057FR19P, 057HH19P, 057HH29P, 057SI75I d supported by the MINERVA Gesellschaft für Forschung GmbH, the Israel Academy of Science and the U.S.-Israel Binational Science Foundation e supported by the German Israeli Foundation, and by the Israel Academy of Science f supported by the Italian National Institute for Nuclear Physics (INFN) g supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research Funding Information: h supported by the Korean Ministry of Education and Korea Science and Engineering Foundation i supported by the Netherlands Foundation for Research on Matter (FOM) j supported by the Polish State Committee for Scientific Research, grants No. 115/E-343/SPUB/P03/109/95, 2P03B 244 08p02, p03, p04 and p05, and the Foundation for Polish-German Collaboration (proj. No. 506/92) k supported by the Polish State Committee for Scientific Research (grant No. 2 P03B 083 08) and Foundation for Polish-German Collaboration l partially supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF) m supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), and the Fund of Fundamental Research of Russian Ministry of Science and Education and by INTAS-Grant No. 93-63 n supported by the Spanish Ministry of Education and Science through funds provided by CICYT o supported by the Particle Physics and Astronomy Research Council p supported by the US Department of Energy q supported by the US National Science Foundation Funding Information: We also want to express our gratitude to all those who have participated in the construction of the LPS, in particular to the very many people from the University of Bologna and INFN Bologna (B), CERN (C), the University of Calabria and INFN Cosenza (Cs), DESY (D), LAA (L) [31], the University of Torino and INFN Torino (T ), the University of California at Santa Cruz (S), who have so greatly contributed to the LPS project at various stages. For financial support we are grateful to the Italian Istituto Nazionale di Fisica Nucleare (INFN), to the LAA project and to the US Department of Energy. For the mechanical design and construction of the stations and their interface with HERA: G. AlfaroneT, F. CallàT, J. DickeD, G. DugheraT, P. FordL, H. GiesenbergD, R. GiesenbergD, G. GiraudoT, M. HouricanL, A. PierettiB, P. PietschD. For discussions on the optical design and on the mechanical interface with HERA and for making some modifications to the machine lay-out to improve the LPS acceptance: W. BialowonsD, R. BrinkmanD, D. DegeleD, R. HellerD, B. HolzerD, R. KoseD, M. LeenenD, G. NawrathD, K. SinramD, D. TrinesD, T. WeilandD and F. WillekeD. For advice on radiation doses and hardness of service electronics: H. DinterD, B. LisowskiB and H. SchoenbacherC. For metrology and survey: C. BoudineauC, R. KusD, F. LoefflerD and the DESY survey team. For special monitor information from HERA and the design of the interlock system: P. DuvalD, S. HerbD, K.-H. MessD, F. PetersD, W. SchuetteD, M. WendtD. For installation and services: W. BeckhusenD, H. Grabe-CelikD, G. KesslerD, G. MeyerD, N. MeynersD, W. RadloffD, U. RiemerD and F.R. UllrichD. For developing elliptical cutting of detectors: N. MezinC and I. SextonC. For vacuum design, testing and urgent repairs: R. HenslerD, J. KouptsidisD, J. RoemerD and H-P. WedekindD. For front-end electronics design and front-end assembly: D. DorfanS, J. De WittS, W.A. RoweS, E. SpencerS and A. WebsterS.
PY - 1997/1
Y1 - 1997/1
N2 - The differential cross section dσ/dt for elastic ρ0 photoproduction, γp → ρ0ρ (ρ0 → π+π-), 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 ρ0 mesons has been investigated in the interval 0.073 < |t| < 0.40 GeV2, for photon virtualities Q2 < 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.
AB - The differential cross section dσ/dt for elastic ρ0 photoproduction, γp → ρ0ρ (ρ0 → π+π-), 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 ρ0 mesons has been investigated in the interval 0.073 < |t| < 0.40 GeV2, for photon virtualities Q2 < 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.
UR - http://www.scopus.com/inward/record.url?scp=33750659330&partnerID=8YFLogxK
U2 - 10.1007/s002880050314
DO - 10.1007/s002880050314
M3 - Article
AN - SCOPUS:33750659330
SN - 0170-9739
VL - 73
SP - 253
EP - 268
JO - Zeitschrift fur Physik C-Particles and Fields
JF - Zeitschrift fur Physik C-Particles and Fields
IS - 2
ER -