The ZEUS Leading Proton Spectrometer and its Use in the Measurement of Elastic Ρ⁰ Photoproduction at HERA

Authors

• M. Derrick, Argonne National Laboratory
• D. Krakauer, Argonne National Laboratory
• S. Magill, Argonne National Laboratory
• D. Mikunas, Argonne National Laboratory
• B. Musgrave, Argonne National Laboratory
• J. R. Okrasiński, Argonne National Laboratory
• J. Repond, Argonne National Laboratory
• R. Stanek, Argonne National Laboratory
• R. L. Talaga, Argonne National Laboratory
• H. Zhang, Argonne National Laboratory
• Margarita C. K. Mattingly, Andrews UniversityFollow
• F. Anselmo, Alma Mater Studiorum Università di Bologna
• P. Antonioli, Alma Mater Studiorum Università di Bologna
• G. Bari, Alma Mater Studiorum Università di Bologna
• M. Basile, Alma Mater Studiorum Università di Bologna
• L. Bellagamba, Alma Mater Studiorum Università di BolognaFollow
• D. Boscherini, Alma Mater Studiorum Università di Bologna
• A. Bruni, Alma Mater Studiorum Università di Bologna
• G. Bruni, Alma Mater Studiorum Università di Bologna
• P. Bruni, Alma Mater Studiorum Università di Bologna
• G. Cara Romeo, Alma Mater Studiorum Università di Bologna
• G. Castellini, Alma Mater Studiorum Università di Bologna
• M. Chiarini, Alma Mater Studiorum Università di Bologna
• L. Cifarelli, Alma Mater Studiorum Università di Bologna
• F. Cindolo, Alma Mater Studiorum Università di Bologna
• A. Contin, Alma Mater Studiorum Università di Bologna
• M. Corradi, Alma Mater Studiorum Università di Bologna
• I. Gialas, Alma Mater Studiorum Università di Bologna
• P. Giusti, Alma Mater Studiorum Università di Bologna
• G. Iacobucci, Alma Mater Studiorum Università di Bologna
• G. Laurenti, Alma Mater Studiorum Università di Bologna

Document Type

Article

Publication Date

1-1-1997

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. © Springler-Verlag 1997.

Journal Title

Zeitschrift fur Physik C-Particles and Fields

Volume

73

Issue

2

First Page

253

Last Page

268

DOI

https://doi.org/10.1007/s002880050314

First Department

Physics

Recommended Citation

Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Okrasiński, J. R.; Repond, J.; Stanek, R.; Talaga, R. L.; Zhang, H.; Mattingly, Margarita C. K.; Anselmo, F.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Bruni, P.; Cara Romeo, G.; Castellini, G.; Chiarini, M.; Cifarelli, L.; Cindolo, F.; Contin, A.; Corradi, M.; Gialas, I.; Giusti, P.; Iacobucci, G.; and Laurenti, G., "The ZEUS Leading Proton Spectrometer and its Use in the Measurement of Elastic Ρ⁰ Photoproduction at HERA" (1997). Faculty Publications. 2696.
https://digitalcommons.andrews.edu/pubs/2696

Acknowledgements

Accepted version retrieved July 20, 2021 from https://arxiv.org/pdf/hep-ex/9609003.pdf