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The HERMES recoil detector

  • A. Airapetian
  • , E. C. Aschenauer
  • , S. Belostotski
  • , A. Borisenko
  • , J. Bowles
  • , I. Brodski
  • , V. Bryzgalov
  • , J. Burns
  • , G. P. Capitani
  • , V. Carassiti
  • , G. Ciullo
  • , A. Clarkson
  • , M. Contalbrigo
  • , R. De Leo
  • , E. De Sanctis
  • , M. Diefenthaler
  • , P. Di Nezza
  • , M. Düren
  • , M. Ehrenfried
  • , H. Guler
  • I. M. Gregor, M. Hartig, G. Hill, M. Hoek, Y. Holler, I. Hristova, H. S. Jo, R. Kaiser, T. Keri, A. Kisselev, B. Krause, B. Krauss, L. Lagamba, I. Lehmann, P. Lenisa, S. Lu, X. -G Lu, S. Lumsden, D. Mahon, A. Martinez De La Ossa, M. Murray, A. Mussgiller, W. -D Nowak, Y. Naryshkin, A. Osborne, L. L. Pappalardo, R. Perez-Benito, A. Petrov, N. Pickert, V. Prahl, D. Protopopescu, M. Reinecke, C. Riedl, K. Rith, G. Rosner, L. Rubacek, D. Ryckbosch, Y. Salomatin, G. Schnell, B. Seitz, C. Shearer, V. Shutov, M. Statera, J. J.M. Steijger, H. Stenzel, J. Stewart, F. Stinzing, A. Trzcinski, M. Tytgat, A. Vandenbroucke, Y. Van Haarlem, C. Van Hulse, M. Varanda, D. Veretennikov, I. Vilardi, V. Vikhrov, C. Vogel, S. Yaschenko, Z. Ye, W. Yu, D. Zeiler, B. Zihlmann
  • Justus Liebig University Giessen
  • University of Michigan, Ann Arbor
  • German Electron Synchrotron
  • Brookhaven National Laboratory
  • University of Glasgow
  • National Institute for Nuclear Physics
  • Institute for High Energy Physics
  • University of Ferrara
  • Friedrich-Alexander University Erlangen-Nürnberg
  • University of Illinois at Urbana-Champaign
  • Siemens
  • International Atomic Energy Agency
  • RAS - Saint Petersburg Nuclear Physics Institute
  • FAIR Facility for Antiproton and Ion Research
  • University of Colorado Boulder
  • Ghent University
  • University of the Basque Country
  • Ikerbasque Basque Foundation for Science
  • Joint Institute for Nuclear Research
  • National Institute for Subatomic Physics
  • Andrzej Soltan Institute for Nuclear Studies
  • Stanford University
  • CSIRO
  • IRCCS Multimedica - Milano
  • IBA Dosimetry GmbH
  • Fermi National Accelerator Laboratory
  • Thomas Jefferson National Accelerator Facility

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

For the final running period of HERA, a recoil detector was installed at the HERMES experiment to improve measurements of hard exclusive processes in charged-lepton nucleon scattering. Here, deeply virtual Compton scattering is of particular interest as this process provides constraints on generalised parton distributions that give access to the total angular momenta of quarks within the nucleon. The HERMES recoil detector was designed to improve the selection of exclusive events by a direct measurement of the four-momentum of the recoiling particle. It consisted of three components: two layers of double-sided silicon strip sensors inside the HERA beam vacuum, a two-barrel scintillating fibre tracker, and a photon detector. All sub-detectors were located inside a solenoidal magnetic field with a field strength of 1T. The recoil detector was installed in late 2005. After the commissioning of all components was finished in September 2006, it operated stably until the end of data taking at HERA end of June 2007. The present paper gives a brief overview of the physics processes of interest and the general detector design. The recoil detector components, their calibration, the momentum reconstruction of charged particles, and the event selection are described in detail. The paper closes with a summary of the performance of the detection system.

Original languageEnglish
Article numberP05012
JournalJournal of Instrumentation
Volume8
Issue number5
DOIs
StatePublished - May 2013

Keywords

  • dE/dx detectors
  • Particle identification methods
  • Particle tracking detectors

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