The HERMES Recoil Detector
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 an integrated field strength of 1 T. 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.
Cite
@article{arxiv.1302.6092,
title = {The HERMES Recoil Detector},
author = {A. Airapetian and E. C. Aschenauer and S. Belostotski and A. Borissov and A. Borisenko and J. Bowles and I. Brodski and V. Bryzgalov and J. Burns and G. P. Capitani and V. Carassiti and G. Ciullo and A. Clarkson and M. Contalbrigo and R. De Leo and E. De Sanctis and M. Diefenthaler and P. Di Nezza and M. Düren and M. Ehrenfried and H. Guler and I. M. Gregor and M. Hartig and G. Hill and M. Hoek and Y. Holler and I. Hristova and H. S. Jo and R. Kaiser and T. Keri and A. Kisselev and B. Krause and B. Krauss and L. Lagamba and I. Lehmann and P. Lenisa and S. Lu and X. -G. Lu and S. Lumsden and D. Mahon and A. Martinez de la Ossa and M. Murray and A. Mussgiller and W. -D. Nowak and Y. Naryshkin and A. Osborne and L. L. Pappalardo and R. Perez-Benito and A. Petrov and N. Pickert and V. Prahl and D. Protopopescu and M. Reinecke and C. Riedl and K. Rith and G. Rosner and L. Rubacek and D. Ryckbosch and Y. Salomatin and G. Schnell and B. Seitz and C. Shearer and V. Shutov and M. Statera and J. J. M. Steijger and H. Stenzel and J. Stewart and F. Stinzing and A. Trzcinski and M. Tytgat and A. Vandenbroucke and Y. Van Haarlem and C. Van Hulse and M. Varanda and D. Veretennikov and I. Vilardi and V. Vikhrov and C. Vogel and S. Yaschenko and Z. Ye and W. Yu and D. Zeiler and B. Zihlmann},
journal= {arXiv preprint arXiv:1302.6092},
year = {2015}
}
Comments
50 pages, 72 figures