The HERMES Recoil Detector
A. Airapetian, E. C. Aschenauer, S. Belostotski, A. Borissov, 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. D\"uren, M. Ehrenfried

TL;DR
The HERMES recoil detector was developed to enhance the measurement of exclusive processes in lepton-nucleon scattering, particularly for studying generalized parton distributions and quark angular momentum, by directly measuring recoiling particles.
Contribution
This paper introduces the design, calibration, and performance of the HERMES recoil detector, a novel system for improved event selection in exclusive scattering experiments at HERA.
Findings
Successful installation and stable operation from 2006 to 2007
Enhanced event selection accuracy for deeply virtual Compton scattering
Detailed calibration and momentum reconstruction achieved
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…
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