CERN Accelerating science

Article
Report number	arXiv:2305.19411 ; CERN-EP-2023-108
Title	Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^{+}/e^{-}$ beam at CERN
Author(s)	Andreev, Yu.M. (Unlisted) ; Banerjee, D. (CERN) ; Oberhauser, B. Banto (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (INFN, Genoa ; Genoa U.) ; Bondí, M. (INFN, Catania) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Unlisted) ; Cooke, D. (University Coll. London) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Unlisted) ; Donskov, S.V. (Unlisted) ; Dusaev, R.R. (Unlisted) ; Enik, T. (Unlisted) ; Frolov, V.N. (Unlisted) ; Gardikiotis, A. (Patras U.) ; Gerassimov, S.G. (Unlisted ; Munich, Tech. U.) ; Gninenko, S.N. (Unlisted) ; Hösgen, M. (Bonn U.) ; Jeckel, M. (CERN) ; Kachanov, V.A. (Unlisted) ; Kambar, Y. (Unlisted) ; Karneyeu, A.E. (Unlisted) ; Kekelidze, G. (Unlisted) ; Ketzer, B. (Bonn U.) ; Kirpichnikov, D.V. (Unlisted) ; Kirsanov, M.M. (Unlisted) ; Kolosov, V.N. (Unlisted) ; Konorov, I.V. (Munich, Tech. U.) ; Gertsenberger, S.V. (Unlisted) ; Kasianova, E.A. (Unlisted) ; Kovalenko, S.G. (Unlisted, CL ; Andres Bello Natl. U.) ; Kramarenko, V.A. (Unlisted) ; Kravchuk, L.V. (Unlisted) ; Krasnikov, N.V. (Unlisted) ; Kuleshov, S.V. (Unlisted, CL ; Andres Bello Natl. U.) ; Lyubovitskij, V.E. (Unlisted ; Santa Maria U., Valparaiso ; Andres Bello Natl. U.) ; Lysan, V. (Unlisted) ; Marini, A. (INFN, Genoa) ; Marsicano, L. (INFN, Genoa) ; Matveev, V.A. (Unlisted) ; Mikhailov, Yu.V. (Unlisted) ; Bueno, L. Molina (Valencia U., IFIC) ; Mongillo, M. (Zurich, ETH) ; Peshekhonov, D.V. (Unlisted) ; Polyakov, V.A. (Unlisted) ; Radics, B. (York U., Canada) ; Rojas, R. (Santa Maria U., Valparaiso) ; Salamatin, K. (Unlisted) ; Samoylenko, V.D. (Unlisted) ; Sieber, H. (Zurich, ETH) ; Shchukin, D. (Unlisted) ; Soto, O. (La Serena U. ; Andres Bello Natl. U.) ; Tikhomirov, V.O. (Unlisted) ; Tlisova, I. (Unlisted) ; Toropin, A.N. (Unlisted) ; Trifonov, A.Yu. (Unlisted) ; Tuzi, M. (Valencia U., IFIC) ; Ulloa, P. (Unlisted, CL) ; Vasilishin, B.I. (Unlisted) ; Arenas, G. Vasquez (Santa Maria U., Valparaiso) ; Volkov, P.V. (Unlisted) ; Volkov, V.Yu. (Unlisted) ; Voronchikhin, I.V. (Unlisted) ; Zamora-Saá, J. (Unlisted, CL ; Andres Bello Natl. U.) ; Zhevlakov, A.S. (Unlisted)
Corporate author(s)	The NA64 collaboration
Publication	2023-10-12
Imprint	27 May 2023
Number of pages	8
Published in:	Nucl. Instrum. Methods Phys. Res., A 1057 (2023) 168776
DOI	10.1016/j.nima.2023.168776
Subject category	Particle Physics - Experiment ; Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN SPS ; NA64
Keywords	detector ; particle identification ; calorimeter ; test beam ; experimental results
Abstract	In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. Our study is based on calorimetric measurements, exploiting the different interaction mechanisms of electrons and hadrons in the NA64-ECAL and NA64-HCAL detectors. We determined the intrinsic hadronic contamination by comparing the results obtained using the nominal electron/positron beamline configuration with those obtained in a dedicated setup, in which only hadrons impinged on the detector. The significant differences in the experimental signatures of electrons and hadrons motivated our approach, resulting in a small and well-controlled systematic uncertainty for the measurement. Our study allowed us to precisely determine the intrinsic hadronic contamination, which represents a crucial parameter for the NA64 experiment in which the hadron contaminants may result in non-trivial backgrounds. Moreover, we performed dedicated Monte Carlo simulations for the hadron production induced by the primary T2 target. We found a good agreement between measurements and simulation results, confirming the validity of the applied methodology and our evaluation of the intrinsic hadronic contamination.
Other source	Inspire
Copyright/License	Preprint: © 2023-2024 CERN (License: CC-BY-4.0) Publication: © 2023-2024 The Author(s) (License: CC BY 4.0)
Submitted by	andrea.celentano@cern.ch