Characterization of muon and electron beams in the Paul Scherrer Institute PiM1 channel for the MUSE experiment

E. Cline*, W. Lin, P. Roy, P. E. Reimer, K. E. Mesick, A. Akmal, A. Alie, H. Atac, A. Atencio, C. Ayerbe Gayoso, N. Benmouna, F. Benmokhtar, J. C. Bernauer, W. J. Briscoe, J. Campbell, D. Cohen, E. O. Cohen, C. Collicott, K. Deiters, S. DograE. Downie, I. P. Fernando, A. Flannery, T. Gautam, D. Ghosal, R. Gilman, A. Golossanov, B. F. Halter, J. Hirschman, Y. Ilieva, M. Kim, M. Kohl, B. Krusche, I. Lavrukhin, L. Li, B. Liang-Gilman, A. Liyanage, W. Lorenzon, P. Mohanmurthy, R. Mokal, P. Moran, S. J. Nazeer, P. Or, T. Patel, E. Piasetzky, T. Rauber, R. S. Raymond, D. Reggiani, H. Reid, G. Ron, E. Rooney, T. Rostomyan, M. Schwarz, A. Sneath, P. G. Solazzo, N. Sparveris, N. Steinberg, S. Strauch, V. Sulkosky, N. Wuerfel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via simultaneous measurements of elastic muon-proton and electron-proton scattering. The experiment uses the PiM1 secondary beam channel, which was designed for high precision pion scattering measurements. We review the properties of the beam line established for pions. We discuss the production processes that generate the electron and muon beams, and the simulations of these processes. Simulations of the π/μ/e beams through the channel using TURTLE and G4beamline are compared. The G4beamline simulation is then compared to several experimental measurements of the channel, including the momentum dispersion at the intermediate focal plane and target, the shape of the beam spot at the target, and timing measurements that allow the beam momenta to be determined. We conclude that the PiM1 channel can be used for high precision π, μ, and e scattering.

Original languageEnglish
Article number055201
JournalPhysical Review C
Issue number5
StatePublished - May 2022


FundersFunder number
National Science Foundation1649873, 1812402, 1614773, 1614850, 1913653, 1614456, 1505934, 1812382, 1614938, 1807338, 1649909, 2012940, 1436680, 2012114
U.S. Department of EnergyDE-SC0012589, DE-SC0016583, DE-FG02-94ER40818, DE-AC02-06CH11357, DE-SC0012485, DE-SC0016577
Bloom's Syndrome Foundation2017673, 2017630, 2012032
Spine Education and Research InstituteFCS 2015.0594
Sigma XiaG2017100190747806, G2019100190747806
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung132799, 121781, 117601, 200020-156983
United States-Israel Binational Science Foundation
Paul Scherrer Institut
Azrieli Foundation
Staatssekretariat für Bildung, Forschung und Innovation


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