First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment

Adams, D.; Adey, D.; Asfandiyarov, R.; Barber, G.; De Bari, A.; Bayes, R.; Bayliss, V.; Bertoni, R.; Blackmore, V.; Blondel, A.; Boehm, J.; Bogomilov, M.; Bonesini, M.; Booth, C. N.; Bowring, D.; Boyd, S.; Bradshaw, T. W.; Bross, A. D.; Brown, C.; Charnley, G.; Chatzitheodoridis, G. T.; Chignoli, F.; Chung, M.; Cline, D.; Cobb, J. H.; Colling, D.; Collomb, N.; Cooke, P.; Courthold, M.; Cremaldi, L. M.; Demello, A.; Dick, A. J.; Dobbs, A.; Dornan, P.; Drielsma, F.; Dumbell, K.; Ellis, M.; Filthaut, F.; Franchini, P.; Freemire, B.; Gallagher, A.; Gamet, R.; Gardener, R. B. S.; Gourlay, S.; Grant, A.; Greis, J. R.; Griffiths, S.; Hanlet, P.; Hanson, G. G.; Hartnett, T.; Heidt, C.; Hodgson, P.; Hunt, C.; Ishimoto, S.; Jokovic, D.; Jurj, P. B.; Kaplan, D. M.; Karadzhov, Y.; Klier, A.; Kuno, Y.; Kurup, A.; Kyberd, P.; Lagrange, J. -B.; Langlands, J.; Lau, W.; Li, D.; Li, Z.; Liu, A.; Long, K.; Lord, T.; Macwaters, C.; Maletic, D.; Martlew, B.; Martyniak, J.; Mazza, R.; Middleton, S.; Mohayai, T. A.; Moss, A.; Muir, A.; Mullacrane, I.; Nebrensky, J. J.; Neuffer, D.; Nichols, A.; Nugent, J. C.; Oates, A.; Orestano, D.; Overton, E.; Owens, P.; Palladino, V.; Palmer, M.; Pasternak, J.; Pec, V.; Pidcott, C.; Popovic, M.; Preece, R.; Prestemon, S.; Rajaram, D.; Ricciardi, S.; Robinson, M.; Rogers, C.; Ronald, K.; Rubinov, P.; Sakamoto, H.; Sanders, D. A.; Sato, A.; Savic, M.; Snopok, P.; Smith, P. J.; Soler, F. J. P.; Song, Y.; Stanley, T.; Stokes, G.; Suezaki, V.; Summers, D. J.; Sung, C. K.; Tang, J.; Tarrant, J.; Taylor, I.; Tortora, L.; Torun, Y.; Tsenov, R.; Tucker, M.; Uchida, M. A.; Virostek, S.; Vankova-Kirilova, G.; Warburton, P.; Wilbur, S.; Wilson, A.; Witte, H.; White, C.; Whyte, C. G.; Yang, X.; Young, A. R.; Zisman, M.

doi:10.1140/epjc/s10052-019-6674-y

The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future neutrino factory or muon collider. The emittance is measured from an ensemble of muons assembled from those that pass through the experiment. A pure muon ensemble is selected using a particle-identification system that can reject efficiently both pions and electrons. The position and momentum of each muon are measured using a high-precision scintillating-fibre tracker in a 4T solenoidal magnetic field. This paper presents the techniques used to reconstruct the phase-space distributions in the upstream tracking detector and reports the first particle-by-particle measurement of the emittance of the MICE Muon Beam as a function of muon-beam momentum.