M. Charlton³, R. Collister⁶, S. Eriksson³, A. Evans^10,11, N. Evetts¹¹, J. Fajans^8,†, T. Friesen^10,2, M. C. Fujiwara⁶, P. Granum², J. S. Hangst², M. E. Hayden¹², D. Hodgkinson^4,8,‡, C. A. Isaac³, M. A. Johnson^4,5, S. A. Jones^3,13, S. Jonsell¹⁴, N. Kalem⁸, N. Madsen³, D. Maxwell³, J. T. K. McKenna^6,2,4, S. Menary¹⁵, T. Momose^11,6, J. Munich¹², K. Olchanski⁶, A. Olin^6,16, P. Pusa¹, C. Ø. Rasmussen^2,17, F. Robicheaux¹⁸, R. L. Sacramento⁹, M. Sameed^4,17, E. Sarid^19,7, D. M. Silveira⁹, C. So^10,6, G. Stutter², T. D. Tharp²⁰, R. I. Thompson^10,6, D. P. van der Werf³, and J. S. Wurtele⁸ (The ALPHA Collaboration)

• ¹Department of Physics, University of Liverpool, Liverpool L3 5TR, United Kingdom
• ²Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
• ³Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea SA2 8PP, United Kingdom
• ⁴School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
• ⁵Cockcroft Institute, Sci-Tech Daresbury, Warrington WA4 4AD, United Kingdom
• ⁶TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
• ⁷Department of Physics, Ben Gurion University, Beer Sheva 8410501, Israel
• ⁸Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA
• ⁹Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil
• ¹⁰Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada T2N 1N4
• ¹¹Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
• ¹²Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
• ¹³Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, NL-9747 AG Groningen, The Netherlands
• ¹⁴Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden
• ¹⁵Department of Physics and Astronomy, York University, Toronto, Ontario, Canada M3J 1P3
• ¹⁶Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada V8P 5C2
• ¹⁷CERN, Experimental Physics Department, CH-1211 Genève 23, Switzerland
• ¹⁸Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
• ¹⁹Soreq NRC, Yavne 81800, Israel
• ²⁰Physics Department, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201-1881, USA

• ^*Contact author: william.bertsche@manchester.ac.uk
• ^†Contact author: joelfajans@gmail.com
• ^‡Contact author: danielle.louise.hodgkinson@cern.ch