Four ppm measurement of the antihydrogen ground-state hyperfine splitting.

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Title: Four ppm measurement of the antihydrogen ground-state hyperfine splitting.
Authors: Akbari R; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada., de Araujo Azevedo LO; Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Baker CJ; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Bertsche W; School of Physics and Astronomy, University of Manchester, Manchester, UK.; Cockcroft Institute, Sci-Tech Daresbury, Warrington, UK., Bhatt NM; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK.; TRIUMF, Vancouver, British Columbia, Canada., Bonomi G; University of Brescia, Brescia, Italy.; INFN Sezione di Pavia, Pavia, Italy., Capra A; TRIUMF, Vancouver, British Columbia, Canada., Carli I; TRIUMF, Vancouver, British Columbia, Canada., L Cesar C; Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Charlton M; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Cridland Mathad A; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK.; Experimental Physics Department, CERN, Geneva, Switzerland., Del Vincio A; University of Brescia, Brescia, Italy.; INFN Sezione di Pavia, Pavia, Italy.; University of Trento, Trento, Italy., Duque Quiceno D; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; TRIUMF, Vancouver, British Columbia, Canada., Eriksson S; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Evans A; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; TRIUMF, Vancouver, British Columbia, Canada., Fajans J; Department of Physics, University of California at Berkeley, Berkeley, CA, USA., Friesen T; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada. timothy.friesen@ucalgary.ca., Fujiwara MC; TRIUMF, Vancouver, British Columbia, Canada.; WPI-QUP, KEK, Tsukuba, Japan., Golino LM; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Gomes Gonçalves MB; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Hangst JS; Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark. jeffrey.hangst@cern.ch., Hayden ME; Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada., Heidari P; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Hodgkinson D; Department of Physics, University of California at Berkeley, Berkeley, CA, USA., Isaac CA; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Jones SA; Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Groningen, The Netherlands., Jonsell S; Department of Physics, Stockholm University, Stockholm, Sweden., Madsen N; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Marshall VR; Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark., McKenna JTK; School of Physics and Astronomy, University of Manchester, Manchester, UK., Momose T; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; TRIUMF, Vancouver, British Columbia, Canada.; Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada., Nauta J; Experimental Physics Department, CERN, Geneva, Switzerland., Oliveira AN; School of Physics and Astronomy, University of Manchester, Manchester, UK., Powell A; Experimental Physics Department, CERN, Geneva, Switzerland.; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Rasmussen CØ; Experimental Physics Department, CERN, Geneva, Switzerland.; Physics Department, Brookhaven National Laboratory, Upton, NY, USA., Robertson-Brown T; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Robicheaux F; Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA., Sacramento RL; Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Sarid E; Ben Gurion University of the Negev, Be'er Sheva, Israel.; Soreq NRC, Yavne, Israel., Schoonwater J; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Silveira DM; Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Singh J; School of Physics and Astronomy, University of Manchester, Manchester, UK., Smith G; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; TRIUMF, Vancouver, British Columbia, Canada., So C; TRIUMF, Vancouver, British Columbia, Canada., Stracka S; INFN Sezione di Pisa, Pisa, Italy., Suh J; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Swadling AG; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Tharp TD; Physics Department, Marquette University, Milwaukee, WI, USA., Thompson KA; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Thompson RI; TRIUMF, Vancouver, British Columbia, Canada.; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Thorpe-Woods E; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Uribe Jimenez AJ; TRIUMF, Vancouver, British Columbia, Canada. alberto.jesus.uribe.jimenez@cern.ch.; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada. alberto.jesus.uribe.jimenez@cern.ch., Urioni M; University of Brescia, Brescia, Italy.; INFN Sezione di Pavia, Pavia, Italy., van de Werf DP; Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea, UK., Wilson SG; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Woosaree P; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada., Wurtele JS; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
Corporate Authors: ALPHA Collaboration
Source: Nature [Nature] 2026 May; Vol. 653 (8116), pp. 1022-1026. Date of Electronic Publication: 2026 May 27.
Publication Type: Journal Article
Journal Info: Publisher: Nature Publishing Group Country of Publication: England NLM ID: 0410462 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4687 (Electronic) Linking ISSN: 00280836 NLM ISO Abbreviation: Nature Subsets: MEDLINE; PubMed not MEDLINE
Database: MEDLINE Ultimate
Description
ISSN:1476-4687
DOI:10.1038/s41586-026-10556-x