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Ahmadi M, Baquero-Ruiz M, Bertsche W, et al. An improved limit on the charge of antihydrogen from stochastic acceleration. Nature. 2016;529(7586):373-6doi: 10.1038/nature16491.
Ahmadi, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C. L., Charlton, M., Charman, A. E., Eriksson, S., Evans, L. T., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Isaac, C. A., Ishida, A., Jones, S. A., Jonsell, S., Kurchaninov, L., Madsen, N., Maxwell, D., McKenna, J. T., Menary, S., Michan, J. M., Momose, T., Munich, J. J., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Rasmussen, C. �. �., Robicheaux, F., Sacramento, R. L., Sameed, M., Sarid, E., Silveira, D. M., So, C., Tharp, T. D., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., & Zhmoginov, A. I. (2016). An improved limit on the charge of antihydrogen from stochastic acceleration. Nature, 529(7586), 373-6. https://doi.org/10.1038/nature16491
Ahmadi, M, et al. "An improved limit on the charge of antihydrogen from stochastic acceleration." Nature vol. 529,7586 (2016): 373-6. doi: https://doi.org/10.1038/nature16491
Ahmadi M, Baquero-Ruiz M, Bertsche W, Butler E, Capra A, Carruth C, Cesar CL, Charlton M, Charman AE, Eriksson S, Evans LT, Evetts N, Fajans J, Friesen T, Fujiwara MC, Gill DR, Gutierrez A, Hangst JS, Hardy WN, Hayden ME, Isaac CA, Ishida A, Jones SA, Jonsell S, Kurchaninov L, Madsen N, Maxwell D, McKenna JT, Menary S, Michan JM, Momose T, Munich JJ, Nolan P, Olchanski K, Olin A, Povilus A, Pusa P, Rasmussen CØ, Robicheaux F, Sacramento RL, Sameed M, Sarid E, Silveira DM, So C, Tharp TD, Thompson RI, van der Werf DP, Wurtele JS, Zhmoginov AI. An improved limit on the charge of antihydrogen from stochastic acceleration. Nature. 2016 Jan 21;529(7586):373-6. doi: 10.1038/nature16491. PMID: 26791725.
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Nature. 2016 Jan 21;529(7586):373-6. doi: 10.1038/nature16491.

An improved limit on the charge of antihydrogen from stochastic acceleration.

Nature

M Ahmadi, M Baquero-Ruiz, W Bertsche, E Butler, A Capra, C Carruth, C L Cesar, M Charlton, A E Charman, S Eriksson, L T Evans, N Evetts, J Fajans, T Friesen, M C Fujiwara, D R Gill, A Gutierrez, J S Hangst, W N Hardy, M E Hayden, C A Isaac, A Ishida, S A Jones, S Jonsell, L Kurchaninov, N Madsen, D Maxwell, J T K McKenna, S Menary, J M Michan, T Momose, J J Munich, P Nolan, K Olchanski, A Olin, A Povilus, P Pusa, C Ø Rasmussen, F Robicheaux, R L Sacramento, M Sameed, E Sarid, D M Silveira, C So, T D Tharp, R I Thompson, D P van der Werf, J S Wurtele, A I Zhmoginov

Affiliations

  1. Department of Physics, University of Liverpool, Liverpool L697ZE, UK.
  2. Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA.
  3. Centre de Recherches en Physique des Plasmas (CRPP), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
  4. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
  5. Cockcroft Institute, Sci-Tech Daresbury, Warrington WA4 4AD, UK.
  6. Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK.
  7. Physics Department, European Organisation for Nuclear Research (CERN), CH-1211 Geneva 23, Switzerland.
  8. Department of Physics and Astronomy, York University, Toronto, Ontario M3J 1P3, Canada.
  9. Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil.
  10. Department of Physics, Swansea University, Swansea SA2 8PP, UK.
  11. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
  12. Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
  13. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  14. Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
  15. Department of Physics, Stockholm University, SE-10691, Stockholm, Sweden.
  16. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
  17. Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada.
  18. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
  19. Soreq Nuclear Research Center, Yavne, 81800, Israel.
  20. Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
  21. ATAP, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

PMID: 26791725 DOI: 10.1038/nature16491

Abstract

Antimatter continues to intrigue physicists because of its apparent absence in the observable Universe. Current theory requires that matter and antimatter appeared in equal quantities after the Big Bang, but the Standard Model of particle physics offers no quantitative explanation for the apparent disappearance of half the Universe. It has recently become possible to study trapped atoms of antihydrogen to search for possible, as yet unobserved, differences in the physical behaviour of matter and antimatter. Here we consider the charge neutrality of the antihydrogen atom. By applying stochastic acceleration to trapped antihydrogen atoms, we determine an experimental bound on the antihydrogen charge, Qe, of |Q| < 0.71 parts per billion (one standard deviation), in which e is the elementary charge. This bound is a factor of 20 less than that determined from the best previous measurement of the antihydrogen charge. The electrical charge of atoms and molecules of normal matter is known to be no greater than about 10(-21)e for a diverse range of species including H2, He and SF6. Charge-parity-time symmetry and quantum anomaly cancellation demand that the charge of antihydrogen be similarly small. Thus, our measurement constitutes an improved limit and a test of fundamental aspects of the Standard Model. If we assume charge superposition and use the best measured value of the antiproton charge, then we can place a new limit on the positron charge anomaly (the relative difference between the positron and elementary charge) of about one part per billion (one standard deviation), a 25-fold reduction compared to the current best measurement.

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