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An experimental limit on the charge of antihydrogen

C. Amole, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, E. Butler, A. Capra, C. L. Cesar, M. Charlton, S. Eriksson, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, A. Gutierrez, J. S. Hangst, W. N. Hardy, M. E. Hayden, C. A. Isaac, S. Jonsell, L. Kurchaninov, A. Little, N. Madsen, J. T. K. McKenna, S. Menary, S. C. Napoli, P. Nolan, K. Olchanski, A. Olin, A. Povilus, P. Pusa, C.Ø. Rasmussen, F. Robicheaux, E. Sarid, D. M. Silveira, C. So, T. D. Tharp, R. I. Thompson, D. P. van der Werf, Z. Vendeiro, J. S. Wurtele, A. I. Zhmoginov, A. E. Charman, Michael Charlton, Dirk van der Werf Orcid Logo, Niels Madsen Orcid Logo, Aled Isaac Orcid Logo, Stefan Eriksson

Nature Communications, Volume: 5, Start page: 3955

Swansea University Authors: Michael Charlton, Dirk van der Werf Orcid Logo, Niels Madsen Orcid Logo, Aled Isaac Orcid Logo, Stefan Eriksson

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DOI (Published version): 10.1038/ncomms4955

Abstract

The properties of antihydrogen are expected to be identical to those of hydrogen, and any differences would constitute a profound challenge to the fundamental theories of physics. The most commonly discussed antiatom-based tests of these theories are searches for antihydrogen-hydrogen spectral diffe...

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Published in: Nature Communications
ISSN: 2041-1723
Published: 2014
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa18032
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Abstract: The properties of antihydrogen are expected to be identical to those of hydrogen, and any differences would constitute a profound challenge to the fundamental theories of physics. The most commonly discussed antiatom-based tests of these theories are searches for antihydrogen-hydrogen spectral differences (tests of CPT (charge-parity-time) invariance) or gravitational differences (tests of the weak equivalence principle). Here we, the ALPHA Collaboration, report a different and somewhat unusual test of CPT and of quantum anomaly cancellation. A retrospective analysis of the influence of electric fields on antihydrogen atoms released from the ALPHA trap finds a mean axial deflection of 4.1±3.4 mm for an average axial electric field of 0.51 V mm−1. Combined with extensive numerical modelling, this measurement leads to a bound on the charge Qe of antihydrogen of Q=(−1.3±1.1±0.4) × 10^−8. Here, e is the unit charge, and the errors are from statistics and systematic effects.
Keywords: Antihydrogen, ALPHA
College: College of Science
Start Page: 3955