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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; Niels Madsen; Aled Isaac; Stefan Eriksson
Nature Communications, Volume: 5, Start page: 3955
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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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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.
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