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An experimental limit on the charge of antihydrogen
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Number of Authors: 42
2014 (English)In: Nature Communications, ISSN 2041-1723, Vol. 5, 3955- p.Article in journal (Refereed) Published
Abstract [en]

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 +/- 3.4mm for an average axial electric field of 0.51Vmm1. 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.

Place, publisher, year, edition, pages
2014. Vol. 5, 3955- p.
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Physical Sciences
URN: urn:nbn:se:su:diva-106604DOI: 10.1038/ncomms4955ISI: 000338834000002OAI: diva2:737651


Available from: 2014-08-13 Created: 2014-08-12 Last updated: 2014-08-13Bibliographically approved

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Jonsell, Svante
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