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LIBRIS Formathandbok  (Information om MARC21)
00004946naa a22008533a 4500
008080901s2016 xx |||| |0|| 0|eng d
024a 10.1038/nature164912 doi
024a 267917252 pmid
024a urn:nbn:se:su:diva-1268942 urn
040 a (SwePub)su
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
072 7a ref2 swepub-contenttype
100a Ahmadi, M.4 aut0 (SwePub:)
2451 0a An improved limit on the charge of antihydrogen from stochastic acceleration
500 a Published
500 a 49
5208 enga <p>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(1-4) 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 vertical bar Q vertical bar &lt; 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(5) of the antihydrogen charge. The electrical charge of atoms and molecules of normal matter is known(6) to be no greater than about 10(-21)e for a diverse range of species including H-2, He and SF6. Charge-parity-time symmetry and quantum anomaly cancellation(7) 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(8), 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(8),(9).</p>
650 7a NATURVETENSKAPx Fysik2 hsv//swe0 (SwePub)103
650 7a NATURAL SCIENCESx Physical Sciences2 hsv//eng0 (SwePub)103
700a Baquero-Ruiz, M.4 aut0 (SwePub:)
700a Bertsche, W.4 aut0 (SwePub:)
700a Butler, E.4 aut0 (SwePub:)
700a Capra, A.4 aut0 (SwePub:)
700a Carruth, C.4 aut0 (SwePub:)
700a Cesar, C. L.4 aut0 (SwePub:)
700a Charlton, M.4 aut0 (SwePub:)
700a Charman, A. E.4 aut0 (SwePub:)
700a Eriksson, S.4 aut0 (SwePub:)
700a Evans, L. T.4 aut0 (SwePub:)
700a Evetts, N.4 aut0 (SwePub:)
700a Fajans, J.4 aut0 (SwePub:)
700a Friesen, T.4 aut0 (SwePub:)
700a Fujiwara, M. C.4 aut0 (SwePub:)
700a Gill, D. R.4 aut0 (SwePub:)
700a Gutierrez, A.4 aut0 (SwePub:)
700a Hangst, J. S.4 aut0 (SwePub:)
700a Hardy, W. N.4 aut0 (SwePub:)
700a Hayden, M. E.4 aut0 (SwePub:)
700a Isaac, C. A.4 aut0 (SwePub:)
700a Ishida, A.4 aut0 (SwePub:)
700a Jones, S. A.4 aut0 (SwePub:)
700a Jonsell, Svante,u Stockholms universitet, Fysikum4 aut0 (SwePub:su)
700a Kurchaninov, L.4 aut0 (SwePub:)
700a Madsen, N.4 aut0 (SwePub:)
700a Maxwell, D.4 aut0 (SwePub:)
700a McKenna, J. T. K.4 aut0 (SwePub:)
700a Menary, S.4 aut0 (SwePub:)
700a Michan, J. M.4 aut0 (SwePub:)
700a Momose, T.4 aut0 (SwePub:)
700a Munich, J. J.4 aut0 (SwePub:)
700a Nolan, P.4 aut0 (SwePub:)
700a Olchanski, K.4 aut0 (SwePub:)
700a Olin, A.4 aut0 (SwePub:)
700a Povilus, A.4 aut0 (SwePub:)
700a Pusa, P.4 aut0 (SwePub:)
700a Rasmussen, C. O.4 aut0 (SwePub:)
700a Robicheaux, F.4 aut0 (SwePub:)
700a Sacramento, R. L.4 aut0 (SwePub:)
700a Sameed, M.4 aut0 (SwePub:)
700a Sarid, E.4 aut0 (SwePub:)
700a Silveira, D. M.4 aut0 (SwePub:)
700a So, C.4 aut0 (SwePub:)
700a Tharp, T. D.4 aut0 (SwePub:)
700a Thompson, R. I.4 aut0 (SwePub:)
700a van der Werf, D. P.4 aut0 (SwePub:)
700a Wurtele, J. S.4 aut0 (SwePub:)
700a Zhmoginov, A. I.4 aut0 (SwePub:)
773t Naturex 0028-0836x 1476-4687g 529:7586, s. 373-+q 529:7586<373-+
8564 8u http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-126894y Till lärosätets (su) databasx lärosäteslänk
8564 8u http://dx.doi.org/10.1038/nature16491

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