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An improved limit on the charge of antihydrogen from stochastic acceleration

M. Ahmadi, M. Baquero-Ruiz, W. Bertsche, E. Butler, A. Capra, C. Carruth, C. L. Cesar, A. E. Charman, 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, A. Ishida, S. A. Jones, S. Jonsell, L. Kurchaninov, 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, Michael Charlton, Dirk van der Werf Orcid Logo, Niels Madsen Orcid Logo, Aled Isaac Orcid Logo, Stefan Eriksson Orcid Logo

Nature, Volume: 529, Issue: 7586, Pages: 373 - 376

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

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DOI (Published version): 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 d...

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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2020-05-26T15:56:12.9922063</datestamp><bib-version>v2</bib-version><id>25943</id><entry>2016-01-21</entry><title>An improved limit on the charge of antihydrogen from stochastic acceleration</title><swanseaauthors><author><sid>d9099cdd0f182eb9a1c8fc36ed94f53f</sid><firstname>Michael</firstname><surname>Charlton</surname><name>Michael Charlton</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>4a4149ebce588e432f310f4ab44dd82a</sid><ORCID>0000-0001-5436-5214</ORCID><firstname>Dirk</firstname><surname>van der Werf</surname><name>Dirk van der Werf</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>e348e4d768ee19c1d0c68ce3a66d6303</sid><ORCID>0000-0002-7372-0784</ORCID><firstname>Niels</firstname><surname>Madsen</surname><name>Niels Madsen</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>06d7ed42719ef7bb697cf780c63e26f0</sid><ORCID>0000-0002-7813-1903</ORCID><firstname>Aled</firstname><surname>Isaac</surname><name>Aled Isaac</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>785cbd474febb1bfa9c0e14abaf9c4a8</sid><ORCID>0000-0002-5390-1879</ORCID><firstname>Stefan</firstname><surname>Eriksson</surname><name>Stefan Eriksson</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2016-01-21</date><deptcode>FGSEN</deptcode><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|&#x2009;&lt;&#x2009;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 known6 to be no greater than about 10&#x2212;21e for a diverse range of species including H2, He and SF6. Charge&#x2013;parity&#x2013;time symmetry and quantum anomaly cancellation7 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 charge8, 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.</abstract><type>Journal Article</type><journal>Nature</journal><volume>529</volume><journalNumber>7586</journalNumber><paginationStart>373</paginationStart><paginationEnd>376</paginationEnd><publisher/><keywords>Antihydrogen, Antimatter, ALPHA</keywords><publishedDay>20</publishedDay><publishedMonth>1</publishedMonth><publishedYear>2016</publishedYear><publishedDate>2016-01-20</publishedDate><doi>10.1038/nature16491</doi><url/><notes/><college>COLLEGE NANME</college><department>Science and Engineering - Faculty</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>FGSEN</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-05-26T15:56:12.9922063</lastEdited><Created>2016-01-21T07:12:15.2679422</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Physics</level></path><authors><author><firstname>M.</firstname><surname>Ahmadi</surname><order>1</order></author><author><firstname>M.</firstname><surname>Baquero-Ruiz</surname><order>2</order></author><author><firstname>W.</firstname><surname>Bertsche</surname><order>3</order></author><author><firstname>E.</firstname><surname>Butler</surname><order>4</order></author><author><firstname>A.</firstname><surname>Capra</surname><order>5</order></author><author><firstname>C.</firstname><surname>Carruth</surname><order>6</order></author><author><firstname>C. L.</firstname><surname>Cesar</surname><order>7</order></author><author><firstname>A. E.</firstname><surname>Charman</surname><order>8</order></author><author><firstname>L. T.</firstname><surname>Evans</surname><order>9</order></author><author><firstname>N.</firstname><surname>Evetts</surname><order>10</order></author><author><firstname>J.</firstname><surname>Fajans</surname><order>11</order></author><author><firstname>T.</firstname><surname>Friesen</surname><order>12</order></author><author><firstname>M. C.</firstname><surname>Fujiwara</surname><order>13</order></author><author><firstname>D. R.</firstname><surname>Gill</surname><order>14</order></author><author><firstname>A.</firstname><surname>Gutierrez</surname><order>15</order></author><author><firstname>J. S.</firstname><surname>Hangst</surname><order>16</order></author><author><firstname>W. N.</firstname><surname>Hardy</surname><order>17</order></author><author><firstname>M. E.</firstname><surname>Hayden</surname><order>18</order></author><author><firstname>A.</firstname><surname>Ishida</surname><order>19</order></author><author><firstname>S. A.</firstname><surname>Jones</surname><order>20</order></author><author><firstname>S.</firstname><surname>Jonsell</surname><order>21</order></author><author><firstname>L.</firstname><surname>Kurchaninov</surname><order>22</order></author><author><firstname>D.</firstname><surname>Maxwell</surname><order>23</order></author><author><firstname>J. T. K.</firstname><surname>McKenna</surname><order>24</order></author><author><firstname>S.</firstname><surname>Menary</surname><order>25</order></author><author><firstname>J. M.</firstname><surname>Michan</surname><order>26</order></author><author><firstname>T.</firstname><surname>Momose</surname><order>27</order></author><author><firstname>J. J.</firstname><surname>Munich</surname><order>28</order></author><author><firstname>P.</firstname><surname>Nolan</surname><order>29</order></author><author><firstname>K.</firstname><surname>Olchanski</surname><order>30</order></author><author><firstname>A.</firstname><surname>Olin</surname><order>31</order></author><author><firstname>A.</firstname><surname>Povilus</surname><order>32</order></author><author><firstname>P.</firstname><surname>Pusa</surname><order>33</order></author><author><firstname>C. &#xD8;.</firstname><surname>Rasmussen</surname><order>34</order></author><author><firstname>F.</firstname><surname>Robicheaux</surname><order>35</order></author><author><firstname>R. L.</firstname><surname>Sacramento</surname><order>36</order></author><author><firstname>M.</firstname><surname>Sameed</surname><order>37</order></author><author><firstname>E.</firstname><surname>Sarid</surname><order>38</order></author><author><firstname>D. M.</firstname><surname>Silveira</surname><order>39</order></author><author><firstname>C.</firstname><surname>So</surname><order>40</order></author><author><firstname>T. D.</firstname><surname>Tharp</surname><order>41</order></author><author><firstname>R. I.</firstname><surname>Thompson</surname><order>42</order></author><author><firstname>D. P. van der</firstname><surname>Werf</surname><order>43</order></author><author><firstname>J. S.</firstname><surname>Wurtele</surname><order>44</order></author><author><firstname>A. 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spelling 2020-05-26T15:56:12.9922063 v2 25943 2016-01-21 An improved limit on the charge of antihydrogen from stochastic acceleration d9099cdd0f182eb9a1c8fc36ed94f53f Michael Charlton Michael Charlton true false 4a4149ebce588e432f310f4ab44dd82a 0000-0001-5436-5214 Dirk van der Werf Dirk van der Werf true false e348e4d768ee19c1d0c68ce3a66d6303 0000-0002-7372-0784 Niels Madsen Niels Madsen true false 06d7ed42719ef7bb697cf780c63e26f0 0000-0002-7813-1903 Aled Isaac Aled Isaac true false 785cbd474febb1bfa9c0e14abaf9c4a8 0000-0002-5390-1879 Stefan Eriksson Stefan Eriksson true false 2016-01-21 FGSEN 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 known6 to be no greater than about 10−21e for a diverse range of species including H2, He and SF6. Charge–parity–time symmetry and quantum anomaly cancellation7 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 charge8, 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. Journal Article Nature 529 7586 373 376 Antihydrogen, Antimatter, ALPHA 20 1 2016 2016-01-20 10.1038/nature16491 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2020-05-26T15:56:12.9922063 2016-01-21T07:12:15.2679422 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics M. Ahmadi 1 M. Baquero-Ruiz 2 W. Bertsche 3 E. Butler 4 A. Capra 5 C. Carruth 6 C. L. Cesar 7 A. E. Charman 8 L. T. Evans 9 N. Evetts 10 J. Fajans 11 T. Friesen 12 M. C. Fujiwara 13 D. R. Gill 14 A. Gutierrez 15 J. S. Hangst 16 W. N. Hardy 17 M. E. Hayden 18 A. Ishida 19 S. A. Jones 20 S. Jonsell 21 L. Kurchaninov 22 D. Maxwell 23 J. T. K. McKenna 24 S. Menary 25 J. M. Michan 26 T. Momose 27 J. J. Munich 28 P. Nolan 29 K. Olchanski 30 A. Olin 31 A. Povilus 32 P. Pusa 33 C. Ø. Rasmussen 34 F. Robicheaux 35 R. L. Sacramento 36 M. Sameed 37 E. Sarid 38 D. M. Silveira 39 C. So 40 T. D. Tharp 41 R. I. Thompson 42 D. P. van der Werf 43 J. S. Wurtele 44 A. I. Zhmoginov 45 Michael Charlton 46 Dirk van der Werf 0000-0001-5436-5214 47 Niels Madsen 0000-0002-7372-0784 48 Aled Isaac 0000-0002-7813-1903 49 Stefan Eriksson 0000-0002-5390-1879 50 0025943-17052016102553.pdf nature16491VOR.pdf 2016-05-17T10:25:53.3300000 Output 657261 application/pdf Version of Record true 2016-05-17T00:00:00.0000000 This work is licensed under a Creative Commons AttributionNonCommercial-ShareAlike 3.0 Unported licence. true
title An improved limit on the charge of antihydrogen from stochastic acceleration
spellingShingle An improved limit on the charge of antihydrogen from stochastic acceleration
Michael Charlton
Dirk van der Werf
Niels Madsen
Aled Isaac
Stefan Eriksson
title_short An improved limit on the charge of antihydrogen from stochastic acceleration
title_full An improved limit on the charge of antihydrogen from stochastic acceleration
title_fullStr An improved limit on the charge of antihydrogen from stochastic acceleration
title_full_unstemmed An improved limit on the charge of antihydrogen from stochastic acceleration
title_sort An improved limit on the charge of antihydrogen from stochastic acceleration
author_id_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f
4a4149ebce588e432f310f4ab44dd82a
e348e4d768ee19c1d0c68ce3a66d6303
06d7ed42719ef7bb697cf780c63e26f0
785cbd474febb1bfa9c0e14abaf9c4a8
author_id_fullname_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f_***_Michael Charlton
4a4149ebce588e432f310f4ab44dd82a_***_Dirk van der Werf
e348e4d768ee19c1d0c68ce3a66d6303_***_Niels Madsen
06d7ed42719ef7bb697cf780c63e26f0_***_Aled Isaac
785cbd474febb1bfa9c0e14abaf9c4a8_***_Stefan Eriksson
author Michael Charlton
Dirk van der Werf
Niels Madsen
Aled Isaac
Stefan Eriksson
author2 M. Ahmadi
M. Baquero-Ruiz
W. Bertsche
E. Butler
A. Capra
C. Carruth
C. L. Cesar
A. E. Charman
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
A. Ishida
S. A. Jones
S. Jonsell
L. Kurchaninov
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
Michael Charlton
Dirk van der Werf
Niels Madsen
Aled Isaac
Stefan Eriksson
format Journal article
container_title Nature
container_volume 529
container_issue 7586
container_start_page 373
publishDate 2016
institution Swansea University
doi_str_mv 10.1038/nature16491
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description 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 known6 to be no greater than about 10−21e for a diverse range of species including H2, He and SF6. Charge–parity–time symmetry and quantum anomaly cancellation7 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 charge8, 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.
published_date 2016-01-20T03:31:01Z
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score 11.013731

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