Hyperfine Interactions

, 238:9 | Cite as

Limit on the electric charge of antihydrogen

  • A. Capra
  • C. Amole
  • M. D. Ashkezari
  • M. Baquero-Ruiz
  • W. Bertsche
  • E. Butler
  • 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
  • J. T. K. McKenna
  • S. Menary
  • S. C. Napoli
  • P. Nolan
  • K. Olchanski
  • A. Olin
  • A. Povilus
  • P. Pusa
  • 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
Article
Part of the following topical collections:
  1. Proceedings of the 6th International Symposium on Symmetries in Subatomic Physics (SSP 2015), Victoria, Canada, 8-12 June 2015

Abstract

The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, H̅. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of H̅ provides a test of CPT invariance. The experimental technique is based on the measurement of the deflection of putatively charged H̅ in an electric field. The tendency for trapped H̅ atoms to be displaced by electrostatic fields is measured and compared to the results of a detailed simulation of H̅ dynamics in the trap. An extensive survey of the systematic errors was performed, and this work focuses on those due to the silicon vertex detector, which is the device used to determine the H̅ annihilation position. The limit obtained on the charge of the H̅ atom is Q = (−1.3 ± 1.8 ± 0.4) × 10−8, representing the first precision measurement with H̅ [1].

Keywords

Antihydrogen Atom trapping CPT Fundamental symmetries Silicon detector Position sensitive detector Electric charge Electric neutrality Quantum anomaly 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • A. Capra
    • 1
    • 20
  • C. Amole
    • 1
  • M. D. Ashkezari
    • 2
  • M. Baquero-Ruiz
    • 3
  • W. Bertsche
    • 4
    • 5
  • E. Butler
    • 6
    • 7
  • C. L. Cesar
    • 8
  • M. Charlton
    • 9
  • S. Eriksson
    • 9
  • J. Fajans
    • 3
    • 10
  • T. Friesen
    • 11
  • M. C. Fujiwara
    • 20
  • D. R. Gill
    • 20
  • A. Gutierrez
    • 12
  • J. S. Hangst
    • 7
    • 13
  • W. N. Hardy
    • 12
    • 14
  • M. E. Hayden
    • 2
  • C. A. Isaac
    • 9
  • S. Jonsell
    • 15
  • L. Kurchaninov
    • 20
  • A. Little
    • 3
  • J. T. K. McKenna
    • 16
  • S. Menary
    • 1
  • S. C. Napoli
    • 9
  • P. Nolan
    • 16
  • K. Olchanski
    • 20
  • A. Olin
    • 20
  • A. Povilus
    • 3
  • P. Pusa
    • 16
  • F. Robicheaux
    • 17
  • E. Sarid
    • 18
  • D. M. Silveira
    • 8
  • C. So
    • 3
  • T. D. Tharp
    • 19
  • R. I. Thompson
    • 11
  • D. P. van der Werf
    • 9
  • Z. Vendeiro
    • 3
  • J. S. Wurtele
    • 3
    • 10
  • A. I. Zhmoginov
    • 3
    • 10
  • A. E. Charman
    • 3
  1. 1.Department of Physics and AstronomyYork UniversityTorontoCanada
  2. 2.Department of PhysicsSimon Fraser UniversityBurnabyCanada
  3. 3.Department of PhysicsUniversity of California at BerkeleyBerkeleyUSA
  4. 4.School of Physics and AstronomyUniversity of ManchesterManchesterUK
  5. 5.The Cockcroft InstituteDaresbury LaboratoryWarringtonUK
  6. 6.Centre for Cold MatterImperial CollegeLondonUK
  7. 7.Physics DepartmentCERNGeneva 23Switzerland
  8. 8.Instituto de FísicaUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil
  9. 9.Department of Physics, College of ScienceSwansea UniversitySwanseaUK
  10. 10.Lawrence Berkeley National LaboratoryBerkeleyUSA
  11. 11.Department of Physics and AstronomyUniversity of CalgaryCalgaryCanada
  12. 12.Department of Physics and AstronomyUniversity of British ColumbiaVancouverCanada
  13. 13.Department of Physics and AstronomyAarhus UniversityAarhus CDenmark
  14. 14.Canadian Institute of Advanced ResearchTorontoCanada
  15. 15.Department of PhysicsStockholm UniversityStockholmSweden
  16. 16.Department of PhysicsUniversity of LiverpoolLiverpoolUK
  17. 17.Department of PhysicsPurdue UniversityWest LafayetteUSA
  18. 18.Department of PhysicsNRCN-Nuclear Research Center NegevBeer ShevaIsrael
  19. 19.Department of PhysicsMarquette UniversityMilwaukeeUSA
  20. 20.TRIUMFVancouverCanada

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