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1.
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Fundamental Tests of Physics with Antihydrogen at ALPHA
/ Miranda, Daniel (UFRJ, Rio de Janeiro) ; Cesar, Claudio L (UFRJ, Rio de Janeiro) ; Sacramento, Rodrigo L (UFRJ, Rio de Janeiro) ; Ahmadi, Mostafa (U. Liverpool (main)) ; Nolan, Paul (U. Liverpool (main)) ; Pusa, Petteri (U. Liverpool (main)) ; Baquero-Ruiz, Marcelo (UC, Berkeley (main)) ; Carruth, Celeste (UC, Berkeley (main)) ; Charman, Andrew (UC, Berkeley (main)) ; Evans, Lenny (UC, Berkeley (main)) et al.
Magnetically trapped antihydrogen atoms at low temperatures were used to test the charge neutrality of this antiatomic system, by precisely placing a limit to its electrical charge. A new method for measuring the gravitational interaction of antimatter was also developed, and prospects for making a precise measurement of this interaction are discussed. [...]
2016
- Published in : 10.1364/LAOP.2016.LTu3B.1
In : OSA Latin America Optics and Photonics Conference, Medellin, Colombia, 22 - 26 Aug 2016, pp.LTu3B.1
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2.
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Limit on the electric charge of antihydrogen
/ Capra, A. (York U., Canada ; TRIUMF) ; Amole, C. (York U., Canada) ; Ashkezari, M.D. (Simon Fraser U.) ; Baquero-Ruiz, M. (UC, Berkeley) ; Bertsche, W. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E. (Imperial Coll., London ; CERN) ; Cesar, C.L. (Rio de Janeiro Federal U.) ; Charlton, M. (Swansea U.) ; Eriksson, S. (Swansea U.) ; Fajans, J. (UC, Berkeley ; LBL, Berkeley) et al.
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. [...]
arXiv:2107.08152.-
2016-12-20 - 7 p.
- Published in : Hyperfine Interact. 238 (2017) 9
Fulltext: PDF;
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.9
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3.
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An improved limit on the charge of antihydrogen from stochastic acceleration
/ Ahmadi, M ; Baquero-Ruiz, M ; Bertsche, W ; Butler, E (CERN) ; Capra, A ; Carruth, C ; Cesar, C L ; Charlton, M ; Charman, A E ; Eriksson, S et al.
/ALPHA
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 [...]
2016
- Published in : Nature 529 (2016) 373-376
Fulltext: PDF;
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4.
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Antiproton cloud compression in the ALPHA apparatus at CERN
/ Gutierrez, A (British Columbia U.) ; Ashkezari, M D (Simon Fraser U.) ; Baquero-Ruiz, M (UC, Berkeley) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Burrows, C (Swansea U.) ; Butler, E (Imperial Coll., London ; CERN) ; Capra, A (York U., Toronto, Dept. Phys. Astron.) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Dunlop, R (Simon Fraser U.) et al.
We have observed a new mechanism for compression of a non-neutral plasma, where antiprotons embedded in an electron plasma are compressed by a rotating wall drive at a frequency close to the sum of the axial bounce and rotation frequencies. The radius of the antiproton cloud is reduced by up to a factor of 20 and the smallest radius measured is ∼ 0.2 mm. [...]
2015 - 8 p.
- Published in : Hyperfine Interact. 235 (2015) 21-28
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5.
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6.
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Silicon vertex detector upgrade in the ALPHA experiment
/ Amole, C (York U., Canada) ; Andresen, G.B (Aarhus U.) ; Ashkezari, M.D (Simon Fraser U.) ; Baquero-Ruiz, M (UC, Berkeley) ; Bertsche, W (Manchester U ; Cockcroft Inst. Accel. Sci. Tech.) ; Burrows, C (Swansea U.) ; Butler, E (CERN) ; Capra, A (York U., Canada) ; Cesar, C.L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) et al.
The Silicon Vertex Detector (SVD) is the main diagnostic tool in the ALPHA-experiment. It provides precise spatial and timing information of antiproton (antihydrogen) annihilation events (vertices), and most importantly, the SVD is capable of directly identifying and analysing single annihilation events, thereby forming the basis of ALPHA ' s analysis. [...]
2013 - 3 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 732 (2013) 134-136
Elsevier Open Access article: PDF;
In : 13th Vienna Conference on Instrumentation, Vienna, Austria, 11 - 15 Feb 2013, pp.134-136
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7.
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8.
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An experimental limit on the charge of antihydrogen
/ ALPHA Collaboration
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). [...]
2014
- Published in : Nature Commun. 5 (2014) 3955
Macmillan Open Access article: PDF;
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9.
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Using stochastic acceleration to place experimental limits on the charge of antihydrogen
/ Baquero-Ruiz, M. (UC, Berkeley) ; Charman, A.E. (UC, Berkeley) ; Fajans, J. (UC, Berkeley ; LBNL, Berkeley) ; Little, A. (UC, Berkeley) ; Povilus, A. (UC, Berkeley) ; Robicheaux, F. (Purdue U.) ; Wurtele, J.S. (UC, Berkeley ; LBL, Berkeley) ; Zhmoginov, A.I. (UC, Berkeley)
Assuming hydrogen is charge neutral, CPT invariance demands that antihydrogen also be charge neutral. Quantum anomaly cancellation also demands that antihydrogen be charge neutral. [...]
arXiv:1405.1954.-
2014 - 13 p.
- Published in : New J. Phys. 16 (2014) 083013
Fulltext: arXiv:1405.1954 - PDF; NJP_16_8_083013 - PDF; External link: Preprint
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10.
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In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap
/ Amole, C. (York U., Canada) ; Ashkezari, M.D. (Simon Fraser U.) ; Baquero-Ruiz, M. (UC, Berkeley) ; Bertsche, W. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E. (CERN) ; Capra, A. (York U., Canada) ; Cesar, C.L. (Rio de Janeiro Federal U.) ; Charlton, M. (Swansea U.) ; Deller, A. (Swansea U.) ; Evetts, N. (British Columbia U.) et al.
We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. [...]
arXiv:1405.0692.-
2014-01-21 - 23 p.
- Published in : New J. Phys. 16 (2014) 013037
Fulltext: njp_16_1_013037 - PDF; arXiv:1405.0692 - PDF; External link: Preprint
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