CERN Accelerating science

Article
Report number	arXiv:1710.03288
Title	The ASACUSA antihydrogen and hydrogen program : results and prospects
Author(s)	Malbrunot, C. (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Arguedas Cuendi, S. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Nishina Ctr., RIKEN) ; Dupre, P. (Nishina Ctr., RIKEN) ; Fleck, M. (Stefan Meyer Inst. Subatomare Phys.) ; Higaki, H. (ADSM, Hiroshima) ; Kanai, Y. (Nishina Ctr., RIKEN) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Kuroda, N. (Tokyo U., Komaba) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Mäckel, V. (Stefan Meyer Inst. Subatomare Phys.) ; Mascagna, V. (Brescia U. ; INFN, Pisa) ; Massiczek, O. (Stefan Meyer Inst. Subatomare Phys.) ; Matsuda, Y. (Tokyo U., Komaba) ; Nagata, Y. (Tokyo U. of Sci.) ; Simon, M.C. (Stefan Meyer Inst. Subatomare Phys.) ; Spitzer, H. (Stefan Meyer Inst. Subatomare Phys.) ; Tajima, M. (Tokyo U., Komaba) ; Ulmer, S. (Nishina Ctr., RIKEN) ; Venturelli, L. (Brescia U. ; INFN, Pavia) ; Widmann, E. (Stefan Meyer Inst. Subatomare Phys.) ; Wiesinger, M. (Stefan Meyer Inst. Subatomare Phys.) ; Yamazaki, Y. (Nishina Ctr., RIKEN) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.)
Publication	2018-03-28
Imprint	2017-10-09
Number of pages	16
Note	16 pages
In:	Philos. Trans. R. Soc. Lond. 376 (2018) 20170273
In:	Antiproton Physics in the ELENA Era : Theo Murphy meeting, Newport Pagnell, Buckinghamshire, UK, 4 - 5 Sep 2017, pp.20170273
DOI	10.1098/rsta.2017.0273
Subject category	physics.atom-ph ; Other Fields of Physics
Accelerator/Facility, Experiment	CERN ASACUSA
Abstract	The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 meters away from their production region. This was the first observation of "cold" antihydrogen atoms in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7x 10^(-9) which constitues the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in ground-state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed.
Copyright/License	preprint: (License: arXiv-1.0)

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