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CERN measures antiproton mass very accurately
William Atkins
Friday, 29 July 2011 21:53
Scientists from Japan and Europe have used a CERN experiment to measure the mass of the antiproton to an accuracy of about one part in a billion. Such an experiment helps scientists to research the relationship of matter and antimatter in the universe.
Dr. Masaki Hori, the project leader in the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) experiment at CERN stated, 'This is a very satisfying result. It means that our measurement of the antiproton's mass relative to the electron is now almost as accurate as that of the proton.' [CERN (7-28-2011): 'CERN experiment weighs antimatter with unprecedented accuracy']
The CERN press release exclaims, 'Any difference between the mass of protons and antiprotons would be a signal for new physics, indicating that the laws of nature could be different for matter and antimatter.'
The paper by these Japanese-European researchers is entitled 'Two-photon laser spectroscopy of antiprotonic helium and the antiproton-to-electron mass ratio' (DOI: 10.1038/nature10260).
It was published on July 28, 2011, in the journal Nature.
The paper is authored by Masaki Hori, Anna Soter, Daniel Barna, Andreas Dax, Ryugo Hayano, Susanne Friedreich, Bertalan Juhasz, Thomas Pask, Eberhard Widmann, Dezso Horvath, Luca Venturelli, and Nicola Zurlo.
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