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CERN experiment weighs antimatter with unprecedented accuracy

Date:
July 28, 2011
Source:
CERN
Summary:
The Japanese-European ASACUSA experiment at CERN has reported a new measurement of the antiproton's mass accurate to about one part in a billion. Precision measurements of the antiproton mass provide an important way to investigate nature's apparent preference for matter over antimatter.

The ASACUSA experiment.
Credit: © 2011 CERN

In a paper published in the journal Nature, the Japanese-European ASACUSA experiment at CERN reported a new measurement of the antiproton's mass accurate to about one part in a billion. Precision measurements of the antiproton mass provide an important way to investigate nature's apparent preference for matter over antimatter.

"This is a very satisfying result," said Masaki Hori, a project leader in the ASACUSA collaboration. "It means that our measurement of the antiproton's mass relative to the electron is now almost as accurate as that of the proton."

Ordinary protons constitute about half of the world around us, ourselves included. With so many protons around it would be natural to assume that the proton mass should be measurable to greater accuracy than that of antiprotons. After these latest result, this remains true but only just. In future experiments, ASACUSA expects to improve the accuracy of the antiproton mass measurement to far better than that for the proton. 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.

To make these measurements antiprotons are first trapped inside helium atoms, where they can be 'tickled' with a laser beam. The laser frequency is then tuned until it causes the antiprotons to make a quantum jump within the atoms, and from this frequency the antiproton mass can be calculated. However, an important source of imprecision comes from the fact that the atoms jiggle around, so that those moving towards and away from the beam experience slightly different frequencies. A similar effect is what causes the siren of an approaching ambulance to apparently change pitch as it passes you in the street. In their previous measurement in 2006, the ASACUSA team used just one laser beam, and the achievable accuracy was dominated by this effect. This time they used two beams moving in opposite directions, with the result that the jiggle for the two beams partly cancelled out, resulting in a four times better accuracy.

"Imagine measuring the weight of the Eiffel tower" said Hori. "The accuracy we've achieved here is roughly equivalent to making that measurement to within less than the weight of a sparrow perched on top. Next time it will be a feather."


Story Source:

The above story is based on materials provided by CERN. Note: Materials may be edited for content and length.


Journal Reference:

  1. Masaki Hori, Anna Sótér, Daniel Barna, Andreas Dax, Ryugo Hayano, Susanne Friedreich, Bertalan Juhász, Thomas Pask, Eberhard Widmann, Dezső Horváth, Luca Venturelli, Nicola Zurlo. Two-photon laser spectroscopy of antiprotonic helium and the antiproton-to-electron mass ratio. Nature, 2011; 475 (7357): 484 DOI: 10.1038/nature10260

Cite This Page:

CERN. "CERN experiment weighs antimatter with unprecedented accuracy." ScienceDaily. ScienceDaily, 28 July 2011. <www.sciencedaily.com/releases/2011/07/110728082320.htm>.
CERN. (2011, July 28). CERN experiment weighs antimatter with unprecedented accuracy. ScienceDaily. Retrieved July 26, 2014 from www.sciencedaily.com/releases/2011/07/110728082320.htm
CERN. "CERN experiment weighs antimatter with unprecedented accuracy." ScienceDaily. www.sciencedaily.com/releases/2011/07/110728082320.htm (accessed July 26, 2014).

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