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I recently saw this article in my Google News page, whose headline and first paragraph are:

Antimatter's Magnetic Charge Revealed

Scientists say they've made the most precise measurements to date of the magnetic charge of single particles of matter and its spooky counterpart antimatter.

From my intro-level E&M class, and the relevant Wikipedia article, I was under the impression that, by definition, a magnetic monopole would be an object with a net "magnetic charge".

If these researchers had found magnetic monopoles, I imagine there'd be a lot more coverage, so it seems like it's much more likely to be a case of shoddy science reporting. If so, what is the actual concept they are attempting to refer to?

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The article is horrible and makes no sense to me, and they don't even link to the PRL paper. I wonder if they're talking about the magnetic dipole moment. –  Siva Mar 26 '13 at 4:58
Dont take such news stories too serious, popular science journalism is way too slopy up to misleading or even wrong these days... –  Dilaton Mar 26 '13 at 6:40
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1 Answer

up vote 8 down vote accepted

The article is pretty poorly written. As Siva said it doesn't even link to the original paper. So I just looked up the name mentioned in the article and found this which is probably what they're talking about (though this is just a guess). They measured the magnetic dipole moment of protons and antiprotons to ~4 parts per million (and verified the CPT theorem at this level).

And yes, magnetic monopoles still haven't been observed.

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