BaBar Steadies Omega-minus Spin

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The first evidence of the omega-minus particle in a bubble chamber. Image courtesy of Brookhaven National Laboratory
The first evidence of the omega-minus particle in a bubble chamber. Image courtesy of Brookhaven National Laboratory

If you snatch a copy of the Particle Data Book from your colleague's back pocket and flip to the entry for the Omega-minus particle, you'll see that the very first line says the spin is "not yet measured." That entry may soon be changed. The BaBar collaboration has established that the spin of the Omega-minus, a particle that was discovered more than 40 years ago, is 3/2.


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