An international collaboration of particle physicists has made new measurements that shed more light on the weak force, which is responsible for radioactive beta-decay. The results, which agree with the Standard Model, show that the strength of the weak force acting on two electrons lessens when the electrons are far apart (hep-ex/0504049). "Physicists have long expected that the weak-force interactions would be weaker at longer distances, but proving it wasn't easy," says experiment co-spokesman Krishna Kumar, who is at the University of Massachusetts-Amherst.
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