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New result from LHC constrains physical effects of supersymmetry

from CERN Bulletin

Earlier this week, physicists from the LHCb collaboration presented evidence of a very rare Bs0 → μ+ μ- decay, the rate of which can be predicted very precisely in the Standard Model. Deviations from the expected values could be the signal of the existence of new particles, for example those from supersymmetry. But after analyzing data gather over the last two years they have found the decay rate to be 3.2+1.5-1.2) x 10-9, which is in very good agreement with the rate predicted via the Standard Model. This result, described in a paper posted on arXiv, does not rule out SUSY, but even at 3.5 σ it constrains what the physical effects of SUSY are on this particular decay channel. Bloggers are chattering about the result. Peter Woit puts SUSY in intensive care, whereas Gordon Kane argues that the measurements are still compatible with some types of SUSY. Meanwhile, Matt Strassler can always be relied upon to take a more measured approach. Jim Gates, one of the progenitors of SUSY, has long maintained that the actual experimental discovery of SUSY might take an incredibly long time as it could be hidden in some way by nature. more

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