Hints of New Physics in the Decay Sigma-plus -> proton + mu-plus + mu-minus

Details Hints of New Physics in the Decay Sigma-plus -> proton + mu-plus + mu-minus Hints of New Physics in the Decay Sigma-plus -> proton + mu-plus + mu-minus

2006-06-16

arxiv.org/abs/hep-ex/0606038v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures, submitted to the proceedings of the Moriond 2006 Electroweak session

Scientific paper

The HyperCP (E871) experiment collected several billion hyperon decays in the 1997 and 1999 Fermilab fixed-target running periods. Using the data from the 1999 run, we report on the observation of three isolated events with reconstructed masses consistent with the hypothesis Sigma-plus -> proton + mu-plus + mu-minus. This is the rarest baryon decay ever observed. The dimuon mass distribution is unexpectedly narrow, suggesting the decay may proceed via an intermediate state of mass 214.3 +/- 0.5 MeV/c^2. This state is consistent with a short-lived pseudoscalar sgoldstino with parity-conserving interactions decaying into two unlike-sign muons.

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