Abstract / Description of output
A search for the rare decay Σ+→pμ+μ- is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ+→pμ+μ- branching fraction is (2.2-1.3+1.8)×10-8, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
Original language | English |
---|---|
Article number | Aaij:2017ddf |
Pages (from-to) | 221803 |
Journal | Physical Review Letters |
Volume | 120 |
Issue number | 22 |
DOIs | |
Publication status | Published - 1 Jun 2018 |