# Evidence for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$

Abstract : 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.
Keywords :
Document type :
Journal articles

https://hal.archives-ouvertes.fr/hal-01807288
Contributor : Inspire Hep <>
Submitted on : Monday, June 4, 2018 - 3:40:02 PM
Last modification on : Wednesday, June 12, 2019 - 5:36:48 AM

### Citation

Roel Aaij, Bernardo Adeva, Marco Adinolfi, Ziad Ajaltouni, Simon Akar, et al.. Evidence for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$. Phys.Rev.Lett., 2018, 120 (22), pp.221803. ⟨10.1103/PhysRevLett.120.221803⟩. ⟨hal-01807288⟩

Record views