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Author (up) LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Martinez-Vidal, F.; Lucio Martinez, M.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Zhuo, J. url  doi
openurl 
  Title Observation of the Very Rare Σ+ → pμ+μ- Decay Type Journal Article
  Year 2025 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.  
  Volume 135 Issue 5 Pages 051801 - 14pp  
  Keywords  
  Abstract The first observation of the Sigma(+) -> p mu(+)mu(-) decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb(-1), collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237 +/- 16 Sigma(+) -> p mu(+)mu(-) decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08 +/- 0.17) x 10(-8) is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.  
  Address [Bonacci, R. B.; Dekkers, S.; Egede, U.; Fujii, Y.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Australia  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0031-9007 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001545456300001 Approved no  
  Is ISI yes International Collaboration yes  
  Call Number IFIC @ pastor @ Serial 6931  
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