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Observation of the very rare Σ+ →𝑝⁢𝜇+⁢𝜇− decay

The first observation of the Σ+ →𝑝⁢𝜇+⁢𝜇− 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 Σ+→𝑝⁢𝜇+⁢𝜇− decays is obtained, where t...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Dittmann, Lucas (Author) , Glaser, Fabian (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 29 July, 2025
In: Physical review letters
Year: 2025, Volume: 135, Issue: 5, Pages: 1-14
ISSN:1079-7114
DOI:10.1103/r3v2-kmmp
Online Access:Resolving-System, kostenfrei, Volltext: https://doi.org/10.1103/r3v2-kmmp
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/r3v2-kmmp
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Author Notes:LHCb Collaboration
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Summary:The first observation of the Σ+ →𝑝⁢𝜇+⁢𝜇− 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 Σ+→𝑝⁢𝜇+⁢𝜇− decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08±0.17)×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.
Item Description:LHCb Collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, M. De Cian, L. Dittmann, F. Glaser, X. Han, S. Hansmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M.D. Tat, G. Tuci, L.H. Ueckert, D.J. Unverzagt, U. Uwer, C. Wang, Y. Zhao, A. Zhelezov [und 1126 weitere]
Gesehen am 31.03.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/r3v2-kmmp

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