Evidence for the Rare Decay Σ⁺→pμ⁺μ⁻
Name
PhysRevLett.120.221803.pdf
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346.39 KB
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Checksum (MD5)
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
May 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. "Evidence for the Rare Decay Σ⁺→pμ⁺μ⁻." Physical Review Letters 120, 22 (June 2018): 221803 © 2018 CERN for the LHCb Collaboration
Version
Final published version
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[subscript -1.3][superscript +1.8])×10⁻⁸, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.120.221803
