Evidence for the Rare Decay Σ+ →pμ+μ-

LHCb Collaboration

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Article number221803
JournalPhysical Review Letters
Volume120
Issue number22
DOIs
Publication statusPublished - 31 May 2018

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mass distribution
center of mass
standard deviation
luminosity
collisions
decay
predictions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Evidence for the Rare Decay Σ+ →pμ+μ-. / LHCb Collaboration.

In: Physical Review Letters, Vol. 120, No. 22, 221803, 31.05.2018.

Research output: Contribution to journalArticle

LHCb Collaboration. / Evidence for the Rare Decay Σ+ →pμ+μ-. In: Physical Review Letters. 2018 ; Vol. 120, No. 22.
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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.",
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AU - Adeva, B.

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AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

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AU - Alvarez Cartelle, P.

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AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - D'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baker, S.

AU - Balagura, V.

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AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Batozskaya, V.

AU - Mazurov, A.

AU - Petrov, A.

AU - Strokov, S.

AU - Vagner, A.

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