@article{7a7097daca04400daa711676b4bb131b,
title = "Evidence for the Rare Decay Σ+ →pμ+μ-",
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.",
author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. D'Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and M. Atzeni and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and {Carvalho Akiba}, K. and V. Coco and {De Bruyn}, K. and M. Ferro-Luzzi and T. Ketel and T. Li and M. Merk and Onderwater, {C. J.G.} and G. Raven and M. Schiller and N. Serra and B. Storaci and V. Syropoulos and {Van Tilburg}, J. and S. Tolk and P. Tsopelas and N. Tuning and {LHCb Collaboration}",
year = "2018",
month = jun,
day = "1",
doi = "10.1103/PhysRevLett.120.221803",
language = "English",
volume = "120",
pages = "1--10",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",
}
