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G. Alkhazov; L. An; V. Balagura; C. Barschel; V. Batozskaya; F. Bedeschi; V. Bocci; T. Boettcher; M. Borisyak; F. Bossu; M. Calvi; A. Camboni; L. Capriotti; G. Carboni; R. Cenci; S. F. Cheung; A. Chubykin; A. Cook; C. M. Costa Sobral; M. Cruz Torres; P. De Simone; H.-P. Dembinski; P. Di Nezza; G. Dujany; M. Dziewiecki; T. Evans; R. Fay; R. A. Fini; M. Fiore; D. C. Forshaw; M. Gandelman; P. J. Garsed; L. Gavardi; A. Gomes; G. Graziani; R. Greim; L. Grillo; X. Han; S. T. Harnew; D. Hill; R. Jacobsson; S. Klaver; T. Klimkovich; S. Koliiev; S. Kotriakhova; F. Kruse; V. Kudryavtsev; A. K. Kuonen; M. Lucio Martinez; E. Luppi; M. Martin; M. Martinelli; D. Martinez Santos; E. Maurice; F. Meier; A. Merli; D. A. Milanes; J. Müller; T. Nakada; D. P. O’Hanlon; A. Ossowska; M. Patel; C. Patrignani; G. Penso; S. Perazzini; B. Pietrzyk; A. Piucci; T. Poikela; S. Poslavskii; R. Quagliani; V. Renaudin; K. Rinnert; E. Rodrigues; S. Roiser; N. Sagidova; C. Sanchez Mayordomo; B. Schmidt; M. Shapkin; I. Shapoval; R. Silva Coutinho; G. Simi; S. Simone; N. Skidmore; T. Skwarnicki; l. Soares Lavra; F. Stagni; U. Straumann; T. Szumlak; M. T. Tran; A. Trisovic; V. Vagnoni; S. Valat; J. V. Viana Barbosa; S. A. Wotton; Y. Xie; Z. Yang; O. Yushchenko; L. Zhang; Y. Zhang; S. Zucchelli
The European physical journal. C, Particles and fields, 10/2017, Letnik: 77, Številka: 10Journal Article
Abstract A search for the decay $${{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-$$ KS0→μ+μ- is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of $$3\,\text{ fb }^{-1} $$ 3fb-1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8$$\mathrm {\,TeV}$$ TeV . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of $$\mathcal{B}({{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-) < 0.8~(1.0) \times 10^{-9}$$ B(KS0→μ+μ-)<0.8(1.0)×10-9 at $$90\%~(95\%)$$ 90%(95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.
