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arxiv: 1612.04483 · v2 · submitted 2016-12-14 · ✦ hep-ex

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Study of the Process e^+e^-to π^+π^-π^+π^- IN THE C.M. Energy Range 920--1060 MeV with the CMD-3 Detector

R.R.Akhmetshin , A.N.Amirkhanov , A.V.Anisenkov , V.M.Aulchenko , V.Sh.Banzarov , N.S.Bashtovoy , D.E.Berkaev , A.E.Bondar
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A.V.Bragin S.I.Eidelman D.A.Epifanov L.B.Epshteyn A.L.Erofeev G.V.Fedotovich S.E.Gayazov A.A.Grebenuk S.S.Gribanov D.N.Grigoriev F.V.Ignatov V.L.Ivanov S.V.Karpov A.S.Kasaev V.F.Kazanin I.A.Koop O.A.Kovalenko A.A.Korobov A.N.Kozyrev E.A.Kozyrev P.P.Krokovny A.E.Kuzmenko A.S.Kuzmin I.B.Logashenko A.P.Lysenko P.A.Lukin K.Yu.Mikhailov V.S.Okhapkin Yu.N.Pestov E.A.Perevedentsev A.S.Popov G.P.Razuvaev Yu.A.Rogovsky A.A.Ruban N.M.Ryskulov A.E.Ryzhenenkov V.E.Shebalin D.N.Shemyakin B.A.Shwartz D.B.Shwartz A.L.Sibidanov Yu.M.Shatunov E.P.Solodov V.M.Titov A.A.Talyshev A.I.Vorobiov Yu.V.Yudin
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classification ✦ hep-ex
keywords pipiprocesscmd-3crossdetectorenergymeasuredrange
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A cross section of the process $e^+e^- \to \pipi\pipi$ has been measured using 6798$\pm$93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb$^{-1}$ collected with the CMD-3 detector in the center-of-mass energy range 920--1060 MeV. The measured cross section exhibits an interference pattern of the $\phi(1020)\to\pipi\pipi$ decay with a non-resonant process $e^+e^- \to \pipi\pipi$, from which we obtain the branching fraction of the doubly suppressed decays (by G-parity and OZI rule): $\BR(\phi\to\pipi\pipi) = (6.5\pm2.7\pm1.6)\times 10^{-6}$.

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  1. The anomalous magnetic moment of the muon in the Standard Model: an update

    hep-ph 2025-05 accept novelty 5.0

    The updated SM prediction for the muon anomalous magnetic moment is 116592033(62)×10^{-11}, showing no tension with the experimental average of 38(63)×10^{-11}.