Measurement of e+e- -> phi -> K+K- cross section with the CMD-2 detector at VEPP-2M Collider

2); (2) Novosibirsk State University; A.A.Grebeniuk (1; A.A.Ruban (1); A.E.Bondar (1; A.L.Sibidanov (1; A.P.Lysenko (1); A.S.Kuzmin (1; A.S.Popov (1; A.V.Bragin (1)

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arxiv 0804.0178 v1 pith:WRGYIIEE submitted 2008-04-01 hep-ex

Measurement of e+e- -> phi -> K+K- cross section with the CMD-2 detector at VEPP-2M Collider

CMD-2 Collaboration: R.R.Akhmetshin (1) , V.M.Aulchenko (1 , 2) , V.Sh.Banzarov (1) , L.M.Barkov (1) , S.E.Baru (1) , N.S.Bashtovoy (1) , A.E.Bondar (1

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D.V.Bondarev (1) A.V.Bragin (1) S.I.Eidelman (1 D.A.Epifanov (1 G.V.Fedotovich (1 N.I.Gabyshev (1) A.A.Grebeniuk (1 D.N.Grigoriev (1 F.V.Ignatov (1) S.V.Karpov (1) V.F.Kazanin (1 B.I.Khazin (1 I.A.Koop (1 P.P.Krokovny (1 A.S.Kuzmin (1 I.B.Logashenko (1) P.A.Lukin (1) A.P.Lysenko (1) K.Yu.Mikhailov (1) V.S.Okhapkin (1) E.A. Perevedentsev (1 A.S.Popov (1 S.I. Redin (1) A.A.Ruban (1) N.M.Ryskulov (1) Yu.M.Shatunov (1) B.A.Shwartz (1 A.L.Sibidanov (1 I.G.Snopkov (1) E.P.Solodov (1 Yu.V.Yudin (1) ((1) Budker Institute of Nuclear Physics Novosibirsk Russia (2) Novosibirsk State University Russia)

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The process e+ e- -> phi -> K+ K- has been studied with the CMD-2 detector using about 542 000 events detected in the center-of-mass energy range from 1.01 to 1.034 GeV. The systematic error of the cross section is estimated to be 2.2%. The phi(1020) meson parameters in the phi -> K+K- decay channel have been measured: sigma_0(phi-> K+K-) = 2016 +- 8 +- 44 nb, m(phi) = 1019.441 +- 0.008 +- 0.080 MeV/c2, Gamma(phi) = 4.24 +- 0.02 +- 0.03 MeV, B(e+e-)B(K+K-) = (14.27 +- 0.05 +- 0.31)*10(-5).

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