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

arXiv:0804.0178·hep-ex·August 27, 2012

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, 2), D.V.Bondarev (1), A.V.Bragin (1), S.I.Eidelman (1 and, 2), D.A.Epifanov (1, 2), G.V.Fedotovich (1, 2), N.I.Gabyshev (1),

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TL;DR

This study precisely measures the e+e- -> phi -> K+K- cross section and phi meson parameters using the CMD-2 detector, providing detailed data within a specific energy range.

Contribution

It presents new high-precision measurements of the phi meson parameters and cross section in e+e- collisions, improving accuracy over previous results.

Findings

01

Measured phi meson mass as 1019.441 MeV/c2

02

Determined the phi decay width as 4.24 MeV

03

Calculated the branching ratio B(e+e-)B(K+K-) as 14.27e-5

Abstract

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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