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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 669, p. 217-222

Measurement of e+ e- → φ{symbol} → K+ K- cross section with CMD-2 detector at VEPP-2M collider

Akhmetshin R. R., Aulchenko V. M., Banzarov V. Sh, Barkov L. M., Baru S. E., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Eidelman S. I., Epifanov D. A., Fedotovich G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ignatov F. V., Karpov S. V., Kazanin V. F., Khazin B. I., Koop I. A., Krokovny P. P., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Mikhailov K. Yu, Okhapkin V. S., Perevedentsev E. A., Popov A. S., Redin S. I., Ruban A. A., Ryskulov N. M., Shatunov Yu M., Shwartz B. A., Sibidanov A. L., Snopkov I. G., Solodov E. P., Yudin Yu V.

The process e+ e- → φ{symbol} → 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 φ{symbol} (1020) meson parameters in the φ{symbol} → K+ K- decay channel have been measured: σ0 (φ{symbol} → K+ K-) = 2016 ± 8 ± 44   nb, mφ{symbol} = 1019.441 ± 0.008 ± 0.080   MeV / c2, Γφ{symbol} = 4.24 ± 0.02 ± 0.03   MeV, Be+ e- BK+ K- = (14.27 ± 0.05 ± 0.31) × 10-5. © 2008 Elsevier B.V.