Measurements of the parameters of the $\phi(1020)$ resonance through studies of the processes $e^+ e^- \to K^+ K^-$, $K_SK_L$, and $\pi^+ \pi^- \pi^0$

Achasov, M.N.; Beloborodov, K.I.; Berdyugin, A.V.; Bogdanchikov, A.G.; Bozhenok, A.V.; Bukin, A.D.; Bukin, D.A.; Burdin, S.V.; Dimova, T.V.; Druzhinin, V.P.

doi:10.1103/PhysRevD.63.072002

Measurements of the parameters of the $\phi(1020)$ resonance through studies of the processes $e^+ e^- \to K^+ K^-$ , $K_SK_L$ , and $\pi^+ \pi^- \pi^0$

M.N. Achasov
(
- Novosibirsk, IYF
)
,
K.I. Beloborodov
(
- Novosibirsk, IYF
)
,
A.V. Berdyugin
(
- Novosibirsk, IYF
)
,
A.G. Bogdanchikov
(
- Novosibirsk, IYF
)
,
A.V. Bozhenok
(
- Novosibirsk, IYF
)

Sep, 2000

26 pages

Published in:

Phys.Rev.D 63 (2001) 072002

e-Print:

hep-ex/0009036 [hep-ex]

DOI:

10.1103/PhysRevD.63.072002

PDG:

{{\mathit \phi}{(1020)}}

\rightarrow

{{\mathit K}^{+}}{{\mathit K}^{-}}

Experiments:

NOVOSIBIRSK-SND

View in:

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Abstract: (arXiv)

The cross sections of the processes

e^+e^- \to K^+K^-

,

e^+e^- \to K_SK_L

and

e^+e^- \to \pi^+\pi^-\pi^0

were measured in the SND experiment at the VEPP-2M collider in the energy region near the

\phi(1020)

meson. These measurements were based on about

10^6

K^+K^-

,

0.5 \times 10^6

K_SK_L

and

0.4 \times 10^6

\pi^+\pi^-\pi^0

selected events. Themeasured cross sections have been analyzed in the framework of the vector meson dominance model and the main parameters of the

\phi

-resonance were obtained, such as its mass, width, the production cross section and branching ratios of the main decay modes. The measured value of the

\phi

meson total width,

\Gamma_{\phi} = 4.21 \pm 0.04

is lower than the present world average of

4.458 \pm 0.032

MeV. Contributions in addition to the conventional vector meson dominance model were found in the

e^+e^- \to \pi^+\pi^-\pi^0

reaction cross section.

Note:

26 pages REVTEX and 15 figures, accepted for publication in Physical Review D

0.984-1.060 GeV-cms
K: pair production
Novosibirsk Stor2
Phi(1020): branching ratio
Phi(1020): decay modes
Phi(1020): electroproduction
Phi(1020): hadronic decay
Phi(1020): mass
Phi(1020): width
SND

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