Eschstruth, P.
E+ E- --> PI+ PI0 PI-
[1.02]
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Results of the experiments from the neutral detector at the VEPP-2M storage ring in the energy region 2E$_{0}$ = 1.05 - 1.40 GeV

Dolinski, S.I. ; Druzhinin, V P ; Dubrovin, M S ; et al.
IYAF-85-98, 1985.
Inspire Record 1393709 DOI 10.17182/hepdata.982

None

4 data tables
Table 1

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Table 2

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Table 3

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Study of the phi meson by e+ e- annihilation into charged k mesons and tests of vector dominance models

Bizot, J.C. ; Buon, J. ; Chatelus, Y. ; et al.
Phys.Lett.B 32 (1970) 416-420, 1970.
Inspire Record 63115 DOI 10.17182/hepdata.28809

We have measured the e + e − → ø reaction by its K + K − decay mode. Using our previous results on K O K O and the 3π decay mode of the ø mesons, we compute Γ ø → e + e − and then compare the whole Orsay results to theoretical predictions.

2 data tables
Table 1

FITTED CROSS SECTIONS AT PHI PEAK. ONLY PHI --> K+ K- MEASURED HERE - ANALYSIS USES PREVIOUS EXPERIMENTS FOR OTHER CHANNELS: J.E. AUGUSTIN ET AL., PL 28B, 517 (1969).

Table 2

EXCITATION OF K+ K- CHANNEL MEASURED AROUND PHI RESONANCE AT 13 ENERGIES.


Evidence for an Interference Effect Between omega and phi Resonances in pi+ pi- pi0 Production with the Orsay Colliding-Beam Ring

Parrour, G. ; Cosme, G. ; Courau, A. ; et al.
Phys.Lett.B 63 (1976) 357-361, 1976.
Inspire Record 99834 DOI 10.17182/hepdata.27628

The cross section e + e − → π + π − π o has been measured in the φ energy region and at three other energies (915, 990, 1076 MeV) chosen outside the ω and φ resonances. In the same experiment the energy position and the width of the φ resonance have been determined from the φ →K S o K L o channel. It is found that the magnitude and energy dependence of the experimental cross section are well described by coherent production of ω and φ in the whole energy range 770 to 1076 MeV. Our data clearly show an interference effect which corresponds to an opposite sign between the two products g γω g ω →3 π and g γφ g φ →3 π of the coupling constants.

1 data table
Table 1

EXPERIMENTAL CROSS SECTIONS - RADIATIVE CORRECTIONS CAN BE SIGNIFICANT.


rivet Analysis
Cross-section of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^0$ for Center-of-mass Energies From 750-{MeV} to 1100-{MeV}

Cordier, A. ; Delcourt, B. ; Eschstruth, P. ; et al.
Nucl.Phys.B 172 (1980) 13-24, 1980.
Inspire Record 140174 DOI 10.17182/hepdata.34511

We present the results obtained with the magnetic detector DM1 at the Orsay storage ring ACO for the reaction e + e − → π + π − π 0 from 483 to 1100 MeV in the center of mass. Our data show without ambiguity an interference effect between the ω and φ mesons, which corresponds to a negative coupling constant product ratio Re( g γω g ω →3 π / g γφ g φ →3 π ) ; however our measurements above the φ, performed using kinematical analysis, can only be explained by a higher energy contribution. In addition, the parameters of the ω have been obtained with an improved accuracy compared to other experiments, and particularly the branching ratio B ω →e + e − = (6.75±0.69) × 10 −5 . We confirm that the reaction e + e − → π + π − π 0 proceeds essentially via a quasi-two-body state ϱπ , at the energy of the φ.

1 data table
Table 1

FITTED CROSS SECTION AT OMEGA PEAK IS 1410 +- 130 NB AND AT PHI PEAK IS 615 +- 55 NB.