A STUDY OF e+ e- ANNIHILATION IN THE 1400-MeV TO 2250-MeV ENERGY RANGE WITH THE MAGNETIC DETECTOR DM2 AT DCI

Augustin, J.E. ; Ayach, L. ; Calcaterra, A. ; et al.
LAL-83-21, 1983.
Inspire Record 192321 DOI 10.17182/hepdata.13242

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5 data tables

ASSUMING ABS(GE)=ABS(GM).

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Study of the $e^+ e^- \to \pi^+ \pi^- \pi^+ \pi^-$ Reaction in the 1.4-{GeV} to 2.18-{GeV} Energy Range

Cordier, A. ; Bisello, D. ; Bizot, J.C. ; et al.
Phys.Lett.B 109 (1982) 129-132, 1982.
Inspire Record 168552 DOI 10.17182/hepdata.30995

New measurements of thee + e − → π + π − π + π − cross section have been performed by the magnetic detector DM1 at DCI (ORSAY) in the 1.4−2.18 GeV total energy range with statistics of 11000 events. Assuming the4 π ± production is dominated by the ϱ′(1.6) we determine its parameters: M = 1.57 ± 0.02 (stat.) −0.00 +0.06 (syst.) GeV,Γ = 0.51 ± 0.04 (stat.) −0.01 +0.04 (syst.)GeV,Γ ρ ′ee B ϱ′→ ρ 0 π + π − = 2.67 ± 0.19 (stat.) −0.36 +0.27 (syst.)keV.

1 data table

No description provided.


Production of 4 pi+- and 6 pi+- by e+ e- Annihilation Between 2.4-GeV and 7.4-GeV

Jean-Marie, B. ; Abrams, G.S. ; Boyarski, A. ; et al.
SLAC-PUB-1711, 1976.
Inspire Record 108089 DOI 10.17182/hepdata.18658

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2 data tables

No description provided.

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Multi-Hadron Production from e+ e- Annihilation at 1.6 Center-of-Mass Energy

Esposito, B. ; Felicetti, F. ; Marini, A. ; et al.
Lett.Nuovo Cim. 19 (1977) 21-31, 1977.
Inspire Record 124164 DOI 10.17182/hepdata.37424

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3 data tables

SINGLE CHARGED PARTICLE MOMENTUM DISTRIBUTION.

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STUDY OF (PI+ PI- PI+ PI-) AND (PI+ PI- PI0) CHANNEL IN E+ E- ANNIHILATION AT 1.450-GEV - 1.875-GEV center-of-mass ENERGY

Esposito, B. ; Marini, A. ; Ronga, F. ; et al.
Lett.Nuovo Cim. 28 (1980) 195-200, 1980.
Inspire Record 158282 DOI 10.17182/hepdata.37366

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2 data tables

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POSSIBLE EVIDENCE FOR OMEGA(1670) RESONANCE.


Cross-Section Measurements for the Exclusive Reaction e+ e- --> 4 pi+- in the Energy Range 1.2-GeV to 3.0-GeV

Bernardini, M. ; Bollini, D. ; Brunini, P.L. ; et al.
Phys.Lett.B 53 (1974) 384-386, 1974.
Inspire Record 90250 DOI 10.17182/hepdata.27914

We have measured the crosss section for the reaction e + e − → 4 π ± in the energy range 1 2–3.0 GeV.No statistically significant evidence for a new vector meson in the ϱ″ region is found.

1 data table

No description provided.


A Study of the Possible Existence of rho-prime and rho-prime-prime

Alles-Borelli, V. ; Bernardini, M. ; Bollini, D. ; et al.
Nuovo Cim.A 30 (1975) 136, 1975.
Inspire Record 100204 DOI 10.17182/hepdata.37699

The possible existence of new vector mesons above the ρ is investigated. The conclusion is that our data are compatible with the existence of the ρ′-meson only if we assume as a firm theoretical prediction the Gounaris-Sakurai tail of the standard ρ-meson. Furthermore our data are compatible with the existence of the ρ″-meson if we assume the validity of the\(\bar p\)p model for the calculation of the multihadron cross-section.

3 data tables

THESE MEASUREMENTS OF THE PION FORM FACTOR ARE GIVEN IN D. BOLLINI ET AL., NCL 14, 418 (1975).

THESE MEASUREMENTS OF THE FOUR CHARGED PION CROSS SECTION ARE GIVEN IN M. BERNARDINI ET AL., PL 53B, 384 (1974).

THESE MEASUREMENTS OF THE TOTAL HADRONIC CROSS SECTION ARE GIVEN IN M. BERNARDINI ET AL., PL 51B, 200 (1974).


Cross-section of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^+ \pi^-$ for Center-of-mass Energies From 890-{MeV} to 1100-{MeV}

Cordier, A. ; Delcourt, B. ; Eschstruth, P. ; et al.
Phys.Lett.B 81 (1979) 389-392, 1979.
Inspire Record 132828 DOI 10.17182/hepdata.27360

We present the results of a measurement of the cross section oof the reaction e + e − → π + π − π + π − from 890 to 1100 MeV in the center of mass, obtained with a magnetic detector at the Orsay Storage Ring ACO. With respect to previous experiments, the present one offers the possibility of reconstructing events with at least one constraint and his improved statistics. We find that our measurement of the cross section for e + e − → π + π − π + π − is compatible with quasi two-body production of π A 1 ( m A1 = 1.1 GeV, Γ A1 ∼ 0.2−0.3 GeV), through the ϱ and ϱ′(1600) intermediate states. We were able to states. We were able to determine the cross section of this reaction at the energy of the φ meson and consequently an upper limit on the branching ratio of φ → π + π − π + π − .

1 data table

UPPER LIMIT FOR PHI --> 4PI.


Multi-Pion Production Below 1.1-GeV by e+ e- Annihilation

Cosme, G. ; Courau, A. ; Dudelzak, B. ; et al.
Phys.Lett.B 63 (1976) 349-351, 1976.
Inspire Record 115717 DOI 10.17182/hepdata.27637

The production of multipion events by e + e − annihilation has been measured at centre of mass energies 915,990 and 1076 MeV. Both channels e + e − → π + π − π o and e + e − → π + π − π + π − have been analysed. An energy threshold effect analysed. An energy threshold effect around 919 MeV ( m ω + m π o ) has been evidenced for the π + π − π o π o channel and the cross section is consistent with the quasi two-body process e + e − → ωπ o . The cross section for π + π − π + π − is lower by an order of magnitude and increases with the energy.

2 data tables

SYSTEMATIC ERROR INCLUDED. RADIATIVE EFFECT (<15 PCT) INCLUDED.

MULTIHADRON PRODUCTION CROSS SECTION DEDUCED AS SUM OF FOUR PION CHANNELS.