Date

Collaboration

Subject_areas

Observation of a broad peak in the production of four charged pions by e+ e- collisions around 1.6 gev

Barbarino, G. ; Grilli, M. ; Iarocci, E. ; et al.
Lett.Nuovo Cim. 3 (1972) 689-692, 1972.
Inspire Record 77547 DOI 10.17182/hepdata.37365
1 data table

STATISTICAL ERRORS ONLY.


a(1)(1260) pi dominance in the process e+ e- ---> 4 pi at energies 1.05-GeV - 1.38-GeV

The CMD-2 collaboration Akhmetshin, R.R. ; Anashkin, E.V. ; Arpagaus, M. ; et al.
Phys.Lett. B466 (1999) 392-402, 1999.
Inspire Record 483994 DOI 10.17182/hepdata.50145

First results of the study of the process e+e- \to 4\pi by the CMD-2 collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV. Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the processes e+e- \to \pi^+\pi^- 2\pi^0 and e+e- \to 2\pi^+ 2\pi^- has been measured. Analysis of the differential distributions demonstrates the dominance of the a_1\pi and \omega\pi intermediate states. Upper limits for the contributions of other alternative mechanisms are also placed.

3 data tables

Energy dependence of the cross section for the 2PI+ 2PI- final state. Statistical errors only.

Energy dependence of the cross section for the PI+ PI- 2PI0 final state. Statistical errors only.

Energy dependence of the cross section for the OMEGA PI0 final state. Statistical errors only.


Observation of the phi ---> pi+ pi- pi+ pi- decay

The CMD-2 collaboration Akhmetshin, R.R. ; Anashkin, E.V. ; Arpagaus, M. ; et al.
Phys.Lett. B491 (2000) 81-89, 2000.
Inspire Record 531667 DOI 10.17182/hepdata.41735

Using 11.6 pb^{-1} of data collected in the energy range 0.984--1.06 GeV by CMD-2 at VEPP-2M, the cross section of the reaction e+e- to pi+pi-pi+pi- has been studied. For the first time an interference pattern was observed in the energy dependence of the cross section near the phi meson. The branching ratio of the phi to pi+pi-pi+pi- decay double suppressed by the G-parity and OZI rule is measured Br(phi to pi+pi-pi+pi-) = (3.93 +- 1.74 +- 2.14) \cdot 10^{-6}. The upper limits have been placed for the decays phi to pi+pi-pi+pi-pi0 and phi to eta pi+pi- Br(phi to pi+pi-pi+pi-pi0) < 4.6 \cdot 10^{-6} 90% CL, Br(phi to eta pi+pi-) < 1.8 \cdot 10^{-5} 90% CL.

1 data table

Only statistical errors are presented. The total systematic error is estimated to about 13 PCT.


Experiments at VEPP-2M with SND detector

The SND collaboration Achasov, M.N. ; Aulchenko, V.M. ; Baru, S.E. ; et al.
No Journal Information, 1998.
Inspire Record 476386 DOI 10.17182/hepdata.50374

Short overview of experiments with SND detector at VEPP-2M e^+e^- collider in the energy range 2E = 400 - 1400 MeV and preliminary results of data analysis are presented.

4 data tables

No description provided.

No description provided.

No description provided.

More…

THE RESULTS OF EXPERIMENTS WITH CMD ON VEPP-2M STORAGE RING

Anikin, G.V. ; Barkov, L.M. ; Khazin, B.I. ; et al.
Conference Paper, 1983.
Inspire Record 192095 DOI 10.17182/hepdata.37149
5 data tables

No description provided.

No description provided.

No description provided.

More…

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.
Conference Paper, 1983.
Inspire Record 192321 DOI 10.17182/hepdata.13242
5 data tables

ASSUMING ABS(GE)=ABS(GM).

No description provided.

No description provided.

More…

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. B109 (1982) 129-132, 1982.
Inspire Record 168552 DOI 10.17182/hepdata.30995
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.
No Journal Information, 1976.
Inspire Record 108089 DOI 10.17182/hepdata.18658
2 data tables

No description provided.

No description provided.


Measurement of the $e^+ e^- \to \pi^+ \pi^- \pi^+ \pi^-$ Cross-section in the $\rho^\prime$ (1600) Energy Region

Bacci, C. ; Baldini-Celio, R. ; Battistoni, G. ; et al.
Phys.Lett. B95 (1980) 139-142, 1980.
Inspire Record 153382 DOI 10.17182/hepdata.27154
1 data table

No description provided.


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
3 data tables

SINGLE CHARGED PARTICLE MOMENTUM DISTRIBUTION.

No description provided.

No description provided.


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
2 data tables

No description provided.

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. B53 (1974) 384-386, 1974.
Inspire Record 90250 DOI 10.17182/hepdata.27914
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. A30 (1975) 136, 1975.
Inspire Record 100204 DOI 10.17182/hepdata.37699
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. B81 (1979) 389-392, 1979.
Inspire Record 132828 DOI 10.17182/hepdata.27360
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. B63 (1976) 349-351, 1976.
Inspire Record 115717 DOI 10.17182/hepdata.27637
2 data tables

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

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


Hadronic production by e+ e- collisions at the energy 990 mev with the orsay storage ring

Cosme, G. ; Jean-Marie, B. ; Jullian, S. ; et al.
Phys.Lett. B40 (1972) 685-688, 1972.
Inspire Record 75666 DOI 10.17182/hepdata.28276
1 data table

RATIO TO MUON PAIR PRODUCTION CALCULATED FROM CROSS SECTION. INCLUDING SYSTEMATIC ERRORS.


Multihadron production in e+ e- collisions at high energy

Grilli, M. ; Iarocci, E. ; Spillantini, P. ; et al.
Nuovo Cim. A13 (1973) 593-644, 1973.
Inspire Record 87243 DOI 10.17182/hepdata.1179
3 data tables

No description provided.

VALUES OF R CALCULATED FROM TOTAL CROSS SECTION.

No description provided.


The first results of an experiment to study multiple production of pions on colliding electron-positron beams at a cryogenic magnetic detector

Barkov, L.M. ; Blinov, G.A. ; Vasserman, I.B. ; et al.
No Journal Information, 1982.
Inspire Record 1501545 DOI 10.17182/hepdata.76280
5 data tables

No description provided.

No description provided.

No description provided.

More…