HEPData Search

The pion electromagnetic form factor has been measured at the VEPP-2M collider in the c.m. energy range 360 MeV–1400 MeV with the detectors OLYA and CMD. On the basis of all available data for the pion form factor collected in the timelike region, the following values for ρ-meson parameters were obtained: m ρ = 775.9 ± 1.1 MeV, σ ρ = 150.5 ± 3.0 MeV. The ω-meson branching ratio into π + π − pair, electromagnetic radius of the pion, ππ scattering length in the P-wave and the strong interaction contribution to the muon ( g − 2) value were found to be B ωππ = (2.3 ± 0.4)%, 〈 r π 2 〉 = 0.422 ± 0.013 fm 2 , a 1 1 = 0.033 ± 0.033m π −3 , a H = (68.4 ± 1.1) × 10 −9 .

2 data tables

Table 1

Experimental data from the OLYA detector

Table 2

Experimental data from the CMD detector

STUDY OF CORRELATIONS BETWEEN THE TRANSVERSE MOMENTA OF THE SECONDARY HADRONS IN anti-p p INTERACTIONS AT 32-GeV/c

Bogolyubsky, M.Yu. ; Borovikov, A.A. ; Bumazhnov, V.A. ; et al.

Sov.J.Nucl.Phys. 44 (1986) 631, 1986.

Inspire Record 223258 DOI 10.17182/hepdata.28957

None

1 data table

Table 1

No description provided.

A Measurement of Nuclear Effects in Deep Inelastic Muon Scattering on Deuterium, Nitrogen and Iron Targets

The BCDMS collaboration Bari, G. ; Benvenuti, A.C. ; Bollini, D. ; et al.

Phys.Lett.B 163 (1985) 282, 1985.

Inspire Record 216817 DOI 10.17182/hepdata.30331

New data is presented on the ratios of structure functions F 2 ( x , Q 2 ) measured in deep inelastic muon scattering with deuterium, nitrogen, and iron targets. The existence of nuclear effects at large Q 2 is confirmed with improved systematic accuracy. The ratio F 2 Fe ( x ) F 2 D 2 ( x ) covers the range 0.20 ⩽ x ⩽ 0.70 and is in agreement with earlier measurements. The ratio F 2 N 2 ( x )/ F 2 D 2 ( x ) is measured over the range 0.08 ⩽ x ⩽ 0.70 and is compatible with unity below x = 0.3.

2 data tables

Table 1

VALUES OF Q2 CORRESPONDING TO THE X-BINS IN THIS TABLE ARE:- 46-106,46-106,53-150,53-200,70-200,80-200 RESPECTIVELY.

Table 2

VALUES OF Q2 CORRESPONDING TO THE X-BINS IN THIS TABLE ARE:- 26-40,26-61,30-80,30-106,30-106,30-150,30-200,35-200,46-200.

Polarization Parameters in the Reactions $\pi^- p$ (Polarized) $\to \eta n$ and $\pi^- p$ (Polarized) $\to \eta^\prime n$ at 40-{GeV}/$c$

Apokin, V.D. ; Arestov, Yu.I. ; Avvakumov, I.A. ; et al.

Z.Phys.C 35 (1987) 173, 1987.

Inspire Record 222760 DOI 10.17182/hepdata.40802

The polarization parameter in the reactions π−p→ηn and π−p→η′n at 40 GeV/c with −t ranging from 0 to 2.6 (GeV/c)2 and 1.0 (GeV/c)2, respectively, was measured in experiments using a propanediol polarized target. Only gamma particles from the neutral meson decay were detected. The polarization parameter of the first reaction turns out to be negative in a widet interval (0.05<−t<1.6 (GeV/c)2) and probably changes its sign at larger values oft. The average value of the polarization parameter of the second reaction is equal to −17±8)% in the region 0.05<−t<0.5 (GeV/c)2.

3 data tables

Table 1

Table 2

Table 3

MEASUREMENTS OF THE POLARIZATION TRANSFER PARAMETER K(N00N) IN P P SCATTERING AT 800-MEV - 970-MEV

Borisov, N.S. ; Vovchenko, V.G. ; Efimovykh, V.A. ; et al.

JETP Lett. 43 (1986) 722-725, 1986.

Inspire Record 240172 DOI 10.17182/hepdata.16828

None

1 data table

Table 1

No description provided.

Study of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^0 \pi^0$ at (2 $e$) Up to 1.4-{GeV}

Kurdadze, L.M. ; Lelchuk, M.Yu. ; Pakhtusova, E.V. ; et al.

JETP Lett. 43 (1986) 643-645, 1986.

Inspire Record 240580 DOI 10.17182/hepdata.16834

None

1 data table

Table 1

No description provided.

One Particle Inclusive and Semiinclusive Spectra of $\Lambda$ Hyperons in $\bar{P} P$ Interactions at 32-{GeV}/c. (In Russian)

Bogolyubsky, M.Yu. ; Vinitsky, A.A. ; Ermolov, P.F. ; et al.

Yad.Fiz. 43 (1986) 1199-1210, 1986.

Inspire Record 238225 DOI 10.17182/hepdata.17515

None

1 data table

Table 1

No description provided.

INCLUSIVE PRODUCTION OF SIGMA+- (1385) HYPERONS IN ANTI-P P INTERACTIONS AT 32-GEV/C. (IN RUSSIAN)

Babintsev, V.V. ; Bogolyubsky, M.Yu. ; Boos, E.G. ; et al.

Yad.Fiz. 44 (1986) 637-643, 1986.

Inspire Record 239302 DOI 10.17182/hepdata.17484

None

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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CM Energies (GeV)

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INCLUSIVE PRODUCTION OF DELTA++ AND DELTA0 ISOBARS IN anti-p p INTERACTIONS AT 32-GeV/c

Study of the inclusive production of strange boson resonances in anti-p p interactions at 32-GeV/c.

Version 2

rivet Analysis
Electromagnetic Pion Form-Factor in the Timelike Region

STUDY OF CORRELATIONS BETWEEN THE TRANSVERSE MOMENTA OF THE SECONDARY HADRONS IN anti-p p INTERACTIONS AT 32-GeV/c

A Measurement of Nuclear Effects in Deep Inelastic Muon Scattering on Deuterium, Nitrogen and Iron Targets

Polarization Parameters in the Reactions $\pi^- p$ (Polarized) $\to \eta n$ and $\pi^- p$ (Polarized) $\to \eta^\prime n$ at 40-{GeV}/$c$

MEASUREMENTS OF THE POLARIZATION TRANSFER PARAMETER K(N00N) IN P P SCATTERING AT 800-MEV - 970-MEV

Study of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^0 \pi^0$ at (2 $e$) Up to 1.4-{GeV}

One Particle Inclusive and Semiinclusive Spectra of $\Lambda$ Hyperons in $\bar{P} P$ Interactions at 32-{GeV}/c. (In Russian)

INCLUSIVE PRODUCTION OF SIGMA+- (1385) HYPERONS IN ANTI-P P INTERACTIONS AT 32-GEV/C. (IN RUSSIAN)

Date

Collaboration

Subject_areas

Phrases

Reactions

Observables

CM Energies (GeV)

Authors Reset

Version 2 rivet Analysis Electromagnetic Pion Form-Factor in the Timelike Region

Version 2

rivet Analysis
Electromagnetic Pion Form-Factor in the Timelike Region