HEPData Search

Charged multiplicity and π 0 cross sections for π − p inelastic interactions at 70 GeV/ c are presented. The data were obtained from an exposure of the BEBC bubble chamber equipped with a track sensitive target (TST) to an unseparated negative beam at the CERN SPS. About 10 000 events were used for the charged multiplicity study, and about 2000 Dalitz pairs for the π 0 production analysis. A total of 12 e + e − pairs with a mass higher than the π 0 mass were found and analysed in terms of η or ω Dalitz pairs or decay pairs of vector mesons. Comparisons with data at other energies are made in terms of charged prong, π 0 cross sections, and of multiplicity parameters. The moments of longitudinal and transverse momentum distributions of the π 0 are determined and compared to the predictions of quark counting rule models.

5 data tables

Table 1

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Measurement of the Reaction $e^+ e^- \to \gamma \gamma$ at {CMS} Energies From 9.4-{GeV} to 31.6-{GeV}

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.

Phys.Lett.B 94 (1980) 87-90, 1980.

Inspire Record 153120 DOI 10.17182/hepdata.27174

The differential cross section for the reaction e + e − → γγ has been measured in the CMS energy range between 9.4 and 31.6 GeV. The results are found to be in agreement with the predictions of quantum electrodynamics up to momentum transfers- q 2 of 900 GeV 2 . The data set lower limits of about 40 GeV on QED cut-off parameters. We have searched for the decay υ (9.46) → γγ and obtain an upper limit Γ ( υ → γγ )/ Γ ( υ → all) < 1.4% (95% c.l.).

1 data table

Table 1

No description provided.

Study of the Scaling in the Mean and of the Associative Multiplicity in Inclusive $K^0_S$ and $\Lambda$ Production in $\bar{P} P$ Interactions at 22.4-{GeV}/c.

The Dubna-Alma Ata-Helsinki-Moscow-Prague-Tbilisi collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Gramenitsky, I.M. ; et al.

Sov.J.Nucl.Phys. 33 (1981) 373, 1981.

Inspire Record 154157 DOI 10.17182/hepdata.39558

None

33 data tables

Table 1

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Charged Baryon and Anti-baryon Production in the Fragmentation Region by 240-{GeV} Protons

The Bristol-Geneva-Heidelberg-Orsay-Rutherford-Strasbourg collaboration Bourquin, M. ; Brown, R.M. ; Chatelus, Y. ; et al.

Z.Phys.C 5 (1980) 275, 1980.

Inspire Record 153261 DOI 10.17182/hepdata.15026

Measurements of the production inp-BeO collisions of charged baryons and antibaryons with strangeness between −3 and +3 at$\sqrt s= 21.2GeV$x=0.48, andpT=600MeV/c are reported. The experimental results can be interpreted within the framework of a simple proton fragmentation-recombination model.

5 data tables

Table 1

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$\gamma$ and $\pi^0$ Production in $\bar{p} p$ Interactions at 22.4-{GeV}/$c$

The Dubna-Alma Ata-Helsinki-Moscow-Prague-Tbilisi collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Gramenitsky, I.M. ; et al.

Sov.J.Nucl.Phys. 32 (1980) 684, 1980.

Inspire Record 154051 DOI 10.17182/hepdata.18075

None

17 data tables

Table 1

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A Determination of the Total Width of the $\Upsilon$ (9.46) Meson

Albrecht, H. ; Childers, R. ; Darden, C.W. ; et al.

Phys.Lett.B 93 (1980) 500-504, 1980.

Inspire Record 153029 DOI 10.17182/hepdata.6334

Using the DASP detector at the DESY storage ring DORIS we have continued measuring e + e − annihilations near and on the ϒ(9.46) resonance. From the cross sections for e + e − → μ + μ − and e + e − → hadrons we obtain a μ + μ − branching ratio for the ϒ(9.46) of (2.9 ± 1.3 ± 0.5) %, a leptonic width г ee = (1.35 ± 0.11 ± 0.22) keV and a total width of (47 −15 +37 keV.

2 data tables

Table 1

VISIBLE HADRONIC CROSS SECTION. PEAK VALUE AT UPSILON IS 10.1 +- 0.7 NB.

Table 2

No description provided.

Observation of a Fourth Upsilon State in e+ e- Annihilations

The CLEO collaboration Andrews, D. ; Berkelman, Karl ; Cabenda, R. ; et al.

Phys.Rev.Lett. 45 (1980) 219, 1980.

Inspire Record 153182 DOI 10.17182/hepdata.20674

A fourth state in the upsilon energy region has been seen in e+e− collisions at the Cornell Electron Storage Ring. A resonance is observed with a mass 1112±5 MeV above the lowest upsilon state. The 9.6-MeV rms width is greater than the 4.6-MeV energy resolution of the e+e− beams. The observed characteristics of the new state make it a likely candidate for the 4S3 state of the bb¯ system, lying above the threshold for the production of B mesons.

1 data table

Table 1

NOT CORRECTED FOR TAU HEAVY LEPTON PRODUCTION NOR TWO-PHOTON COLLISIONS.

Date

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Phrases

Reactions

Observables

CM Energies (GeV)

Authors Reset

$K^\pm p$ Large Angle Elastic Scattering at 20-{GeV}/$c$ and 30-{GeV}/$c$

Measurement of the Ratio of the Real Part to Imaginary Part of $p p$ and $p d$ Forward Scattering Amplitudes From 50-{GeV} to 400-{GeV}

Study of the Reaction $\bar{p} p \to p X$ at 22.4-{GeV}/$c$

Production of Charged Hadrons, $\pi^0$ and Electron Pairs in 70-{GeV}/$c \pi^- p$ Interactions

Measurement of the Reaction $e^+ e^- \to \gamma \gamma$ at {CMS} Energies From 9.4-{GeV} to 31.6-{GeV}

Study of the Scaling in the Mean and of the Associative Multiplicity in Inclusive $K^0_S$ and $\Lambda$ Production in $\bar{P} P$ Interactions at 22.4-{GeV}/c.

Charged Baryon and Anti-baryon Production in the Fragmentation Region by 240-{GeV} Protons

$\gamma$ and $\pi^0$ Production in $\bar{p} p$ Interactions at 22.4-{GeV}/$c$

A Determination of the Total Width of the $\Upsilon$ (9.46) Meson

Observation of a Fourth Upsilon State in e+ e- Annihilations