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MULTI - HADRON PRODUCTION IN E+ E- ANNIHILATION AT 1.45-GEV - 1.61-GEV center-of-mass ENERGY

Esposito, B. ; Marini, A. ; Pallotta, M. ; et al.

Lett.Nuovo Cim. 25 (1979) 5-12, 1979.

Inspire Record 145867 DOI 10.17182/hepdata.37370

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

NEUTRON DISSOCIATION INTO P PI- AT 19-GEV/C

Bakken, V. ; Jacobsen, T. ; Gennow, H. ; et al.

Nuovo Cim.A 49 (1979) 465-483, 1979.

Inspire Record 145707 DOI 10.17182/hepdata.37532

The reaction pn→ppπ at 19 GeV/c is studied. It is dominated by the process where the neutron dissociates into the pπ- system and exhibits the characteristic features of diffraction dissociation. The pπ- mass distribution shows a strong peak at 1.3 GeV but is otherwise rather structureless. By comparison with other experiments we find that this peak is neither seen at higher nor at lower energies. The reason why it is not seen in experiments at higher energies seems to be that they suffer from strong experimental limitations. The 1.3 GeV peak is connected with small momentum transfers and an analysis of the moments of the decay angular distributions shows that this peak is a low-spin phenomenon. For larger momentum transfers the lowest moments show an onset already at threshold. By comparison with a pion exchange Deck model we find a substantial baryon exchange contribution for small momentum transfers. This contribution seems to become more pronounced at higher energies.

1 data table

Table 1

CORRECTED FOR UNOBSERVED DECAY MODES.

EXPERIMENTAL STUDY OF THE REACTION neutrino N ---> MU- P

The GARGAMELLE NEUTRINO PROPANE collaboration Pohl, M. ; Dewit, M. ; Haidt, D. ; et al.

Lett.Nuovo Cim. 26 (1979) 332-336, 1979.

Inspire Record 144819 DOI 10.17182/hepdata.37737

None

1 data table

Table 1

Measured Quasi-Elastic total cross section.

BACKWARD PRODUCTION OF LIGHT IONS IN THE INTERACTION OF 400-GEV PROTONS WITH NUCLEI

Frankel, S. ; Frati, W. ; Gazzaly, M. ; et al.

Phys.Rev.C 20 (1979) 2257-2266, 1979.

Inspire Record 148390 DOI 10.17182/hepdata.10185

Measurements of the invariant cross sections for the reaction p(400 GeV)+(Li6, Be,C,Al,Cu,Ta)→(d, t, He3, He4)+X at laboratory angles of 70, 90, 118, 137, and 160° are reported. Comparisons are made using several scaling variables. NUCLEAR REACTIONS Inclusive cross section; 400 GeV incident protons; Li6, Be, C, Al, Cu, Ta targets; production of d, t, He3, He4; Lab angles 70°, 90°, 118°, 137°, and 160°.

77 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

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GENERAL FEATURES OF CHARGED PARTICLE PRODUCTION IN ANTI-P P INTERACTIONS AT 100-GEV/C

Ward, C.P. ; Ward, D.R. ; Ansorge, R.E. ; et al.

Nucl.Phys.B 153 (1979) 299-333, 1979.

Inspire Record 146577 DOI 10.17182/hepdata.8129

We present new data on charged particle production in p p interactions at 100 GeV/ c . Comparisons are made between p p annihilations (estimated by differences) between corresponding p p and pp data samples) and e + e − annihilation into hadrons. A technique for separating the inclusive proton and pion spectra is described and the resulting pion spectra are studied in terms of Feynman x , rapidity and p T . Comparison with pp data allows us to estimate the pion spectra in p p annihilations and we find agreement with predictions of Mueller-Regge theory. We also present results on semi-inclusive π ± and proton production, give updated topological cross sections and describe further attempts to isolate effects due to annihilations. Finally we investigate the diffractive excitation of the antiproton into low-mass states by studying events with a slow recoil proton.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the Relative Total Hadronic Cross-section R at {PETRA}

The Aachen-DESY-Annecy(LAPP)-MIT-NIKHEF-Beijing collaboration Barber, D. ; Becker, U. ; Boehm, A. ; et al.

Phys.Rev.Lett. 42 (1979) 1113, 1979.

Inspire Record 140059 DOI 10.17182/hepdata.3235

We report the first measurement of the ratio R=(σe+e−→hadrons)(σe+e−→μ+μ−) (with negligible τ-lepton contribution) at a center-of-mass energy s=13 GeV and s=17 GeV, from the just finished electron-positron colliding-beam facility PETRA. The detector, MARK-J, has an approximately 4π solid angle and measures γ, e, μ, and charged and neutral hadrons simultaneously. Our results yield R(s=17 GeV)=4.9±0.6 (statistical) ±0.7 (systematic error), and R(s=13 GeV)=4.6±0.5 (statistical) ±0.7 (systematic error). The ratio R(s=17 GeV)R(s=13 GeV) is 1.08±0.18.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

anti-LAMBDA PRODUCTION IN K- p INTERACTIONS AT 32-GeV/c

The French-Soviet & CERN-Soviet collaborations Gensch, U. ; Klein, R. ; Schreiber, H.J. ; et al.

Z.Phys.C 2 (1979) 7, 1979.

Inspire Record 142667 DOI 10.17182/hepdata.16317

Antilambda production is studied inK−p interactions at 32 GeV/c. Both total and differential cross sections are presented. The inclusive$\bar \Lambda $ production cross section amounts to 109±7 μb. A remarkable energy dependence is observed, σ($\bar \Lambda $) increasing by a factor of four between 14.3 and 32 GeV/c. Thep⊥2 distribution exhibits an exponential fall-off with a slope of 3.3±0.2 (GeV/c)−2. Most of the$\bar \Lambda $'s are emitted in the forward hemisphere. The invariantx distribution increases between 14.3 and 32 GeV/c. Data are presented for$\bar \Lambda $ production inK-p→Λ$\bar \Lambda $+XK-p→$\bar \Lambda $Kn+X, andK-p→$\bar \Lambda $p+X.

1 data table

Table 1

No description provided.

RESULTS FROM DASP ON E+ E- ANNIHILATION BETWEEN 3.1-GEV AND 5.2-GEV

The DASP collaboration Brandelik, R. ; Braunschweig, W. ; Martyn, H.U. ; et al.

Z.Phys.C 1 (1979) 233-256, 1979.

Inspire Record 145403 DOI 10.17182/hepdata.16476

This paper summarizes the measurements one+e− annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and two body decays of the narrow resonances, radiative decays of theJ/ψ and ψ′ resonances and evidence for theX(2.82), ψ′ cascade decays, inclusive η production and evidence for theF meson, semileptonic decays of charmed mesons and properties of the heavy lepton.

5 data tables

Table 1

THESE DATA ON R WERE PUBLISHED IN R. BRANDELIK ET AL., PL 76B, 361 (1978), THE RECORD OF WHICH HAS TABULATED CROSS SECTIONS WITH AND WITHOUT THE TAU HEAVY LEPTON CONTRIBUTION.

Table 2

OBSERVATION OF J/PSI RESONANCE.

Table 3

OBSERVATION OF PSI(3700)0 RESONANCE.