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phi meson production in neutron - nucleus interactions at 30-GeV - 70-GeV

The BIS-2 collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.

JINR-E1-90-316, 1990.

Inspire Record 299080 DOI 10.17182/hepdata.39413

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Inclusive cross-section of cumulative proton production in pi- (K-, anti-p) Be, Al, Cu, Pb interactions at 40-GeV/c

Antipov, Yu.M. ; Batarin, V.A. ; Bezzubov, V.A. ; et al.

IFVE-90-51, 1990.

Inspire Record 298329 DOI 10.17182/hepdata.40708

None

15 data tables

Table 1

RUN 1.

Table 2

RUN 1.

Table 3

RUN 1.

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Search for narrow baryonia

The BIS-2 collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.

575-576, 1990.

Inspire Record 299495 DOI 10.17182/hepdata.39385

None

1 data table

Table 1

No description provided.

Inclusive production of K*0(892) mesons in K+ A interactions at 11.2-GeV.

Akimenko, S.A. ; Belousov, V.I. ; Kolosov, V.N. ; et al.

Sov.J.Nucl.Phys. 52 (1990) 884-889, 1990.

Inspire Record 296925 DOI 10.17182/hepdata.40693

None

15 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Study of the Leptonic Decays of the $Z^0$ Boson

The DELPHI collaboration Aarnio, P. ; Abreu, P. ; Adam, W. ; et al.

Phys.Lett.B 241 (1990) 425-434, 1990.

Inspire Record 295500 DOI 10.17182/hepdata.15431

Measurements are presented of the cross section ratios R ℓ = σ ℓ ( e + e − →ℓ + ℓ − ) σ h ( e + e − →hadrons) for ℓ=e, μ and τ using data taken from a scan around the Z 0 . The results are R e =(5.09± o .32±0.18)%, R μ =(0.46±0.35±0.17)% and R τ =(4.72±0.38±0.29)% where, for the ratio R e , the t -channel contribution has been subtracted. These results are consistent with the hypothesis of lepton universality and test this hypothesis at the energy scale s ∼8300 GeV 2 . The absolute cross sections σ ℓ (e + e − →ℓ + ℓ − ) have also been measured. From the cross sections the leptonic partial widths Γ e =(83.2±3.0±2.4) MeV, (Γ e Γ μ ) 1 2 =(84.6±3.0±2.4) MeV and (Γ e Γ τ ) 1 2 =(82.6±3.3±3.2) MeV have been extracted. Assuming lepton universality the ratio Γ ℓ Γ h =(4.89±0.20±0.12) × 10 −2 w was obtained, together with Γ ℓ =(83.6±1.8±2.2) MeV. The number of light neutrino species is determined to be N v =3.12±0.24±0.25. Al the data are consistent with the predictions of the standard model.

4 data tables

Table 1

E+ E- final state is t-channel subtracted.

Table 2

No t-channel subtraction. Statistical errors only.

Table 3

Statistical errors only.

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THE H-3 + P ---> P + N + D REACTION AT A TRITIUM MOMENTUM OF 5-GEV/C

Abdullin, S.K. ; Blinov, A.V. ; Vanyushin, I.A. ; et al.

Nucl.Phys.A 506 (1990) 471-481, 1990.

Inspire Record 297384 DOI 10.17182/hepdata.15700

Using a liquid hydrogen bubble chamber of the ITEP, 80 cm in diameter, a study was made of the 3 H + p → p + n + d reaction with an incident momentum of 5 GeV/c for the tritium nuclei. The reaction cross section was 20.4 ± 0.2 mb. The angular, momentum and mass distributions of the reaction products in the 4π geometry have been obtained. We have separated the phase-space regions corresponding to quasi-free pn scattering and to the final-state Nd interaction. In the region of quasi-free pn scattering various experimental spectra are compared with the theoretical predictions, by using pole diagrams with nuclear vertex functions for three NN potentials: the Yamaguchi potential, the RSC potential and the potential in the quark-compound bag model. In the mass spectra of pn, pd and nd systems no evidence for the exhibition of two- and three-baryon resonances has been obtained.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The Quasielastic charge exchange reaction p He-3 ---> n(F) p p p at intermediate-energies

Blinov, A.V. ; Vanyushin, I.A. ; Grechko, V.E. ; et al.

Nucl.Phys.A 510 (1990) 803-816, 1990.

Inspire Record 302181 DOI 10.17182/hepdata.36860

The basic characteristics of the quasi-elastic charge exchange reaction p 3 He→ n F ppp are investigated using the 80 cm ITEP liquid-hydrogen bubble chamber, which is exposed to beams of 3 He nuclei with momenta of 2.5 and 5 GeV/ c (the kinetic energy of primary protons in the rest system of the nucleus are, respectively, T p = 0.318 and 0.978 GeV). The experimental data are compared with the predictions of the Glauber-Sitenko multiple scattering theory and of the pole model, taking into account the interaction between spectator nucleons in the final state. In the mass spectrum of the 3p system at 3.05 GeV a clearly denned structure has been revealed, which is not described within the pole model. A possible resonance origin of the given structure is discussed.

2 data tables

Table 1

No description provided.

Table 2

THE EVENTS WITH THE FASTEST NEUTRON: P(P=3),P(P=4),P(P=5),P(P=6).

Observation of significant spin effects in hard collisions at 40-GeV/c

Apokin, V.D. ; Arestov, Yu.I. ; Astafev, O.V. ; et al.

Phys.Lett.B 243 (1990) 461-464, 1990.

Inspire Record 303587 DOI 10.17182/hepdata.29694

A single-spin asymmetry in the inclusive π 0 production at small x F was measured. In the experiment 40 GeV/c π − mesons were incident on transversely polarized protons and deutrons. An asymmetry of (40–50)% has been revealed in the hard scattering region.

1 data table

Table 1

No description provided.