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A Search for the Top and $b^\prime$ Quarks in Hadronic $\Z^0$ Decays

The OPAL collaboration Akrawy, M.Z. ; Alexander, G. ; Allison, J. ; et al.

Phys.Lett.B 236 (1990) 364-374, 1990.

Inspire Record 283784 DOI 10.17182/hepdata.29702

We report on a search for new quarks in hadronic Z° decays. From the event shape analysis of a data sample containing 2185 multihadronic annihilation events, we observe no evidence for the top or b' quarks. We derive limits for the top and b' quark masses under the assumption of various possible standard model and non-standard model decay schemes. Our search is sensitive to quark masses larger than 23 GeV/ c 2 ; it yields the following lower limits at a 95% confidence level: 44.5 GeV/ c 2 for the top quark mass and 45.2 GeV/ c 2 for the b′ quark mass.

1 data table

Table 1

Measured event shape distributions - uncorrected.

Measurement of the Z0 Mass and Width with the OPAL Detector at LEP

The OPAL collaboration Akrawy, M.Z. ; Alexander, G. ; Allison, J. ; et al.

Phys.Lett.B 231 (1989) 530-538, 1989.

Inspire Record 282821 DOI 10.17182/hepdata.29757

We report an experimental determination of the cross section for e + e − → hadrons from a scan around the Z 0 pole. On the basis of 4350 hadronic events collected over seven energy points between 89.26 GeV and 93.26 GeV we obtain a mass of m z =91.01±0.05±0.05 GeV, and a total decay width of Γ z =2.60±0.13 GeV. In the context of the standard model t these results imply 3.1 ± 0.4 neutrino generations.

1 data table

Table 1

No description provided.

CENTRAL INTERACTIONS OF Ne-22 NUCLEI WITH HEAVY PHOTOEMULSION NUCLEI AT P(0) = 4.1/A-GeV/c

The Alma Ata-Bucharest-Gatchina:Dubna-Dushanbe-Yerevan-Zernograd- Kosice-Cracow-Leningrad-Moscow-Tashkent-Tbilisi-Ulan Bator collaboration Andreeva, N.P. ; Anzon, Z.V. ; Ameeva, B.U. ; et al.

JINR-P1-89-213, 1989.

Inspire Record 281512 DOI 10.17182/hepdata.38837

None

5 data tables

Table 1

NUCLEUS IS NUCLEAR PHOTOEMULSION. EVENT WITH A TOTAL CHARGE OF ALL SPECTATOR FRAGMENTS OF A PROJECTILE = 0.

Table 2

NUCLEUS IS NUCLEAR PHOTOEMULSION. EVENT WITH A TOTAL CHARGET OF ALL SPECTATOR FRAGMENTS OF A PROJECTILE = 1.

Table 3

NUCLEUS IS NUCLEAR PHOTOEMULSION.

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EXPERIMENTAL DATA ON MULTIPLICITIES IN CENTRAL COLLISIONS C-12 + C-12, F-19 + MG-24, MG-24 + MG-24 AT 3.7-GEV/NUCLEON. (IN RUSSIAN)

Anikina, M.Kh. ; Abdurakhimov, A.U. ; Avramenko, S.A. ; et al.

DUBNA JINR - 1(34)-89 (89,REC.APR.) 12-19, 1989.

Inspire Record 282227 DOI 10.17182/hepdata.38295

None

9 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Fragmentation of Ne-22 in Emulsion at 4.1-a/GeV/c

El-Naghy, A. ; Krasnov, S.A. ; Tolstov, K.D. ; et al.

J.Phys.G 14 (1988) 1125-1137, 1988.

Inspire Record 251875 DOI 10.17182/hepdata.39460

Charge distributions of projectile fragments produced in the interactions of 22Ne beams with emulsion at 4.1A GeV/c have been studied. Correlations between projectile and target fragments and among projectile fragments are presented. The change of charge yield distribution with the violence of the collision has been shown. The present analysis contradicts theoretical calculations describing the inclusive charge yield distribution of fragments by a single process.

4 data tables

Table 1

Table 2

Table 3

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