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Evidence for b flavored baryon production in Z0 decays at LEP

The OPAL collaboration Acton, P.D. ; Alexander, G. ; Allison, J. ; et al.
Phys.Lett.B 281 (1992) 394-404, 1992.
Inspire Record 333300 DOI 10.17182/hepdata.48511

We observe evidence for the production of b-flavoured baryons in decays of the Z 0 boson with the OPAL detector at LEP. We find 68 Λl − , Λ l + candidates in 458 583 hadronic Z 0 decays. We interpret this as a signal of 55 ± 9 +0.3 −3.1 events from the semi-leptonic decays of b baryons. Assuming weakly decaying b baryons produced in Z 0 decays are mostly Λ b particles, we measure the product branching ratio (Γ b b /Γ had ) f ( b →Λ b ) B (Λ b →Λl − v X ) , averaged over the electron and muon channels, to be (6.2±1.0±1.5)×10 −4 .

1 data table
Table 1

FD is considered as a quark fragmentation fraction. Charge conjugated state is understood.


MEASUREMENT OF THE SPIN DEPENDENT PARAMETERS D, R, A, AND P FOR SMALL ANGLE P P ELASTIC SCATTERING BETWEEN 300-MeV AND 600-MeV

Besset, D. ; Do, Q.H. ; Favier, B. ; et al.
Phys.Rev.D 21 (1980) 580-598, 1980.
Inspire Record 157432 DOI 10.17182/hepdata.24184

The Wolfenstein parameters D, R, and A and the polarization parameter P have been measured for p−p elastic scattering at 312, 392, 493, and 575 MeV kinetic energy. The center-of-mass angular range observed was from 3° to 33°. The experiment was performed at SIN, using a polarized proton beam. These data significantly improve the determination of I=1 phase shifts.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

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Evidence for decays of the d- and e-mesons into delta pi in anti-p p annihilation at 700 mev/c

Defoix, C. ; Do Nascimento, A. ; O' Neall, J.S. ; et al.
Nucl.Phys.B 44 (1972) 125-141, 1972.
Inspire Record 75085 DOI 10.17182/hepdata.32849

A study is made of η 0 production in p p → 3π + 3π − π 0 (7500 events) at an incident momentum of 720 MeV/ c . The reaction is dominated by production of ω 0 (≈68 o/o). The η o production has been studied by means of two independent methods: the first, a study of correlations between the (4 π ) ± and (5 π ) 0 and the (3 π ) 0 systems, circumvents the problem of ω 0 reflections. The second attempts to isolate the η 0 4π channel by means of rigorous selections using the decay properties of η 0 and ω 0 . The results of the two methods are consistent and confirnm the production of σ +- , D 0 and E 0 with the decays ifD 0 → σ ± π ± → η 0 π + π ( su −), E 0 → σ ± π ∓ → η ( su 0) π + π − , E 0 → η 0 π + π − .

1 data table
Table 1

CORRECTED FOR UNOBSERVED ETA DECAYS AND I=0 ASSUMED FOR ETAPRIME, D(1285) AND E(1420) --> ETA PI0 PI0.