R608
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Test of {CP} Invariance in $\Lambda^0$ Decay

The R608 collaboration Chauvat, P. ; Erhan, S. ; Hayes, K. ; et al.
Phys.Lett.B 163 (1985) 273-276, 1985.
Inspire Record 216802 DOI 10.17182/hepdata.49640

In an experiment at the CERN intersecting storage rings with √ s = 31 GeV, we have measured αP , the product of asymmetry parameter and polarization, for Λ 0 's and Λ 0 's produced in p p and pp interactions, respectively. The ratio, (αP) Λ /(αP Λ = −1.04±0.29 , is consistent with the value −1, and constitutes the first test of CP invariance in Λ decay.

1 data table
Table 1

The ratio CONST/CONST is obtained under assumption of POL(LAMBDA) = POL(LAMBDABAR).


Production of $\Lambda(c$) With Large X(f) at the {ISR}

The R608 collaboration Chauvat, P. ; Cousins, R. ; Hayes, K. ; et al.
Phys.Lett.B 199 (1987) 304, 1987.
Inspire Record 250761 DOI 10.17182/hepdata.30058

We report results of an inclusive measurement of the charmed baryon, Λ c , in the forward direction of proton-proton interactions with s =63 GeV . The signal, seen in the final state Λ s π + π + π − , has 6.0 σ significance with about 620 events on a large background and corresponds to a cross section times branching ratio of 2.84±0.50±0.72 μ b for Feynman- x F > 0.5 in both hemispheres. Asymmetries are observed in the decay angular distributions which are characteristic of weak decays and have a combined 3.0 σ significance.

1 data table
Table 1

BR. RATIO WAS TAKEN TO BE 0.028+-0.007+-0.011.


Observation of Correlations Between Forward Protons and 90-degree Trigger Protons at S**1/2 = 62-{GeV}

The R608 collaboration Smith, A.M. ; Meritet, L. ; Reyrolle, M. ; et al.
Phys.Lett.B 184 (1987) 293-298, 1987.
Inspire Record 234498 DOI 10.17182/hepdata.30213

We study the production of π + 's and protons at 90° with p t>1.15 GeV and their correlations with forward protons. Fewer forward protons are observed for a 90° proton trigger than for a π + trigger. This is in qualitative agreement with the idea of an effective diquark scattering mechanism. Additionally, we observe that a K + produced at 90° is correlated with an enhanced forward production of λ O .

1 data table
Table 1

No description provided.


$\Lambda^0$ Polarization in Proton Proton Interactions From $sqrt{s} = 31$-{GeV} to 62-{GeV}

The R608 collaboration Smith, A.M. ; Bonino, R. ; Castellina, A. ; et al.
Phys.Lett.B 185 (1987) 209, 1987.
Inspire Record 235588 DOI 10.17182/hepdata.30196

We report Λ 0 -hyperon polarization measurements at the CERN intersecting storage rings from √ s of 31 to 62 GeV. P Λ 0 changes insignificantly, +(0.8±1.7)%, over this range of √ s . However, P Λ 0 is observed to grow with Feynman- x F and with transverse momentum. At an average p t of 1.1 GeV/ c , P Λ 0 depends linearly on x F and approaches −40% at x F =0.8.

1 data table
Table 1

No description provided.