Overseth, O.E.
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Polarization in Inclusive $\Lambda$ and $\bar{\Lambda}$ Production at Large $p_T$

Lundberg, B. ; Handler, R. ; Pondrom, L. ; et al.
Phys.Rev.D 40 (1989) 3557-3567, 1989.
Inspire Record 287809 DOI 10.17182/hepdata.23077

A study of the inclusive polarization of Λ hyperons produced by 400-GeV/c protons incident on nuclear targets has been performed at Fermilab. The polarization P of the Λ has been mapped over a large range of xF and pT to good precision for pT up to 3.8 GeV/c. The magnitude of the polarization at fixed xF rises with pT to a plateau at about 1 GeV/c, and the size of the plateau increases monotonically with xF. The Λ¯ were found to be unpolarized for pT<2.4 GeV/c. A target-nucleus dependence for the Λ polarization has been observed.

17 data tables
Table 1

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STUDY OF POLARIZATION IN EXCLUSIVE PROTON - DEUTERON BREAKUP REACTION p D ---> p p n AT 1-GeV

Aleshin, N.P. ; Belostotsky, S.L. ; Dotsenko, Yu.V. ; et al.
LENINGRAD-87-1259, 1987.
Inspire Record 247406 DOI 10.17182/hepdata.9284

None

4 data tables
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Polarization of Sigma0 hyperons in inclusive production from 28.5-GeV/c protons on beryllium

Dukes, E.C. ; Overseth, O.E. ; Bunce, G.M. ; et al.
Phys.Lett.B 193 (1987) 135-139, 1987.
Inspire Record 249257 DOI 10.17182/hepdata.30125

The polarization of Σ 0 hyperons produced in an inclusive reactons hasbeen measured for the first time. From a sample of 11 000 events produced by 28.5 GeV/ c ptorons in the reaction p+ Be → Σ 0 +X, the Σ 0 polarization has a value of +0.28±0.13 at p t =1.01 GeV/ c and x f =0.60. The polarization of 53 000 Λ hyperons produced from 28.5 Gev/ c protons inthe reaction p+Be→ Λ +X has been measured in the kinematic range 0.64< p t <1.14 GeV/ c and 0.42< x f <0.62. The average Λ polarization is found to be −0.188±0.024, consistent with previous results.

2 data tables
Table 1

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Measurements of Production Polarization and Decay Asymmetry for $\Xi^-$ Hyperons

Rameika, R. ; Beretvas, A. ; Deck, L. ; et al.
Phys.Rev.D 33 (1986) 3172-3179, 1986.
Inspire Record 233005 DOI 10.17182/hepdata.23517

The polarization of Ξ− hyperons produced by 400-GeV protons in the reaction p+Be→Ξ−+X has been measured as a function of momentum at two production angles. The average polarization for the full sample (192 110 events) was -0.108±0.007. Comparisons are made with polarization measurements for other hyperons produced under similar conditions. From the same data, αΛαΞ was measured to be -0.303±0.004±0.004, where αΛ is the asymmetry parameter in the decay Λ→pπ−, αΞ is the asymmetry parameter in the decay Ξ−→Λπ−, and the uncertainties are statistical and systematic, respectively. This yields αΞ=-0.472±0.006±0.011, where the systematic uncertainty is dominated by the uncertainty in αΛ. An updated test of the ΔI=1/2 rule in Ξ decay is presented.

2 data tables
Table 1

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Polarization of Cumulative Protons Produced in the Reaction $P$ a $\to P^\prime$ X at 1-{GeV}. (In Russian)

Belostotsky, S.L. ; Dotsenko, Yu.V. ; Ero, J. ; et al.
Sov.J.Nucl.Phys. 42 (1985) 904, 1985.
Inspire Record 210114 DOI 10.17182/hepdata.38015

None

10 data tables
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POLARIZATION OF XI0 AND LAMBDA HYPERONS PRODUCED BY 400-GEV/C PROTONS

Heller, Kenneth J. ; Cox, P.T. ; Dworkin, J. ; et al.
Phys.Rev.Lett. 51 (1983) 2025-2028, 1983.
Inspire Record 196831 DOI 10.17182/hepdata.20515

The polarization of Ξ0 and Λ hyperons produced by 400-GeV protons interacting with a beryllium target has been measured in the projectile fragmentation region. The Ξ0 polarization agrees in sign, magnitude, and kinematic behavior with that of Λ. The target dependence of these Ξ0 and Λ polarizations was also investigated with use of Cu and Pb targets.

2 data tables
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Polarization of $\Sigma^+$ Hyperons Produced by 400 GeV Protons

Wilkinson, C. ; Handler, R. ; Lundberg, B. ; et al.
Phys.Rev.Lett. 46 (1981) 803-806, 1981.
Inspire Record 169869 DOI 10.17182/hepdata.20646

The polarization of 26 000 Σ+ hyperons produced by 400-GeV protons on Be has been measured. The polarizations of Σ+ and Λ hyperons have the opposite sign. The magnitude increases with momentum at 5-mrad production angle, and averages 22% over the momentum range 140 to 280 GeV/c.

2 data tables
Table 1

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MEASUREMENT OF POLARIZATION IN ELASTIC p p SCATTERING AT 2.1-GeV/c IN THE REGION OF LOW MOMENTUM TRANSFER

Zhurkin, V.V. ; Ivanchenko, I.M. ; Kanavets, V.P. ; et al.
Yad.Fiz. 28 (1978) 1280-1286, 1978.
Inspire Record 131847 DOI 10.17182/hepdata.18968

None

2 data tables
Table 1

No description provided.

Table 2

Axis error includes +- 7/7 contribution.


HYPERON POLARIZATION IN LAMBDA P ELASTIC SCATTERING IN THE RANGE 60-GEV/C < P < 380-GEV/C

Edelman, B. ; Bunce, G. ; Devlin, T. ; et al.
Phys.Rev.Lett. 40 (1978) 491-494, 1978.
Inspire Record 131690 DOI 10.17182/hepdata.20918

Polarization of the scattered Λ has been measured in the reaction Λ+p→Λ+p. A total of 90 000 elastic events was recorded. Polarization was observed which decreased in magnitude with increasing momentum. For 0.1<~|t|<~0.4 GeV2 the polarization is P=−0.21±0.07 for p=110 GeV/c and is +0.01±0.04 at p=320 GeV/c. Results for 860 Λ¯−p elastic scatterings are also presented.

2 data tables
Table 1

90000 ELASTIC EVENTS.

Table 2

860 ELASTIC EVENTS.