Notes

Measurement of polarization observables of the associated strangeness production in proton proton interactions

“…Most of these measurements are inclusive, and thus the separation of directly produced Λ from Σ 0 Ñ γΛ decay is not possible. The first determination of the Σ 0 polarization [31] yields a value of « 30% with opposite sign [20] p+Be (Cu,W)Ñ Λ+X 12.9 GeV/c CERN ISR 1987 [21] p+p Ñ Λ+X ? s = 3-61 GeV AGS 1988 13.5 GeV/c [7] p+Be Ñ Λ+X 13.5 GeV/c AGS 1988 18.5 GeV/c [7] p+Be Ñ Λ+X 18.5 GeV/c AGS 1996 [22,23] p+p Ñ pK`Λ N(π`π´) 27.5 GeV/c FNAL 1989 [24] p+Be (Cu,Pb) Ñ Λ+X 400.9 GeV/c FNAL 1991 [25] p+p Ñ pK`Λ 800.9 GeV/c FNAL 1994 [26] p+Be Ñ Λ+X 800.9 GeV/c DISTO 1998 [4] p+p Ñ pK`Λ 3.67 GeV/c CERN NA48 1999 [27] p+Be Ñ Λ+X ?…”

Measurement of the ratio of Σ0/Λ inclusive production and the Σ0 and Λ polarizations by 28.5 GeV/C protons on beryllium

“…We report here on the first measurements of the polarization of inclusively produced X ° hypcrons. 2 The polarization of the A has been investigated most extensively, but despite the large amount of effort expended in understanding its polarization, none of the expcrirncnts have addressed a fundamental experimental question: determining the contamination in their A data from A's resulting from the decay of other particles or resonances. This contamination could be large and is presumably dominated by A's from Z ° decay: Z ° -~ A+~,.…”