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Energy Dependence of Spin Spin Forces in 90-degrees (Center-of-mass) Elastic $p p$ Scattering

Lin, A. ; O'Fallon, J.R. ; Ratner, L.G. ; et al.

Phys.Lett.B 74 (1978) 273-276, 1978.

Inspire Record 129169 DOI 10.17182/hepdata.27461

We measured d σ d t(90° cm ) for ↑+ p ↑→ p + p from 1.75 to 5.5 GeV/ c , using the Argonne zero-gradient synchrotron 70% polarized proton beam and a 70% polarized proton target. We found that the spin-spin correlation parameter. A nn , equals 60% at low energy, then drops sharply to about 10% near 3.5 GeV/ c , and remains constant up to 5.5 GeV/ c .

2 data tables

Table 1

ANALYZING POWER. QUOTED ERRORS DUE TO 4.3 PCT POINT TO POINT RELATIVE ERROR.

Table 2

THE SPIN-SPIN CORRELATION PARAMETER CNN IS NOW DENOTED BY ANN ACCORDING TO THE NEW ANN ARBOR CONVENTION.

The Reaction anti-p p --> anti-Lambda Lambda Between 1.50-GeV/c and 2.06-GeV/c

Jayet, B. ; Gailloud, M. ; Rosselet, P. ; et al.

Nuovo Cim.A 45 (1978) 371-388, 1978.

Inspire Record 135059 DOI 10.17182/hepdata.37573

The reaction$\bar pp \to \bar \Lambda \Lambda $ has been studied in a bubble chamber experiment at eight incident momenta between 1.50 and 2.06 GeV/c. The differential cross-section, the polarization and the spin correlation coefficients have been measured. They have been compared with the prediction of two theoretical models: the K-meson conspiracy and the exchange of the K*K** degenerate trajectory associated with a Regge cut. The latter model gives the best representation of the data.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

POLARIZATION AND SPIN CORRELATION COEFFICIENTS. AVERAGED OVER ALL ANGLES. SEE PAPER FOR DEFINITIONS, MORE DETAILS AND POSSIBLE T-DEPENDENCE.