Measurements of δσL(pp) and δσL(bar pp) at 200 GeV/c

A measurement was made at Fermilab of the difference in the total cross sections between states with beam and target polarizations aligned antiparallel and parallel, δσL=δσ(right-reversible)-δ(σsq bullet) using 200-GeV/c, polarized proton and antiproton beams and a polarized proton target. This measurement explores the spin dependence of particle interactions and the constituent dynamics. A difference in the spin-dependent total cross sections has been observed in previous experiments at lower energies, and this experiment was the first to explore possible spin effects in δσL at much higher energies. copyright 1995 American Institute of Physics