Measurement of the differences in the total cross section for antiparallel and parallel longitudinal spins and a measurement of parity nonconservation with incident polarized protons and antiprotons at 200 GeV/c
The highest-energy measurement of {Delta}{sigma}{sub L}(pp) and the first ever measurement of {Delta}{sigma}{sub L}({bar p}p), the differences between proton-proton and antiproton-proton total cross sections for pure longitudinal spin states, are described. Data were taken using 200-GeV/c polarized beams incident on a polarized-proton target. The results are measured to be {Delta}{sigma}{sub L}(pp)={minus}42{plus_minus}48(stat){plus_minus}53(syst) {mu}b and {Delta}{sigma}{sub L}({bar p}p)={minus}256{plus_minus}124(stat){plus_minus}109(syst) {mu}b. Many tests of systematic effects were investigated and are described, and a comparison to theoretical predictions is also given. Measurements of parity nonconservation at 200 GeV/c in proton scattering and the first ever of antiproton scattering have also been derived from these data. The values are consistent with zero at the 10{sup {minus}5} level. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Fermi National Accelerator Laboratory
- DOE Contract Number:
- AC02-76CH03000; AC02-76ER02289; AS05-76ER05096; FG02-91ER40664; W-31109-ENG-38; W-7405-ENG-36
- OSTI ID:
- 450527
- Journal Information:
- Physical Review, D, Vol. 55, Issue 3; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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