Measurement of Spin Parameters for a Decisive Clarification of the Structure Observed in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:math>System

Abstract

Recent data are presented on spin-spin correlation parameters ${C}_{\mathrm{LL}}=(L,L;0,0)$ and ${C}_{\mathrm{SL}}=(S,L;0,0)$ at forward angles from 1.18 to 2.47 GeV/c incident momenta in proton-proton elastic scattering. Values for $\ensuremath{\Delta}{\ensuremath{\sigma}}_{L}$ (inelastic) are derived and are shown to disagree with predictions of theoretical models attempting to describe $p\ensuremath{-}p$ scattering without dibaryon resonances. Finally, the ${C}_{\mathrm{LL}}$ and ${C}_{\mathrm{SL}}$ data discriminate among various phase-shift solutions, and will lead to a clarification of the $p\ensuremath{-}p$ phase shifts.