Excitation functions of spin correlation parameters ANN,ASS, and ASL in elastic (→/p)(→/p) scattering between 0.45 and 2.5 GeV

Excitation functions of the spin correlation coefficients ANN(plab,θc.m.),ASS(plab,θc.m.), and ASL(plab,θc.m.) have been measured with the polarized proton beam of the Cooler Synchrotron and an internal polarized atomic beam target. Data were taken continuously during the acceleration for proton momenta plab ranging from 1000 to 3300 MeV/c (kinetic energies Tlab 450-2500 MeV) as well as for discrete momenta of 1430 MeV/c and above 1950 MeV/c covering angles θc.m. between 30 deg. and 90 deg. The data are of high internal consistency. Whereas ASL(plab,θc.m.) is small and without structures in the whole range, ANN and, even more, ASS show a pronounced energy dependence. The angular distributions for ASS are at variance with predictions of existing phase-shift analyses at energies beyond 800 MeV. The impact of our results on phase-shift solutions is discussed. The direct reconstruction of the scattering amplitudes from all available pp elastic scattering data considerably reduces the ambiguities of solutions