| Hovedsiden > Measurements of the spin rotation parameterf A in the elastic pion- proton scattering in the D$_{13}$(1700) resonance region |
| Article | |
| Title | Measurements of the spin rotation parameterf A in the elastic pion- proton scattering in the D$_{13}$(1700) resonance region |
| Author(s) | Alekseev, I G ; Bazhanov, N A ; Beloglasov, Yu A ; Budkovsky, P E ; Bunyatova, E I ; Kanavets, V P ; Kovalev, A I ; Koroleva, L I ; Kruglov, S P ; Morozov, B V ; Nesterov, V M ; Novinsky, D V ; Ryltzov, V V ; Shchedrov, V A ; Sulimov, A D ; Sumachev, Yu V ; Svirida, D N ; Trautman, V Yu ; Zhurkin, V V |
| Affiliation | (Inst for Theor & Exp Phys) |
| Publication | 2001 |
| In: | Eur. Phys. J. A 12, 1 (2001) pp.117-20 |
| Subject category | Particle Physics - Experiment |
| Abstract | The spin rotation parameters A and R were measured for the elastic pion-proton scattering by the PNPI-ITEP collaboration in the D/sub 13 /(1700) resonance region. The main goal of the experimental program is to resolve the current partial-wave analyses (PWA) uncertainties. Simultaneously with A and R the polarization parameter P was measured with the purpose to improve the experimental database and estimate systematic errors. The constraint which demands a smooth energy dependence of all pi /sup -/p transverse amplitude zeros in the complex plane together with the new experimental data on the A parameter can lead to the conclusion that the Barrelet branch of "zero trajectories" is chosen improperly in PWA of the Carnegie- Mellon-Lawrence-Berkeley-Laboratory groups at the range of the pion beam momentum near 1.0 GeV/c. The setup included a longitudinally polarized proton target with superconductive magnet, multiwire spark chambers and carbon polarimeter with thick filter. The experiment was performed at the ITEP proton synchrotron, Moscow. (15 refs). |