New experimental upper limit of the electron-proton spin-flip cross section

D Oellers,C Weidemann,P Lenisa,H O Meyer,F Rathmann, S Trusov,W Augustyniak,Z Bagdasarian, L Barion,S G Barsov,U Bechstedt,S Bertelli, V Carassiti,D Chiladze,G Ciullo,M Contalbrigo,P F Dalpiaz,S Dymov,R Engels, M Gaisser,R Gebel,P Goslawski, K Grigoriev, G Guidoboni,A Kacharava,A Khoukaz,A I Kulikov,H Kleines, G Langenberg,A Lehrach,N Lomidze,B Lorentz,G Macharashvili, R Maier,B Marianski,S Martin,D Mchedlishvili,S Merzliakov,I N Meshkov, M Mielke, M Mikirtychiants,S Mikirtychiants,A Nass,N N Nikolaev,M Nioradze,M Papenbrock, L L Pappalardo, A Pesce,D Prasuhn, J Sarkadi,R Schleichert,A Smirnov,H Seyfarth,M Statera,E Steffens,H J Stein,H Stockhorst, H Stroeher, M D Tabidze,G Tagliente,Pia Thorngren Engblom, A Trzcinski,Yu Valdau, A N Vasiliev, P Wuestner,P Zupranski

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2014）

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摘要

In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 ×107 b for the electron–proton spin-flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that also makes use of non-identified particles.

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关键词

Polarized beams,Storage rings,Electron–proton scattering,Antiprotons

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