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


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

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

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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Publ.-Id: 20586