Backward spin polarizability gamma(pi) of the proton
/ Authors
M. Camen, K. Kossert, F. Wissmann, J. Ahrens, H. Arends, R. Beck, G. Caselotti, P. Grabmayr, P. Harty, O. Jahn
and 14 more authors
P. Jennewein, R. Kondratiev, M. Levchuk, V. Lisin, A. L’vov, J. Mcgeorge, A. Natter, V. de Leon, M. Schumacher, B. Seitz, F. Smend, A. Thomas, W. Weihofen, F. Zapadtka
/ Abstract
Using the Mainz 48cmO × 64cm NaI(Tl) detector and the segmented Gottingen recoil detector SENECA in coincidence, Compton scattering by the proton atlab = 136 ◦ has been measured at MAMI (Mainz) in the en- ergy range from 200 to 470 MeV. The new data confirm the previous ob- servation that there is a systematic discrepancy between MAMI and LEGS (Brookhaven) data leading to different spin polarizabilities � = 38.7 ± 1.8 and 27.2 ± 3.1 (×10 −4 fm 4 ), respectively.
Journal: Physical Review C