Backward spin polarizability gamma(pi) of the proton

ISSN
0556-2813
Date Issued
2002
Author(s)
Camen, M.
Kossert, K.
Wissmann, F.
Ahrens, J.
Arends, H. J.
Beck, R.
Caselotti, G.
Grabmayr, P.
Harty, P. D.
Jennewein, P.
Kondratiev, R.
Levchuk, M. I.
Lisin, V.
L'vov, A. I.
McGeorge, J. C.
Natter, A.
de Leon, V. O.
Schumacher, M.
Seitz, Bjoern
Smend, F.
Thomas, Andy
Weihofen, W.
Zapadtka, F.
DOI
10.1103/PhysRevC.65.032202
Abstract
Using the Mainz 48 cm 0 x 64 cm NaI(Tl) detector and the segmented Gottingen recoil detector SENECA in coincidence, Compton scattering by the proton at theta(gamma)(lab) = 136degrees has been measured at MAMI (Mainz) in the energy range from 200 to 470 MeV. The new data confirm the previous observation that there is a systematic discrepancy between MAMI and LEGS (Brookhaven) data leading to different spin polarizabilities gamma(pi) = -38.7 +/- 1.8 and -27.2 +/- 3.1 (x10(-4) fm(4)), respectively.