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Backward Spin Polarizability $\Gamma_\pi$ of the Proton by Camen, M.; Kossert, K.; Wissmann, F.; Ahrens, J.; Arends, H. -J.; Beck, R.; Caselotti, G.; Grabmayr, P.; Harty, P. D.; Jahn, O.; Jennenwein, P.; Kondratiev, R.; Levchuk, M. I.; Lisin, V.; L'vov, A. I.; McGeorge, J. C.; Natter, A.; de León, V. Olmos; Schumacher, M.; Seitz, B.; Smend, F.; Thomas, A.; Weihofen, W.; Zapadtka, F. is a scholarly article available to read on EtoBox.

What is Backward Spin Polarizability $\Gamma_\pi$ of the Proton about?

Using the Mainz $48 cm {\O}\times 64 cm$ NaI(Tl) detector and the segmented G\"ottingen recoil detector SENECA in coincidence, Compton scattering by the proton at $\theta^{lab}_\gamma = 136^\circ$ 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 $\gamma_\pi = - 38.7 \pm 1.8$ and $-27.2 \pm 3.1$ $(\times 10^{-4}fm^4)$, respectively.

Author

Camen, M.; Kossert, K.; Wissmann, F.; Ahrens, J.; Arends, H. -J.; Beck, R.; Caselotti, G.; Grabmayr, P.; Harty, P. D.; Jahn, O.; Jennenwein, P.; Kondratiev, R.; Levchuk, M. I.; Lisin, V.; L'vov, A. I.; McGeorge, J. C.; Natter, A.; de León, V. Olmos; Schumacher, M.; Seitz, B.; Smend, F.; Thomas, A.; Weihofen, W.; Zapadtka, F.

Published

2001

Language

EN