Measurement of the H-1((gamma)over-right-arrow,(p)over-right-arrow)pi(0) Reaction Using a Novel Nucleon Spin Polarimeter
Date Issued
2014-01-01
Author(s)
Sikora, M. H.
Watts, D. P.
Glazier, D. I.
Aguar-Bartolome, P.
Akasoy, L. K.
Annand, J. R. M.
Arends, H. J.
Bantawa, K.
Beck, R.
Bekrenev, V. S.
Berghaeuser, H.
Braghieri, A.
Branford, D.
Briscoe, W. J.
Brudvik, J.
Cherepnya, S.
Codling, R. F. B.
Demissie, B. T.
Downie, E. J.
Drexler, P.
Fil'kov, L. V.
Freehart, B.
Gregor, R.
Hamilton, D.
Heid, E.
Hornidge, D.
Howdle, D. A.
Jaegle, I.
Jahn, O.
Jude, T. C.
Kashevarov, V. L.
Keshelashvili, I.
Kondratiev, R.
Korolija, M.
Kotulla, M.
Koulbardis, A. A.
Kruglov, S. P.
Lisin, V.
Livingston, K.
MacGregor, I. J. D.
Maghrbi, Y.
Manley, D. M.
Marinides, Z.
Martinez, M.
McGeorge, J. C.
McKinnon, B.
McNicoll, E. F.
Mekterovic, D.
Metag, V.
Micanovic, S.
Middleton, D. G.
Mushkarenkov, A.
Nefkens, B. M. K.
Nikolaev, A.
Novotny, R.
Ostrick, M.
Otte, P. B.
Oussena, B.
Pedroni, P.
Pheron, F.
Polonski, A.
Prakhov, S.
Robinson, J.
Rosner, G.
Rostomyan, T.
Schumann, S.
Sober, D. I.
Starostin, A.
Strakovsky, I. I.
Suarez, I. M.
Supek, I.
Thiel, M.
Thomas, A.
Unverzagt, M.
Werthmueller, D.
Workman, R. L.
Zamboni, I.
Zehr, F.
A2, Collaboration MAMI
DOI
10.1103/physrevlett.112.022501
Abstract
We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon. The measurement pioneers a novel polarimetry technique, which can be applied to many other nuclear and hadron physics experiments. The commissioning reaction of 1H((gamma) over bar, (p) over bar)pi(0) in the range 0.4 < E-gamma < 1.4 GeV validates the technique and provides essential new data to constrain the excitation spectrum of the nucleon.