/ Experiment-Nucl

T and F asymmetries in $π^0$ photoproduction on the proton

Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U., Inst. Kernphys.) ; Beck, R. (Bonn U., HISKP) ; Borisov, N. (Dubna, JINR) ; Braghieri, A. (INFN, Pavia) ; Briscoe, W.J. (George Washington U.) ; Cherepnya, S. (Lebedev Inst.) ; Collicott, C. (St. Mary's U., Halifax) ; Costanza, S. (INFN, Pavia) ; Downie, E.J. (George Washington U.) ; Dieterle, M. (Basel U.) ; Fix, A. (Tomsk Polytechnic U.) ; Fil'kov, L.V. (Lebedev Inst.) ; Garni, S. (Basel U.) ; Glazier, D.I. (Edinburgh U.) ; Gradl, W. (Mainz U., Inst. Kernphys.) ; Gurevich, G. (Moscow, INR) ; Hall Barrientos, P. (Edinburgh U.) ; Hamilton, D. (Glasgow U.) ; Hornidge, D. (Mt. Allison U.) ; Howdle, D. (Glasgow U.) ; Huber, G.M. (Regina U.) ; Kashevarov, V.L. (Lebedev Inst.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Moscow, INR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Krusche, B. (Basel U.) ; Lazarev, A. (Dubna, JINR) ; Lisin, V. (Lebedev Inst.) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Mancel, J. (Glasgow U.) ; Manley, D.M. (Kent State U.) ; Martel, P.P. (Massachusetts U., Amherst) ; McNicoll, E.F. (Glasgow U.) ; Meyer, W. (Ruhr U., Bochum) ; Middleton, D.G. (Mt. Allison U.) ; Miskimen, R. (Massachusetts U., Amherst) ; Mushkarenkov, A. (Massachusetts U., Amherst) ; Neganov, A. (Dubna, JINR) ; Nikolaev, A. (Bonn U., HISKP) ; Oberle, M. (Basel U.) ; Ortega, H. (Mainz U., Inst. Kernphys.) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Ott, P. (Mainz U., Inst. Kernphys.) ; Otte, P.B. (Mainz U., Inst. Kernphys.) ; Oussena, B. (George Washington U.) ; Pedroni, P. (INFN, Pavia) ; Polonski, A. (Moscow, INR) ; Polyanski, V.V. (Lebedev Inst.) ; Prakhov, S. (UCLA) ; Reicherz, G. (Ruhr U., Bochum) ; Rostomyan, T. (Basel U.) ; Sarty, A. (St. Mary's U., Halifax) ; Schumann, S. (Mainz U., Inst. Kernphys.) ; Steffen, O. (Mainz U., Inst. Kernphys.) ; Strakovsky, I.I. (George Washington U.) ; Strub, Th. (Basel U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Tiator, L. (Mainz U., Inst. Kernphys.) ; Thomas, A. (Mainz U., Inst. Kernphys.) ; Unverzagt, M. (Mainz U., Inst. Kernphys.) ; Usov, Yu. A. (Dubna, JINR) ; Watts, D.P. (Edinburgh U.) ; Werthmüller, D. (Basel U.) ; Witthauer, L. (Basel U.) ; Wolfes, M. (Mainz U., Inst. Kernphys.)

Published in: Phys.Rev.
Year: 2016
Vol.: C93    Num./Issue: 5
Page No: 055209
Pages: 10
Year: 2016-05-31 published

Abstract: The γp→π0p reaction was studied at laboratory photon energies from 425 to 1445 MeV with a transversely polarized target and a longitudinally polarized beam. The beam-target asymmetry F was measured for the first time and new high precision data for the target asymmetry T were obtained. The experiment was performed at the photon tagging facility of the Mainz Microtron (MAMI) using the Crystal Ball and TAPS photon spectrometers. The polarized cross sections were expanded in terms of associated Legendre functions and compared to recent predictions from several partial-wave analyses. The impact of the new data on our understanding of the underlying partial-wave amplitudes and baryon resonance contributions is discussed.

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DOI: 10.1103/PhysRevC.93.055209
 Record created 2016-07-04, last modified 2016-07-04

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