/ hep-ex arXiv:1506.08849

Measurement of $\pi^0$ photoproduction on the proton at MAMI C

Adlarson, P. (Mainz U., Inst. Kernphys.) ; Afzal, F. (Bonn U., HISKP) ; Akondi, C.S. (Kent State U.) ; Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U., Inst. Kernphys.) ; Azimov, Ya. I. (St. Petersburg, INP) ; Beck, R. (Bonn U., HISKP) ; Borisov, N. (Dubna, JINR) ; Braghieri, A. (INFN, Pavia) ; Briscoe, W.J. (George Washington U.) ; Cherepnya, S. (Lebedev Inst.) ; Cividini, F. (Mainz U., Inst. Kernphys.) ; Collicott, C. (St. Mary's U., Halifax) ; Costanza, S. (Pavia U.) ; Denig, A. (Mainz U., Inst. Kernphys.) ; Downie, E.J. (George Washington U.) ; Dieterle, M. (Basel U.) ; Bondy, M.I. Ferretti (Mainz U., Inst. Kernphys.) ; Fil'kov, L.V. (Lebedev Inst.) ; Fix, A. (Tomsk Polytechnic U.) ; Gardner, S. (Glasgow U.) ; Garni, S. (Basel U.) ; Glazier, D.I. (Edinburgh U.) ; Glowa, D. (Edinburgh U.) ; Gradl, W. (Mainz U., Inst. Kernphys.) ; Gurevich, G. (Moscow, INR) ; Hamilton, D.J. (Glasgow U.) ; Hornidge, D. (Mt. Allison U.) ; Huber, G.M. (Regina U.) ; Kaser, A. (Basel U.) ; Kashevarov, V.L. (Lebedev Inst.) ; Kay, S. (Edinburgh U.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Moscow, INR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Krusche, B. (Basel U.) ; Kulikov, V.V. (Kurchatov Inst., Moscow) ; Lazarev, A. (Dubna, JINR) ; Linturi, J. (Mainz U., Inst. Kernphys.) ; Lisin, V. (Lebedev Inst.) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Manley, D.M. (Kent State U.) ; Martel, P.P. (Massachusetts U., Amherst) ; Martemianov, M. (Kurchatov Inst., Moscow) ; McGeorge, J.C. (Glasgow U.) ; Meyer, W. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Middleton, D.G. (Mt. Allison U.) ; Miskimen, R. (Massachusetts U., Amherst) ; Mushkarenkov, A. (Massachusetts U., Amherst) ; Neganov, A. (Dubna, JINR) ; Neiser, A. (Mainz U., Inst. Kernphys.) ; Oberle, M. (Basel U.) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Ott, P. (Mainz U., Inst. Kernphys.) ; Otte, P.B. (Mainz U., Inst. Kernphys.) ; Oussena, B. (George Washington U.) ; Paudyal, D. (Regina U.) ; Pedroni, P. (INFN, Pavia) ; Polonski, A. (Moscow, INR) ; Polyanski, V.V. (Lebedev Inst.) ; Prakhov, S. (UCLA) ; Rajabi, A. (Massachusetts U., Amherst) ; Reicherz, G. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Ron, G. (Hebrew U.) ; Rostomyan, T. (Basel U.) ; Sarty, A. (St. Mary's U., Halifax) ; Schott, D.M. (George Washington U.) ; Schumann, S. (Mainz U., Inst. Kernphys.) ; Sfienti, C. (Mainz U., Inst. Kernphys.) ; Sokhoyan, V. (George Washington U.) ; Spieker, K. (Bonn U., HISKP) ; Steffen, O. (Mainz U., Inst. Kernphys.) ; Strakovsky, I.I. (George Washington U.) ; Strub, Th. (Basel U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Taragin, M.F. (George Washington U.) ; Thiel, A. (Bonn U., HISKP) ; Thiel, M. (Mainz U., Inst. Kernphys.) ; Tiator, L. (Mainz U., Inst. Kernphys.) ; Thomas, A. (Mainz U., Inst. Kernphys.) ; Unverzagt, M. (Mainz U., Inst. Kernphys.) ; Usov, Yu. A. (Dubna, JINR) ; Wagner, S. (Mainz U., Inst. Kernphys.) ; Watts, D.P. (Edinburgh U.) ; Werthmuller, D. (Basel U.) ; Wettig, J. (Mainz U., Inst. Kernphys.) ; Witthauer, L. (Basel U.) ; Wolfes, M. (Mainz U., Inst. Kernphys.) ; Workman, R.L. (George Washington U.) ; Zana, L.A. (Edinburgh U.)

Pages: 13

Abstract: Differential cross sections for the gamma p -> pi^0 p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi^0 photoproduction data by ~47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented.

Web-Page: http://inspirehep.net/record/1380445/files/dcs_pi0p_leg_coef6_10_syst_fig12.png; http://inspirehep.net/record/1380445/files/dcs_pi0p_e318_apr13_fig1.png; http://inspirehep.net/record/1380445/files/dcs_pi0p_e1512_oct14_fig3.png; http://inspirehep.net/record/1380445/files/dcs_pi0p_e1202_apr13_fig2.png; http://inspirehep.net/record/1380445/files/dxs_pi0p_a2_pwa_fig7.png; http://inspirehep.net/record/1380445/files/dxs_ang_pi0p_a2_pwa_fig9.png; http://inspirehep.net/record/1380445/files/dxs_pi0p_a2_3runs_fig4.png; http://inspirehep.net/record/1380445/files/leg_fit_chi2_fig11.png; http://inspirehep.net/record/1380445/files/txs_pi0p_a2_comp_fig6.png; http://inspirehep.net/record/1380445/files/dcs_pi0p_e546_fig10a.png; http://inspirehep.net/record/1380445/files/dcs_pi0p_th180_fig10b.png; http://inspirehep.net/record/1380445/files/dxs_pi0p_a2_exp_fig5.png; http://inspirehep.net/record/1380445/files/xchi2_vs_eg_fig8b.png; http://inspirehep.net/record/1380445/files/chi2_vs_eg_fig8a.png; http://inspirehep.net/record/1380445/files/arXiv:1506.08849.pdf

Note: 13 pages, 12 figures, 1 table

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