Measurement of pi⁰ photoproduction on the proton at MAMI C
Adlarson, P. · Afzal, F. · Akondi, C. S. · Annand, J. R. M. · Arends, H. J. · Azimov, Ya. I. · Beck, R. · Borisov, N. · Braghieri, A. · Briscoe, W. J. · Cherepnya, S. · Cividini, F. · Collicott, C. · Costanza, S. · Denig, A. · Downie, E. J. · Dieterle, M. · Bondy, M. I. Ferretti · Fil'kov, L. V. · Fix, A. · Gardner, S. · Garni, S. · Glazier, D. I. · Glowa, D. · Gradl, W. · Gurevich, G. · Hamilton, D. J. · Hornidge, D. · Huber, G. M. · Käser, A. · Kashevarov, V. L. · Kay, S. · Keshelashvili, I. · Kondratiev, R. · Korolija, M. · Krusche, B. · Kulikov, V. V. · Lazarev, A. · Linturi, J. · Lisin, V. · Livingston, K. · MacGregor, I. J. D. · Manley, D. M. · Martel, P. P. · Martemianov, M. · McGeorge, J. C. · Meyer, W. · Middleton, D. G. · Miskimen, R. · Mushkarenkov, A. · Neganov, A. · Neiser, A. · Oberle, M. · Ostrick, M. · Ott, P. · Otte, P. B. · Oussena, B. · Paudyal, D. · Pedroni, P. · Polonski, A. · Polyanski, V. V. · Prakhov, S. · Rajabi, A. · Reicherz, G. · Ron, G. · Rostomyan, T. · Sarty, A. · Schott, D. M. · Schumann, S. · Sfienti, C. · Sokhoyan, V. · Spieker, K. · Steffen, O. · Strakovsky, I. I. · Strub, Th. · Supek, I. · Taragin, M. F. · Thiel, A. · Thiel, M. · Tiator, L. · Thomas, A. · Unverzagt, M. · Usov, Yu. A. · Wagner, S. · Watts, D. P. · Werthmüller, D. · Wettig, J. · Witthauer, L. · Wolfes, M. · Workman, R. L. · Zana, L. A.
Original · EN
Differential cross sections for the gamma p -> pi⁰ 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 pi⁰ 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.
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