Measurement of π0 photoproduction on the proton at MAMI C

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

*Corresponding author for this work

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Abstract

Differential cross sections for the γp→π0p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of π0 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.

Original languageAmerican English
Article number024617
JournalPhysical Review C - Nuclear Physics
Volume92
Issue number2
DOIs
StatePublished - 24 Aug 2015

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Publisher Copyright:
© 2015 American Physical Society. ©2015 American Physical Society.

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