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Measurement of the absolute differential cross section of proton-proton elastic scattering at small angles

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arxiv 1510.06162 v1 pith:4XDDKD2C submitted 2015-10-21 nucl-ex nucl-th

D. Mchedlishvili , D. Chiladze , S. Dymov , Z. Bagdasarian , S. Barsov , R. Gebel , B. Gou , M. Hartmann
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A. Kacharava I. Keshelashvili A. Khoukaz P. Kulessa A. Kulikov A. Lehrach N. Lomidze B. Lorentz R. Maier G. Macharashvili S. Merzliakov S. Mikirtychyants M. Nioradze H. Ohm D. Prasuhn F. Rathmann V. Serdyuk D. Schroer V. Shmakova R. Stassen H.J. Stein H. Stockhorst I.I. Strakovsky H. Ströher M. Tabidze A. Täschner S. Trusov D. Tsirkov Yu. Uzikov Yu. Valdau C. Wilkin R.L. Workman P. Wüstner
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The differential cross section for proton-proton elastic scattering has been measured at a beam energy of 1.0 GeV and in 200 MeV steps from 1.6 to 2.8 GeV for centre-of-mass angles in the range from 12-16 degrees to 25-30 degrees, depending on the energy. Absolute normalisations of typically 3% were achieved by studying the energy losses of the circulating beam of the COSY storage ring as it passed repeatedly through the windowless hydrogen target of the ANKE magnetic spectrometer. It is shown that the data have a significant impact upon a partial wave analysis. After extrapolating the differential cross sections to the forward direction, the results are broadly compatible with the predictions of forward dispersion relations.

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