Accurate Test of Chiral Dynamics in the (gamma)over-right-arrowp -%26gt; pi(0) p Reaction

作者：Hornidge D^*; Bartolome P Aguar; Annand J R M; Arends H J; Beck R; Bekrenev V; Berghaeuser H; Bernstein A M; Braghieri A; Briscoe W J; Cherepnya S; Dieterle M; Downie E J; Drexler P; Fernandez Ramirez C; Filkov L V; Glazier D I; Barrientos P Hall; Heid E; Hilt M; Jaegle I; Jahn O; Jude T C; Kashevarov V L; Keshelashvili I; Kondratiev R; Korolija M; Koulbardis A; Krambrich D; Kruglov S; Krusche B; Laffoley A T; Lisin V

来源：Physical Review Letters, 2013, 111(6): 062004.

DOI：10.1103/PhysRevLett.111.062004

A precision measurement of the differential cross sections d sigma/d Omega and the linearly polarized photon asymmetry Sigma equivalent to (d alpha(perpendicular to) - d sigma(parallel to))/(d alpha(perpendicular to) + d sigma(parallel to) for the (gamma) over right arrowp -%26gt; pi(0) p reaction in the near-threshold region has been performed with a tagged photon beam and almost 4 pi detector at the Mainz Microtron. The Glasgow-Mainz photon tagging facility along with the Crystal Ball/TAPS multiphoton detector system and a cryogenic liquid hydrogen target were used. These data allowed for a precise determination of the energy dependence of the real parts of the S- and all three P-wave amplitudes for the first time and provide the most stringent test to date of the predictions of chiral perturbation theory and its energy region of agreement with experiment.

• 出版日期2013-8-7