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Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 46: Electromagnetic and Hadronic Probes VI

HK 46.5: Vortrag

Donnerstag, 14. März 2002, 17:30–17:45, D

Total cross section of the π p → π0 n charge exchange reaction — •J. Breitschopf1, H. Clement1, M. Cröni1, H. Denz1, E. Friedman2, P. Jesinger1, R. Meier1, and G. J. Wagner11Physikalisches Institut, Universität Tübingen — 2Racah Institute of Physics, The Hebrew University, Jerusalem, Israel

The mass difference of up- and down-quarks is the origin of isospin violation in the strong interaction. Isospin breaking can in principle be tested in a number of ways in the pion-nucleon system. Currently experimentally accessible is the comparison of elastic scattering of positively and negatively charged pions from protons with the charge exchange reaction π p → π0 n (SCX). Analyses of this system, based on the existing scattering data base, found unexpectedly large isospin breaking in s-waves for pion energies below 100 MeV. These analyses probably are not suffficiently restricted by the low amount of SCX data. Therefore, further measurements of SCX cross sections and analyzing powers are needed to test this result.
A measurement of the SCX total cross section in the energy region from 30 to 250 MeV has been started at PSI. The experiment employs a transmission technique using a 4π box detector consisting of thin plastic scintillators. A first beam time covered the high energy part from 60 to 250 MeV, a second beam time in 2002 will take data from 30 to 90 MeV. The measuring procedure and the status of the experiment are discussed. This work is supported by BMBF (06Tü987I) and DFG (Europäisches Graduiertenkolleg Basel-Tübingen).

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