Test of isospin symmetry via low energy $^1$H($π^-$,$π^o$)$n$ charge exchange

Details Test of isospin symmetry via low energy $^1$H($π^-$,$π^o$)$n$ charge exchange Test of isospin symmetry via low energy $^1$H($π^-$,$π^o$)$n$ charge exchange

2008-04-09

arxiv.org/abs/0804.1531v1

Phys.Rev.Lett.101:102301,2008

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.102301

We report measurements of the $\pi^- p \to \pi^o n$ differential cross sections at six momenta (104-143 MeV/c) and four angles (0-40 deg) by detection of $\gamma$-ray pairs from $\pi^o \to \gamma \gamma$ decays using the TRIUMF RMC spectrometer. This region exhibits a vanishing zero-degree cross section from destructive interference between s-- and p--waves, thus yielding special sensitivity to pion-nucleon dynamics and isospin symmetry breaking. Our data and previous data do not agree, with important implications for earlier claims of large isospin violating effects in low energy pion-nucleon interactions.

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