Thursday, June 27, 2013

1306.6171 (A. E. Kaloshin et al.)

Opposite parity fermion mixing and baryons $1/2^{\pm}$    [PDF]

A. E. Kaloshin, E. A. Kobeleva, V. P. Lomov
We develop a variant of $K$-matrix, which includes the effect of opposite parity fermions (OPF) mixing, and apply it for description of $\pi N$ partial waves $S_{11}$ and $P_{11}$. OPF-mixing leads to appearance of negative energy poles in $K$-matrix and restoration of MacDowell symmetry, relating two partial waves. Joint analysis of PWA results for $S_{11}$ and $P_{11}$ confirms significance of this effect.
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