Left-Right Asymmetry in $\bar{p}p \rightarrow π^- π^+$

Details Left-Right Asymmetry in $\bar{p}p \rightarrow π^- π^+$ Left-Right Asymmetry in $\bar{p}p \rightarrow π^- π^+$

1993-03-16

arxiv.org/abs/nucl-th/9303012v1

Phys.Rev.C47:2207-2212,1993

Physics

Nuclear Physics

Nuclear Theory

LATEX, 11 pages, 6 figures (available upon request), #RU9305

Scientific paper

10.1103/PhysRevC.47.2207

Results for d$\sigma$/d$\Omega$ and $A_N$ in the reaction $\bar{p}p \rightarrow \pi^- \pi^+$ are predicted by a simple quark model. They are compared to recent experimental data from LEAR, as well as to previous predictions from nucleon-exchange models. At low energy the quark model does better than the nucleon-exchange models, but the overall comparison to experiment remains poor. In particular, the double-dip structure of the experimental $A_N$ data is only partly represented. This shortcoming of the simple quark model is traced back to a too small J=2 amplitude. This has interesting implications for the range of this specific annihilation process.

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