Scalar-isoscalar mesons in pion production at threshold

Details Scalar-isoscalar mesons in pion production at threshold Scalar-isoscalar mesons in pion production at threshold

1999-05-24

arxiv.org/abs/nucl-th/9905052v2

Physics

Nuclear Physics

Nuclear Theory

Non-relativistic approximations added, one new table inserted

Scientific paper

We present the contributions of the non-linear chiral scalar field S to cross sections of $pp\to d\pi ^{+}, pp\to pn\pi ^{+}$ and $pp\to pp\pi ^0$ reactions at threshold. We compare our results with the meson $\sigma$ contribution from the $\sigma$-linear model. We show that the chiral scalar field S is almost 5 times bigger than the other contributions, which indicates that the two-pion exchange dynamics embebbed in the S field is the most important term for the pion production at threshold.

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