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Relativistic effects in a three-body calculation of the $np\to\eta d$ processare considered. Relativistic effects on the range and strength of the pionexchange contribution to the reaction mechanism may be large, but boost effectsof the two-body interactions are negligible. The relativistic calculationconfirms previous non-relativistic results, showing that the shape of the crosssection near threshold is essentially determined by the $\eta d$ final-stateinteraction alone. As for the region away from threshold, the relativistic pionexchange contribution is seen to dominate the other mechanisms of the reaction.It turns out that, within the relativistic reaction model, the $np\to\eta d$experimental data excludes large values for the real part of the $\eta N$scattering length.Comment: 18 pages 5 figures submitted to Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

Relativistic description of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="italic">np</mml:mi><mml:mo>→</mml:mo><mml:mi>η</mml:mi><mml:mi>d</mml:mi></mml:mrow></mml:math>reaction near threshold

Relativistic description of thenp→ηdreaction near threshold