Role of the Delta(1232) in pion-deuteron scattering at threshold within chiral effective field theory

Details Role of the Delta(1232) in pion-deuteron scattering at threshold within chiral effective field theory Role of the Delta(1232) in pion-deuteron scattering at threshold within chiral effective field theory

2007-06-27

arxiv.org/abs/0706.4023v1

Phys.Lett.B659:184-191,2008

Physics

Nuclear Physics

Nuclear Theory

11 pages

Scientific paper

10.1016/j.physletb.2007.10.063

We investigate the role of the delta isobar in the reaction $\pi d\to \pi d$ at threshold in chiral effective field theory. We discuss the corresponding power counting and argue that this calculation completes the evaluation of diagrams up to the order (m_pi/M_N)^(3/2), with m_pi (M_N) for the pion (nucleon) mass. The net effect of all delta contributions at this order to the pion-deuteron scattering length is (2.4 +/- 0.4)x 10^(-3) m_pi^{-1}.

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