Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-05-21
Physics
Nuclear Physics
Nuclear Theory
21 pages LaTeX2e with 4 figures, using includegraphicx (4 .eps figure). Version accepted for publication in Int. J. Mod. Phys.
Scientific paper
The S wave pion deuteron scattering length is presented at NLO in the Effective Field Theory formulation of the two nucleon system with perturbative pions. At this order, this observable is determined by the iso-scalar S wave pion nucleon scattering length a^+, by pion re-scattering contributions inside the deuteron and by two nucleon two pion contact interactions that involve two unknown parameters which renormalise the appearing divergences. By choosing their values accordingly and in agreement with their natural sizes predicted by the power counting, we are able to accommodate the available experimental data. However, a^+ cannot be determined from pion deuteron scattering directly. An ongoing experiment at PSI aiming to reduce the error bars by an order of magnitude will make it possible to pin down the size of these counter terms more accurately. We compare our findings to an approach in which pions are treated non-perturbatively.
Borasoy Bugra
Griesshammer Harald W.
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