Deuteron matrix elements in chiral effective theory at leading order

Artikel i vetenskaplig tidskrift, 2006

We consider matrix elements of two-nucleon operators that arise in chiral effective theories of the two-nucleon system. Generically, the short-distance piece of these operators scales as 1/r(n), with r the relative separation of the two nucleons. We show that, when evaluated between the leading-order wave functions obtained in this effective theory, these two-nucleon operators are independent of the cutoff used to renormalize the two-body problem for n=1 and 2. However, for n >= 3 general arguments about the short-distance behavior of the leading-order deuteron wave function show that the matrix element will diverge. (c) 2006 Elsevier B.V. All rights reserved.