The nuclear physics relevant to the electric dipole moment (EDM) of the deuteron is addressed. The general operator structure of the P-and T-odd nucleon-nucleon interaction is discussed and applied to the two-body contributions of the deuteron EDM, which can be calculated in terms of P-and T-odd meson-nucleon coupling constants with only small model dependence. The one-body contributions, the EDMs of the proton and the neutron, are evaluated within the same framework. Although the total theoretical uncertainties are sizable, we conclude that, compared to the neutron, the deuteron EDM is competitive in terms of sensitivity to CP violation, and complementary with respect to the microscopic sources of CP violation that can be probed. DOI: 10.1103/PhysRevC.70.055501 PACS number(s): 24.80.ϩy, 21.10.Ky, 11.30.Er II. P-AND T-ODD TWO-NUCLEON INTERACTIONBy contracting two Dirac bilinear covariants containing at most one derivative, the P-odd, T-odd, and C-even (hence still CPT-even) contact NN interaction can be constructed from (i) the scalar-pseudoscalar (S-PS) combination, N N ϫ N i␥ 5 N, and (ii) the vector-pseudovector (V-PV) combination, N ␥ N ϫ N ‫ץ‬ J ␥ 5 N [14]. The tensor-pseudotensor (T-PT) combination, N N ϫ N ␥ 5 N, also qualifies these symmetry considerations, however, it is equivalent to the S-PS one by a Fierz transformation. *Electronic address: liu@KVI.nl † Electronic address: timmermans@KVI.nl PHYSICAL REVIEW C 70, 055501 (2004)

The molecular structure of a mouse immunoglobulin D from a plasmacytoma tumor and that of the normal mouse gene coding for immunoglobulin D are presented. The DNA sequence results indicate an unusual structure for the tumor delta chain in two respects: (i) Only two constant (C) region domains, termed C delta 1 and C delta 3 by homology considerations, are found; the two domains are separated by an unusual hinge region C delta H that lacks cysteine residues and thus cannot provide the covalent cross-links between heavy chains typically seen in immunoglobulins. The two domains and hinge are all coded on separate exons. (ii) At the carboxyl end of the delta chain there is a stretch of 26 amino acids that is coded from an exon located 2750 to 4600 base pairs downstream from the rest of the gene. Analogy with immunoglobulin M suggests that this distally coded segment C delta DC may have a membrane-binding function; however, it is only moderately hydrophobic. A fifth potential exon (C delta AC), located adjacent to the 3' (carboxyl) end of C delta 3, could code for a stretch of 49 amino acids. The tumor's expression of the delta gene may be aberrant, but the simplest interpretation would be that this tumor expresses one of the several biologically significant forms of the delta chain.

A single DNA fragment containing both mu and delta immunoglobulin heavy chain genes has been cloned from normal BALB/c mouse liver DNA with a new lambda phage vector Charon 28. The physical distance between the membrane terminal exon of mu and the first domain of delta is 2466 base pairs, with delta on the 3' side of mu. A single transcript could contain a variable region and both mu and delta constant regions. The dual expression of immunoglobulins M and D on spleen B cells may be due to alternate splicing of this transcript.

The parity-nonconserving asymmetry in the deuteron photodisintegration, ␥ ជ + d → n + p, is considered with the photon energy ranged up to 10 MeV above the threshold. The aim is to improve upon a schematic estimate assuming the absence of tensor, as well as spin-orbit forces in the nucleon-nucleon interaction. The major contributions are due to the vector-meson exchanges, and the strong suppression of the pion-exchange contribution is confirmed. A simple argument, going beyond the observation of an algebraic cancellation, is presented. Contributions of meson-exchange currents are also considered, but found to be less significant.