6533b7d4fe1ef96bd12626be

RESEARCH PRODUCT

Gauge fields, hidden local symmetries, and meson exchange currents

subject

description

Abstract The model dependence of the electromagnetic isovector meson exchange current (MEC) operator at higher momentums transfer is studied. For this purpose, the MEC operator constructed from a Lagrangian of the πϱa 1 system obtained within the framework of the hidden local symmetries (HLS) approach is compared with the analogous operator derived earlier from a minimal Yang-Mills (YM) Lagrangian. Numerical results for the deuteron disintegration near threshold show that the model dependent part of the exchange current modifies the tail of the cross section sensibly and that the presence of the a 1 meson both in the MEC and in the nuclear interaction provides a consistent description of the cross sections up to the momentums transfer t ∼ 1.5 GeV 2 . It is also found that the standard π + ϱ MEC does not possess the correct chiral properties.