  One of the main results of this paper is a proof of the rank one case of an
existence conjecture on lisse l-adic sheaves on a smooth variety over a finite
field due to Deligne and Drinfeld. The problem is translated into the language
of higher dimensional class field theory over finite fields, which describes
the abelian fundamental group by Chow groups of zero cycles with moduli. A key
ingredient is the construction of a cycle theoretic avatar of refined Artin
conductor in ramification theory originally studied by Kazuya Kato.
