  This report represents the response of the Intensity Frontier Quark Flavor
Physics Working Group to the Snowmass charge. We summarize the current status
of quark flavor physics and identify many exciting future opportunities for
studying the properties of strange, charm, and bottom quarks. The ability of
these studies to reveal the effects of new physics at high mass scales make
them an essential ingredient in a well-balanced experimental particle physics
program.

High Energy Physics - Experiment;High Energy Physics - Lattice;High Energy Physics - Phenomenology