Taste-Changing in Staggered Quarks
  We present results from a systematic perturbative investigation of taste-changing in improved staggered quarks. We show one-loop taste-changing interactions can be removed perturbatively by an effective four-quark term and calculate the necessary coefficients. 
Quentin Mason, Peter Lepage, Paul Mackenzie, Howard Trottier, Joachim   Hein, Christine Davies and Eduardo Follana