Renormalon Cancellation in Heavy Quarkonia and Determination of m_b, m_t

Abstract

This is an elementary introduction to the recent significant theoretical progress in the field of heavy quarkonium physics. We show how renormalon cancellation takes place in the heavy quarkonium system, such as bottomonium and (remnant of) toponium resonance, and how this notion is useful in extracting the MSbar masses of the bottom and top quarks.

Based on the invited talk given at the Japan Physics Society Meeting, Osaka, Japan, March 30 - April 2, 2000