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In this work we present a new approach to threshold resummation in processeswith heavy quarks. In particular we will focus on the differential decay rateof a color-singlet particle into a $b \bar b$ pair and we will show how toresum in a consistent way both the logarithms of the mass and the logarithms ofthe heavy flavor energy fraction. Within this framework, we match the twodifferent approaches existing in literature to threshold resummation, the maindifference of which is the way in which the mass is treated (5-flavor scheme vs4-flavor scheme).

Soft resummation in processes with heavy quark: bridging the gap from 4-flavor to 5-flavor scheme