Partons traversing the strongly interacting medium produced in heavy-ion
collisions are expected to lose energy depending on their color charge and
mass. We measure the nuclear modification factors for charm- and bottom-decay
electrons, defined as the ratio of yields, scaled by the number of binary
nucleon-nucleon collisions, in $sqrt{s_{
m NN}}$ = 200 GeV Au+Au collisions
to $p$+$p$ collisions ($R_{
m AA}$), or in central to peripheral Au+Au
collisions ($R_{
m CP}$). We find the bottom-decay electron $R_{
m AA}$ and
$R_{
m CP}$ to be significantly higher than that of charm-decay electrons.
Model calculations including mass-dependent parton energy loss in a strongly
coupled medium are consistent with the measured data. These observations
provide clear evidence of mass ordering of charm and bottom quark energy loss
when traversing through the strongly coupled medium created in heavy-ion
collisions.
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