Production of Heavy Flavor in ATLAS

The ATLAS experiment at the Large Hadron collider measures various heavy flavor production processes. This paper focuses on the measurement of $W$ boson production in association with a charmed hadron in $pp$ collisions at 13 TeV as well as on the production of $\Upsilon(nS)$ mesons in $Pb + Pb$ and $pp$ collisions at 5.02 TeV. Both of these analyses are important for the understanding of the heavy flavor properties under various conditions.