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The dependence of jet shapes in $t\bar{t}$ events on the $b$-quark mass andthe strong coupling is investigated. To this end, the Pythia Monte Carlogenerator is used to produce samples of $t\bar{t}$ events in $pp$ collisions at$\sqrt{s} = 7 \ \mathrm{TeV}$, performing a scan over the values for the showerQCD scale $\Lambda_s$ and the $b$-quark mass $m_b$. The obtained jet shapes arecompared with recently published data from the ATLAS collaboration. From fitsto the light-jet data, the Monte Carlo shower scale is determined, while the$b$-quark mass is extracted using the $b$-jet shapes. The result for the massof the $b$-quark is $m_b = 4.86 ^{+0.49}_{-0.42}\ \mathrm{GeV}$.

Determination of the $b$-quark mass $m_b$ from the angular screening effects in the ATLAS $b$-jet shape data