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

Abstract

The dependence of jet shapes in $t\bar{t}$ events on the $b$-quark mass and the strong coupling is investigated. To this end, the Pythia Monte Carlo generator 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 shower QCD scale ${\Lambda }_s$ and the $b$-quark mass $m_b$. The obtained jet shapes are compared with recently published data from the ATLAS collaboration. From fits to 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 mass of the $b$-quark is $m_b=4.86_{-0.42}^{+0.49}\mathrm{GeV}$.

16 pages, 10 figures. Version matching the published version

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• Herwig++ Physics and Manual
• Non-perturbative QCD Effects and the Top Mass at the Tevatron
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Cited by in corpus (6)

• Snowmass 2021 whitepaper: Proton structure at the precision frontier
• Soft logarithms in processes with heavy quarks
• A consistent resummation of mass and soft logarithms in processes with heavy flavours
• On heavy-flavour jets with Soft Drop
• Heavy Flavour Jet Substructure
• Jet substructure of light and heavy flavor jets at RHIC