A Phenomenological Study of Bottom Quark Fragmentation in Top Quark Decay

Abstract

Top-quark physics is one of the main fields of investigation at the Tevatron accelerator and, ultimately, at the LHC. We perform a phenomenological analysis of ttbar events at hadron colliders, with a focus on observables relying on bottom-quark fragmentation in top-quark decay. In particular, we investigate the B-lepton invariant-mass distribution in the dilepton channel and give an estimate of the contribution of bottom fragmentation to the Monte Carlo uncertainty on the top-quark mass reconstruction.

18 pages, 11 figures, 5 tables. Figures 4,5,10,11, Tables 2-5, Eqs. (5)-(8) revised. Main results unchanged

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• Measurement of $b$-quark fragmentation properties in jets using the decay $B^{\pm }\to J/\psi K^{\pm }$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Top quark mass determination from the energy peaks of b-jets and B-hadrons at NLO QCD
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• Hadronization systematics and top mass reconstruction
• The Standard Model from the LHC to future colliders: a contribution to the Workshop "What Next" of INFN