$t\bar{t}b\bar{b}$ at the LHC: on the size of corrections and b-jet definitions

Bevilacqua, Giuseppe; Bi, Huan-Yu; Hartanto, Heribertus Bayu; Kraus, Manfred; Lupattelli, Michele; Worek, Malgorzata

doi:10.1007/jhep08(2021)008

Title: $$t\bar{t}b\bar{b}$$ at the LHC: on the size of corrections and b-jet definitions

Journal Article · 01 August 2021 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep08(2021)008 · OSTI ID:1851300

Bevilacqua, Giuseppe ^[1]; Bi, Huan-Yu ^[2]; Hartanto, Heribertus Bayu ^[3]; Kraus, Manfred ^[4]; Lupattelli, Michele ^[2]; Worek, Malgorzata ^[2]

Univ. of Debrecen (Hungary); Florida State Univ., Tallahassee, FL (United States)
RWTH Aachen Univ. (Germany)
Univ. of Cambridge (United Kingdom)
Florida State Univ., Tallahassee, FL (United States)

We report on the calculation of the next-to-leading order QCD corrections to the production of a $$t\bar t$$ pair in association with two heavy-flavour jets. We concentrate on the di-lepton $$t\bar t$$ decay channel at the LHC with $$\sqrt{s}$$ = 13 TeV. The computation is based on pp → $$e^+ν_eμ^-\bar{ν}_μb\bar{b}b\bar{b}$$ matrix elements and includes all resonant and non-resonant diagrams, interferences and off-shell effects of the top quark and the W gauge boson. As it is customary for such studies, results are presented in the form of inclusive and differential fiducial cross sections. We extensively investigate the dependence of our results upon variation of renormalisation and factorisation scales and parton distribution functions in the quest for an accurate estimate of the theoretical uncertainties. We additionally study the impact of the contributions induced by the bottom-quark parton density. Results presented here are particularly relevant for measurements of $$t\bar{t}H(H → b\bar{b})$$ and the determination of the Higgs coupling to the top quark. In addition, they might be used for precise measurements of the top-quark fiducial cross sections and to investigate top-quark decay modelling at the LHC.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: Bundesministerium für Bildung und Forschung (BMBF); European Research Council (ERC); German Research Foundation (DFG); National Research, development and Innovation Office in Hungary; Science and Technology Facilities Council (STFC); USDOE Office of Science (SC)

Grant/Contract Number:: SC0010102

OSTI ID:: 1851300

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2021; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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