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

Abstract

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 $pp\to e^{+}{\nu }_e{\mu }^{-}{\bar{\nu }}_{\mu }b\bar{b}b\bar{b}$ 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 $t\bar{t}H(H\to b\bar{b})$ 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.

32 pages, 13 Figures, 6 Tables, version to appear in JHEP

References in corpus (17)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• LHAPDF6: parton density access in the LHC precision era
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• A standard format for Les Houches Event Files
• OneLOop: for the evaluation of one-loop scalar functions
• Assault on the NLO Wishlist: pp -> tt bb
• Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
• NLO QCD corrections to pp -> t anti-t b anti-b + X at the LHC
• Polarizing the Dipoles
• NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
• FeynGame
• Off-shell Top Quarks with One Jet at the LHC: A comprehensive analysis at NLO QCD
• Matching the Nagy-Soper parton shower at next-to-leading order
• Kaleu: a general-purpose parton-level phase space generator
• The simplest of them all: $t\bar{t}{W}^{\pm }$ at NLO accuracy in QCD
• Hadroproduction of $t\bar{t}b\bar{b}$ final states at LHC: predictions at NLO accuracy matched with Parton Shower

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• Computational challenges for multi-loop collider phenomenology
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• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
• NLO QCD predictions for $\mathbf{t}\bar{\mathbf{t}}\mathbf{\gamma }$ with realistic photon isolation
• Measurement of $t\bar{t}$ production in association with additional $b$-jets in the $e\mu$ final state in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
• NLO QCD predictions for off-shell $t\bar{t}W$ production in association with a light jet at the LHC
• Inclusive and differential cross section measurements of $\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}$ production in the lepton+jets channel at $\sqrt{s}$ = 13 TeV
• Five-flavour scheme predictions for $t\bar{t}b\bar{b}$ at next-to-leading order accuracy
• Measurements of the Cross-Section for the $t\bar{t}$ + Heavy-Flavor Production at the LHC
• Hadroproduction of four top quarks in the POWHEG BOX
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• Complete NLO corrections to off-shell $\mathbf{t}\bar{\mathbf{t}}$ production in the $\mathbf{\ell }+\mathbf{j}$ decay channel
• $t\bar{t}jj$ -- NLO QCD corrections to top quark pair production and decays at the LHC