$t\bar{t}b\bar{b}$ 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

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 → $$e^+ν_eμ^-\bar{ν}_μb\bar{b}b\bar{b}$$ 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.

Authors:

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

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

Publication Date:: Mon Aug 02 00:00:00 EDT 2021

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

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

OSTI Identifier:: 1851300

Grant/Contract Number:: SC0010102; 396021762-TRR 257; 400140256-GRK 2497; K 125105; 683211; ST/T000694/1

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2021; Journal Issue: 8; Journal ID: ISSN 1029-8479

Publisher:: Springer Nature

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; NLO computations; QCD phenomenology

Citation Formats


                    Bevilacqua, Giuseppe, Bi, Huan-Yu, Hartanto, Heribertus Bayu, Kraus, Manfred, Lupattelli, Michele, and Worek, Malgorzata. $t\bar{t}b\bar{b}$ at the LHC: on the size of corrections and b-jet definitions.  United States: N. p., 2021. 
Web.  doi:10.1007/jhep08(2021)008.

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                    Bevilacqua, Giuseppe, Bi, Huan-Yu, Hartanto, Heribertus Bayu, Kraus, Manfred, Lupattelli, Michele, & Worek, Malgorzata. $t\bar{t}b\bar{b}$ at the LHC: on the size of corrections and b-jet definitions.  United States.  https://doi.org/10.1007/jhep08(2021)008

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                    Bevilacqua, Giuseppe, Bi, Huan-Yu, Hartanto, Heribertus Bayu, Kraus, Manfred, Lupattelli, Michele, and Worek, Malgorzata. Mon .  
"$t\bar{t}b\bar{b}$ at the LHC: on the size of corrections and b-jet definitions".  United States.  https://doi.org/10.1007/jhep08(2021)008.  https://www.osti.gov/servlets/purl/1851300.

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@article{osti_1851300,

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

  author       = {Bevilacqua, Giuseppe and Bi, Huan-Yu and Hartanto, Heribertus Bayu and Kraus, Manfred and Lupattelli, Michele and Worek, Malgorzata},

  abstractNote = {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.},

  doi          = {10.1007/jhep08(2021)008},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 8,

  volume       = 2021,

  place        = {United States},

  year         = {Mon Aug 02 00:00:00 EDT 2021},

  month        = {Mon Aug 02 00:00:00 EDT 2021}

}

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

Abstract

Citation Formats

Helac-Nlo journal, March 2013

The anti- k t jet clustering algorithm journal, April 2008

New parton distribution functions from a global analysis of quantum chromodynamics journal, February 2016

Next-To-Leading Order QCD Corrections to p p → t t ¯ b b ¯ + X at the LHC journal, July 2009

Automatic Feynman Graph Generation journal, April 1993

LHAPDF6: parton density access in the LHC precision era journal, March 2015

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NGluon: A package to calculate one-loop multi-gluon amplitudes journal, August 2011

FeynGame journal, November 2020

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ROOT — A C++ framework for petabyte data storage, statistical analysis and visualization journal, December 2009

OneLOop: For the evaluation of one-loop scalar functions journal, November 2011

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A standard format for Les Houches Event Files journal, February 2007

On the next-to-leading order QCD $ \mathcal{K} $ -factor for $ t\overline t b\overline b $ production at the TeVatron journal, February 2012

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Parton distributions from high-precision collider data: NNPDF Collaboration journal, October 2017

New NLOPS predictions for $$\varvec{t \bar{t} +b}$$ t t ¯ + b -jet production at the LHC journal, June 2018

Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order journal, February 2011

Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD journal, October 2013

Parton distributions in the LHC era: MMHT 2014 PDFs journal, May 2015

Next-to-leading order calculation of three-jet observables in hadron-hadron collisions journal, November 2003

Automated one-loop calculations: a proof of concept journal, September 2009

Hadroproduction of t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ final states at LHC: predictions at NLO accuracy matched with parton shower journal, March 2015

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NLO QCD corrections to $$ {\text{t}}\overline {\text{t}} {\text{b}}\overline {\text{b}} $$ production at the LHC: 2. Full hadronic results journal, March 2010

PDF4LHC recommendations for LHC Run II journal, January 2016

On the ratio of t t ¯ b b ¯ $$ t\overline{t} b\overline{b} $$ and t t ¯ jj $$ t\overline{t} jj $$ cross sections at the CERN Large Hadron Collider journal, July 2014

New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC journal, January 2021

NLO PDFs from the ABMP16 fit journal, June 2018

Assault on the NLO wishlist: pp → t t̄ b b̄ journal, September 2009

Jet Charge at the LHC journal, May 2013

Fat Jets for a Light Higgs Boson journal, March 2010

NLO QCD corrections to tt-barbb-bar production at the LHC: 1. quark-antiquark annihilation journal, August 2008

Off-shell top quarks with one jet at the LHC: a comprehensive analysis at NLO QCD journal, November 2016

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CutTools : a program implementing the OPP reduction method to compute one-loop amplitudes journal, March 2008

Next-to-leading order calculation of four-jet observables in electron-positron annihilation journal, December 1998

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Polarizing the dipoles journal, August 2009

The simplest of them all: $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD journal, August 2020

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Helac-Nlo
journal, March 2013

The anti- k _t jet clustering algorithm
journal, April 2008

New parton distribution functions from a global analysis of quantum chromodynamics
journal, February 2016

Next-To-Leading Order QCD Corrections to $p p \to t \bar{t} b \bar{b} + X$ at the LHC
journal, July 2009

Automatic Feynman Graph Generation
journal, April 1993

LHAPDF6: parton density access in the LHC precision era
journal, March 2015

Techniques for the treatment of IR divergences in decay processes at NLO and application to the top-quark decay
journal, January 2016

NGluon: A package to calculate one-loop multi-gluon amplitudes
journal, August 2011

FeynGame
journal, November 2020

Hadroproduction of t anti-t pair with a b anti-b pair using PowHel
journal, April 2014

ROOT — A C++ framework for petabyte data storage, statistical analysis and visualization
journal, December 2009

OneLOop: For the evaluation of one-loop scalar functions
journal, November 2011

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
journal, July 2014

A standard format for Les Houches Event Files
journal, February 2007

On the next-to-leading order QCD $ \mathcal{K} $ -factor for $ t\overline t b\overline b $ production at the TeVatron
journal, February 2012

Predictions for all processes e+e− → fermions + γ
journal, November 1999

Infrared-safe definition of jet flavour
journal, May 2006

Parton distributions from high-precision collider data: NNPDF Collaboration
journal, October 2017

New NLOPS predictions for $$\varvec{t \bar{t} +b}$$ t t ¯ + b -jet production at the LHC
journal, June 2018

Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
journal, February 2011

Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD
journal, October 2013

Parton distributions in the LHC era: MMHT 2014 PDFs
journal, May 2015

Next-to-leading order calculation of three-jet observables in hadron-hadron collisions
journal, November 2003

Automated one-loop calculations: a proof of concept
journal, September 2009

Hadroproduction of t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ final states at LHC: predictions at NLO accuracy matched with parton shower
journal, March 2015

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journal, December 2019

Precise Higgs-background predictions: merging NLO QCD and squared quark-loop corrections to four-lepton + 0,1 jet production
journal, January 2014

Ntuples for NLO events at hadron colliders
journal, May 2014

Electroweak corrections to charged-current fermion processes: Technical details and further results
journal, September 2005

NLO QCD corrections to $$ {\text{t}}\overline {\text{t}} {\text{b}}\overline {\text{b}} $$ production at the LHC: 2. Full hadronic results
journal, March 2010

PDF4LHC recommendations for LHC Run II
journal, January 2016

On the ratio of t t ¯ b b ¯ $$ t\overline{t} b\overline{b} $$ and t t ¯ jj $$ t\overline{t} jj $$ cross sections at the CERN Large Hadron Collider
journal, July 2014

New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
journal, January 2021

NLO PDFs from the ABMP16 fit
journal, June 2018

Assault on the NLO wishlist: pp → t t̄ b b̄
journal, September 2009

Jet Charge at the LHC
journal, May 2013

Fat Jets for a Light Higgs Boson
journal, March 2010

NLO QCD corrections to tt-barbb-bar production at the LHC: 1. quark-antiquark annihilation
journal, August 2008

Off-shell top quarks with one jet at the LHC: a comprehensive analysis at NLO QCD
journal, November 2016

NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
journal, October 2012

Reducing full one-loop amplitudes to scalar integrals at the integrand level
journal, February 2007

Matching the Nagy-Soper parton shower at next-to-leading order
journal, June 2015

`CutTools` : a program implementing the `OPP` reduction method to compute one-loop amplitudes
journal, March 2008

Next-to-leading order calculation of four-jet observables in electron-positron annihilation
journal, December 1998

QCD-aware partonic jet clustering for truth-jet flavour labelling
journal, February 2016

Polarizing the dipoles
journal, August 2009

The simplest of them all: $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD
journal, August 2020

QCD corrections to semileptonic decays of heavy quarks
journal, February 1989