Scalar leptoquark pair production at the LHC: precision predictions in the era of flavour anomalies

Abstract

We comprehensively examine precision predictions for scalar leptoquark pair production at the LHC. In particular, we investigate the impact of lepton $t$-channel exchange diagrams that are potentially relevant in the context of leptoquark scenarios providing an explanation for the flavour anomalies. We also evaluate the corresponding total rates at the next-to-leading order in QCD. Moreover, we complement this calculation with the resummation of soft-gluon radiation at the next-to-next-to-leading logarithmic accuracy, hence providing the most precise predictions for leptoquark pair production at the LHC to date. Relying on a variety of benchmark scenarios favoured by the anomalies, our results exhibit an interesting interplay between the $t$-channel diagram contributions, the flavour texture satisfied by the leptoquark Yukawa couplings, the leptoquark masses and their representations under the Standard Model gauge group, as well as the chosen set of parton densities used for the numerical evaluations. The net effect on a cross section turns out to be very non-generic and ranges up to about 60% with respect to the usual next-to-leading-order predictions in QCD (i.e. without any $t$-channel contribution) for some scenarios considered. Dedicated calculations are thus required for any individual leptoquark model that could be considered in a collider analysis in order to assess the size of the studied corrections. In order to facilitate such calculations we provide dedicated public numerical packages.

arXiv comment33 pages, 7 figures, numerical codes available from https://www.uni-muenster.de/Physik.TP/research/kulesza/leptoquarks.html

References in corpus (79)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Automatized One-Loop Calculations in 4 and D dimensions
• Generating Feynman Diagrams and Amplitudes with FeynArts 3
• Parton distributions from high-precision collider data
• UFO - The Universal FeynRules Output
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• MadGraph/MadEvent v4: The New Web Generation
• The anomalous magnetic moment of the muon in the Standard Model
• R-parity violating supersymmetry
• Three-jet cross sections to next-to-leading order
• Evidence for an excess of B -> D(*) Tau Nu decays
• Collier: a fortran-based Complex One-Loop LIbrary in Extended Regularizations
• Automatic Generation of Tree Level Helicity Amplitudes
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
• Physics of leptoquarks in precision experiments and at particle colliders
• Reduction schemes for one-loop tensor integrals
• CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes
• Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs
• Automation of one-loop QCD corrections
• The Resummation of Soft Gluon in Hadronic Collisions
• NLL resummation of the heavy-quark hadroproduction cross-section
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• Soft-gluon resummation for squark and gluino hadroproduction
• Test of lepton universality in beauty-quark decays
• Automation of next-to-leading order computations in QCD: the FKS subtraction
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• Reduction of one-loop tensor 5-point integrals
• Measurement of the ratio of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ and $B^0\to D^{\ast -}{\mu }^{+}{\nu }_{\mu }$ branching fractions using three-prong $\tau$-lepton decays
• Evolution of Color Exchange in QCD Hard Scattering
• Sudakov Factorization and Resummation
• Closing the window on single leptoquark solutions to the $B$-physics anomalies
• Supersymmetric top and bottom squark production at hadron colliders
• Scalar one-loop 4-point integrals
• Automatic evaluation of UV and R2 terms for beyond the Standard Model Lagrangians: a proof-of-principle
• Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ with a semileptonic tagging method
• A comprehensive approach to new physics simulations
• Scalar leptoquarks from GUT to accommodate the $B$-physics anomalies
• Threshold Resummation for Dijet Cross Sections
• Pair production of scalar leptoquarks at the LHC
• Test of lepton-flavor universality in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays at Belle
• On the single leptoquark solutions to the $B$-physics anomalies
• Pair production of scalar leptoquarks at the Tevatron
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• Test of lepton flavor universality and search for lepton flavor violation in $B\to K\ell \ell$ decays
• Threshold resummation for pair production of coloured heavy (s)particles at hadron colliders
• NNLL resummation for squark and gluino production at the LHC
• Leptoquark toolbox for precision collider studies
• NNLL resummation for squark-antisquark pair production at the LHC
• Search for a scalar partner of the top quark in the all-hadronic $t\bar{t}$ plus missing transverse momentum final state at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
• Pair Production of Scalar Leptoquarks at the LHC to NLO Parton Shower Accuracy
• NNLL resummation for stop pair-production at the LHC
• Unified Framework for $B$-Anomalies, Muon $g-2$, and Neutrino Masses
• Precision predictions for scalar leptoquark pair-production at hadron colliders
• Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Correlating $h\to {\mu }^{+}{\mu }^{-}$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks
• Searches for third-generation scalar leptoquarks in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabibbo Angle
• Search for pair production of second-generation leptoquarks at $\sqrt{s}=$ 13 TeV
• Search for pair production of first-generation scalar leptoquarks at $\sqrt{s}=$ 13 TeV
• Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS experiment
• Search for new phenomena in final states with $b$-jets and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Search for a singly produced third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for pair production of scalar leptoquarks decaying into first- or second-generation leptons and top quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Explanations for anomalies of muon anomalous magnetic dipole moment, $b\to s\mu \bar{\mu }$ and radiative neutrino masses in a leptoquark model
• Scalar Leptoquarks, Baryon Number Violation and Pati-Salam Symmetry
• Light dark matter, rare $B$ decays with missing energy in $L_{\mu }-L_{\tau }$ model with a scalar leptoquark

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• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Comprehensive exploration of t-channel simplified models of dark matter
• On Drell-Yan production of scalar leptoquarks coupling to heavy-quark flavours
• Fresh look at the LHC limits on scalar leptoquarks
• Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD
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• A neutrino window to scalar leptoquarks: from low energy to colliders
• t-channel dark matter at the LHC -- a whitepaper
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