Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD

Article Computer Science, Interdisciplinary Applications

Complete Lagrangian and set of Feynman rules for scalar leptoquarks

Andreas Crivellin et al.

Summary: This article presents the complete Lagrangian and Feynman rules for scalar Leptoquarks, considering different representations and interactions, providing a foundation for further research.

COMPUTER PHYSICS COMMUNICATIONS (2022)

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Article Physics, Particles & Fields

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the RD(*) anomalies

Genevieve Belanger et al.

Summary: The measured branching fractions of B-mesons into leptonic final states suggest lepton flavour universality violation. This study explores the possibility of introducing a scalar leptoquark S-1 to explain this anomaly and also serve as a mediator between the Standard Model and a dark sector. Various constraints from collider searches, direct detection experiments, and the dark matter relic abundance are considered. The results highlight the importance of understanding the decay of pairs of leptoquarks into different final states for identifying the underlying dynamics.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Particles & Fields

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

Christoph Borschensky et al.

Summary: This study comprehensively examines precision predictions for scalar leptoquark pair production at the LHC. The impact of lepton t-channel exchange diagrams and their relevance in explaining flavour anomalies is investigated. Total rates are evaluated at the next-to-leading order in QCD, complemented with the resummation of soft-gluon radiation at the next-to-next-to-leading logarithmic accuracy. The results provide the most precise predictions for leptoquark pair production to date.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Particles & Fields

Explaining the hints for lepton flavour universality violation with three S2 leptoquark generations

Andreas Crivellin et al.

Summary: Leptoquarks are promising candidates for explaining lepton flavor universality violation. A model with three generations of leptoquarks, each coupled exclusively to a single lepton flavor, can provide a combined explanation for various discrepancies between measurements and Standard Model predictions. The presence of a tauquark can generate a dimension-six operator and improve the fit to b -> sl(+)l(-) data.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Particles & Fields

A flavor-inspired radiative neutrino mass model

J. Julio et al.

Summary: In this work, a new two-loop neutrino mass model is proposed to resolve flavor anomalies through leptoquarks and provide rich phenomenology. A detailed numerical analysis is performed to study neutrino and charged lepton flavor violation phenomenology, with constraints on Yukawa couplings and leptoquark masses. Bounds on the model's parameter space are scrutinized with exemplified benchmark scenarios.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Astronomy & Astrophysics

Marriage between neutrino mass and flavor anomalies

J. Julio et al.

Summary: This article proposes a unified framework to address flavor anomalies in beauty-quark decay and explain the origin of neutrino mass. The model generates neutrino mass through loops while satisfying constraints from collider searches and flavor physics.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields

The path to proton structure at 1% accuracy NNPDF Collaboration

Richard D. Ball et al.

Summary: We present NNPDF4.0, a new set of parton distribution functions (PDFs) based on a global dataset and machine learning techniques. The methodology includes the expansion of the dataset, optimization of hyperparameters, and the implementation of theoretical improvements. The results have been validated through closure tests and analyzed for their dependence on input choices. The implications of NNPDF4.0 on LHC processes have also been studied.

EUROPEAN PHYSICAL JOURNAL C (2022)

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Article Astronomy & Astrophysics

Light dark matter, rare B decays with missing energy in Lμ - Lτ model with a scalar leptoquark

Shivaramakrishna Singirala et al.

Summary: We investigate the phenomenology of light GeV-scale fermionic dark matter in the U(1)(L mu-Lt) gauge extension of the Standard Model. We address the flavor anomalies and light neutrino mass by adding heavy neutral fermions and an inert scalar doublet respectively, and employ a light gauge boson associated with the U(1)(L mu-Lt) gauge group to mediate the interaction between dark and visible sectors and achieve the correct relic density.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields

Collider signatures of coannihilating dark matter in light of the B-physics anomalies

Michael J. Baker et al.

Summary: Studied a dark sector with Majorana dark matter and coloured coannihilation partner connected to the Standard Model via a U-1 vector leptoquark; TeV scale U-1 leptoquark is the only successful single-mediator description of B-physics anomalies, showing resonant signatures and excluded by searches at LHC.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

S. Bailey et al.

Summary: The new MSHT20 set of parton distribution functions (PDFs) of the proton, determined from global analyses of hard scattering data, includes updates such as improved parameterizations, new precise data, and NNLO QCD corrections. The NNLO fit is strongly favored over the NLO due to wider range and increased precision of data included in the fit, resulting in reduced uncertainties in predictions for processes such as Higgs, top quark pair, and W, Z production at post LHC Run-II energies.

EUROPEAN PHYSICAL JOURNAL C (2021)

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Article Physics, Particles & Fields

Lepton-quark fusion at Hadron colliders, precisely

Admir Greljo et al.

Summary: This study presents the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the LHC, with NLO QCD and QED corrections showing similar size but opposite signs. The NLO K-factors for a wide range of scalar leptoquark masses, flavors, and charges are calculated, while theoretical uncertainties due to scale variations and limited knowledge of parton distribution functions are quantified. The study also discusses the disentanglement of leptoquark flavor interactions through the interplay between different production channels.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Multidisciplinary

Muon g-2 and B Anomalies from Dark Matter

Giorgio Arcadi et al.

Summary: In light of recent experimental results, a set of models with minimal field content were studied for the first time, addressing dark matter, B anomalies, and the muon g-2 discrepancy. These models, utilizing heavy particles and chiral enhancement, can evade current direct search limits and be tested at present and future colliders.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Minimal Explanation of Flavor Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabibbo Angle

David Marzocca et al.

Summary: Significant deviations from the standard model are observed in semileptonic charged and neutral-current B decays, the muon magnetic moment, and the extraction of the Cabibbo angle, pointing towards a coherent pattern of new physics effects induced by two scalar mediators. This framework provides the most minimal explanation to the mentioned anomalies while being consistent with all other phenomenological constraints.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Correlating h → μ+ μ- to the Anomalous Magnetic Moment of the Muon via Leptoquarks

Andreas Crivellin et al.

Summary: Recent measurements by ATLAS and CMS have provided evidence of the standard model Higgs boson decaying into two oppositely charged muons, indicating coupling to second generation fermions. The findings challenge explanations for lepton flavor universality violation and offer opportunities to explore new physics. Additionally, investigations into leptoquark models reveal enhanced effects in the h -> mu(+)mu(-) decay mode while addressing a(mu) explanations.

PHYSICAL REVIEW LETTERS (2021)

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Article Astronomy & Astrophysics

Single leptoquark solutions to the B-physics anomalies

Andrei Angelescu et al.

Summary: Through the introduction of a single leptoquark state and combination with the most recent low energy flavor physics constraints, we find that only the vector leptoquark U1 can provide a viable solution to explain B-anomalies and interestingly predicts a lower bound for lepton flavor violating b -> s mu(+/-)tau(+/-) decay modes.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Explanations for anomalies of muon anomalous magnetic dipole moment, b → sμμ, and radiative neutrino masses in a leptoquark model

Takaaki Nomura et al.

Summary: The study proposes a leptoquark model to explain anomalies of muon anomalous magnetic dipole moment and b -> s mu mu, satisfying stringent constraints such as mu -> e gamma and meson mixings. Additionally, it is found that these leptoquarks can generate tiny neutrino masses at one-loop level without introducing any additional symmetries. Numerical analysis is conducted to show restrictions on the parameter space.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Leptoquarks and matter unification: Flavor anomalies and the muon g-2

Pavel Fileviez Perez et al.

Summary: This paper discusses the minimal theory for quark-lepton unification at the low scale, where quarks and leptons are unified in the same representations and neutrino masses are generated through the inverse seesaw mechanism. It also delves into the properties of leptoquarks predicted in this theory, and investigates the predictions for the leptonic and semileptonic decays of mesons, as well as the possibility of explaining the current values of R-K and the muon anomalous magnetic moment.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Scalar leptoquarks, baryon number violation, and Pati-Salam symmetry

Clara Murgui et al.

Summary: This paper discusses the impact of scalar leptoquarks with masses around a few TeV on baryon number violation in a Pati-Salam model, showing that the Pati-Salam embedding can suppress baryon number violation in some cases. This work extends previous results on the same issue for vector leptoquarks by Assad, Grinstein, and Fornal.

PHYSICAL REVIEW D (2021)

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Article Physics, Particles & Fields

New physics effects in leptonic and semileptonic decays

Damir Becirevic et al.

Summary: This study discusses extracting constraints on New Physics using current data on leptonic and semileptonic decays of pseudoscalar mesons. By combining experimental information with precise lattice QCD results, constraints on New Physics couplings are obtained. New observables from angular analysis of semileptonic decays are proposed and values in the Standard Model and beyond are discussed.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

Novel leptoquark pair production at LHC

Ilja Dorsner et al.

Summary: This novel mechanism introduces a way for leptoquark pair production at LHC, providing an alternative approach to constrain the parameter space of leptoquark scenarios efficiently under specific conditions.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Astronomy & Astrophysics

New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC

Tie-Jiun Hou et al.

Summary: The new parton distribution functions (PDFs) from the CTEQ-TEA collaboration are determined using a wide variety of high-precision Large Hadron Collider (LHC) data, in addition to other datasets. These PDFs are analyzed at next-to-leading order and next-to-next-to-leading order, with error sets determined using the Hessian method. The data sensitivity and preference towards quantities such as α(s)(m(Z)), and the gluon and strange quark distributions are quantified using fast PDF survey techniques.

PHYSICAL REVIEW D (2021)

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Article Physics, Particles & Fields

Non-standard interactions in radiative neutrino mass models

K. S. Babu et al.

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Article Physics, Particles & Fields

Flavor phenomenology of the leptoquark singlet-triplet model

Andreas Crivellin et al.

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Review Physics, Multidisciplinary

The anomalous magnetic moment of the muon in the Standard Model

T. Aoyama et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2020)

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The dark side of 4321

Diego Guadagnoli et al.

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Article Physics, Multidisciplinary

Lepton-Quark Collisions at the Large Hadron Collider

Luca Buonocore et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Physics, Particles & Fields

Charm physics confronts high-pT lepton tails

Javier Fuentes-Martin et al.

JOURNAL OF HIGH ENERGY PHYSICS (2020)

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Article Astronomy & Astrophysics

Scalar leptoquark pair production at hadron colliders

Christoph Borschensky et al.

PHYSICAL REVIEW D (2020)

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Article Physics, Particles & Fields

The leptoquark Hunter's guide: large coupling

Martin Schmaltz et al.

JOURNAL OF HIGH ENERGY PHYSICS (2019)

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Article Physics, Particles & Fields

A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses

Innes Bigaran et al.

JOURNAL OF HIGH ENERGY PHYSICS (2019)

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Article Physics, Particles & Fields

Leptoquark toolbox for precision collider studies

Ilja Dorsner et al.

JOURNAL OF HIGH ENERGY PHYSICS (2018)

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Article Physics, Particles & Fields

Lepto-quark portal dark matter

Soo-Min Choi et al.

JOURNAL OF HIGH ENERGY PHYSICS (2018)

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Scalar leptoquarks from grand unified theories to accommodate the B-physics anomalies

Damir Becirevic et al.

PHYSICAL REVIEW D (2018)

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Article Astronomy & Astrophysics

Hunting leptoquarks in monolepton searches

Saurabh Bansal et al.

PHYSICAL REVIEW D (2018)

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Flavorful leptoquarks at hadron colliders

Gudrun Hiller et al.

PHYSICAL REVIEW D (2018)

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High-pT dilepton tails and flavor physics

Admir Greljo et al.

EUROPEAN PHYSICAL JOURNAL C (2017)

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Article Astronomy & Astrophysics

Confronting lepton flavor universality violation in B decays with high-pT tau lepton searches at LHC

Darius A. Faroughy et al.

PHYSICS LETTERS B (2017)

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Article Physics, Particles & Fields

Simultaneous explanation of R(D(*)) and b → sμ+μ-: the last scalar leptoquarks standing

Andreas Crivellin et al.

JOURNAL OF HIGH ENERGY PHYSICS (2017)

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Article Astronomy & Astrophysics

(g-2)μ, lepton flavor violation, and Z decays with leptoquarks: Correlations and future prospects

Estefania Coluccio Leskow et al.

PHYSICAL REVIEW D (2017)

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Anticipating nonresonant new physics in dilepton angular spectra at the LHC

Nirmal Raj

PHYSICAL REVIEW D (2017)

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Review Physics, Multidisciplinary

Physics of of leptoquarks in precision experiments and at particle colliders

I. Dorsner et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2016)

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Article Astronomy & Astrophysics

Pair production of scalar leptoquarks at the LHC to NLO parton shower accuracy

Tanumoy Mandal et al.

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LHAPDF6: parton density access in the LHC precision era

Andy Buckley et al.

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NLO leptoquark production and decay: the narrow-width approximation and beyond

J. B. Hammett et al.

JOURNAL OF HIGH ENERGY PHYSICS (2015)

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Single productions of colored particles at the LHC: an example with scalar leptoquarks

Tanumoy Mandal et al.

JOURNAL OF HIGH ENERGY PHYSICS (2015)

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RK and future b → sll physics beyond the standard model opportunities

Gudrun Hiller et al.

PHYSICAL REVIEW D (2014)

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Cornering scalar leptoquarks at LHC

Ilja Dorsner et al.

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

J. Alwall et al.

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UFO - The Universal FEYNRULES Output

Celine Degrande et al.

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Two-loop neutrino mass generation through leptoquarks

K. S. Babu et al.

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A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX

Simone Alioli et al.

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R-parity-violating supersymmetry

R Barbier et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2005)

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Unification without supersymmetry:: Neutrino mass, proton decay and light leptoquarks

I Dorsner et al.

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Pair production of scalar leptoquarks at the CERN LHC -: art. no. 057503

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A new method for combining NLO QCD with shower Monte Carlo algorithms

P Nason

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Stop-lepton associated production at hadron colliders

A Alves et al.

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Generating Feynman diagrams and amplitudes with FeynArts 3

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Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD

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