SMEFT analysis of mW

Article Physics, Particles & Fields

The top quark electro-weak couplings after LHC Run 2

Víctor Miralles et al.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

Article Physics, Particles & Fields

Higgs probes of top quark contact interactions and their interplay with the Higgs self-coupling

Lina Alasfar et al.

Summary: We calculate the dominant contributions of third generation four-quark operators to single-Higgs production and decay and investigate their impact on the fitting results.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Particles & Fields

A new generation of simultaneous fits to LHC data using deep learning

Shayan Iranipour et al.

Summary: This study presents a new methodology that allows for the simultaneous determination of the Parton Distribution Functions (PDFs) of the proton and any parameters that determine theoretical predictions. The methodology is based on an extension of the NNPDF4.0 neural network architecture, which enables the determination of multiple parameters simultaneously. The study demonstrates the capabilities of this methodology by fitting PDFs with a subset of Wilson coefficients within the Standard Model Effective Field Theory framework, and shows its potential for extension to other precision parameters in the standard model.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Multidisciplinary Sciences

Low energy SUSY confronted with new measurements of W-boson mass and muon g-2

Jin-Min Yang et al.

Summary: The new measurements of the W-boson mass and muon g-2 show significant deviations from the standard model predictions, suggesting the presence of new physics. This study explores the implications of these measurements on low energy supersymmetry and finds that the minimal supersymmetric standard model can explain both measurements within the allowed parameter space, considering theoretical uncertainties. The favored parameter space is characterized by a compressed spectrum between bino, wino, and stau, with the stop around 1 TeV, which may be probed in future LHC searches.

SCIENCE BULLETIN (2022)

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Article Astronomy & Astrophysics

Unified explanation of the anomalies in semileptonic B decays and the W mass

Marcel Alguero et al.

Summary: The discrepancies between the measurements of rare (semi)leptonic B decays and the corresponding Standard Model predictions suggest the existence of new physics. This paper highlights the importance of the mixing between the SM Z boson and the heavy neutral gauge boson Z' in explaining the B data. It is found that a mixing of appropriate size can provide a unified explanation for the B anomalies and the tension in the W mass.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Flavorful electroweak precision observables in the Standard Model effective field theory

Sally Dawson et al.

Summary: Electroweak precision observables provide strict limits on physics beyond the Standard Model. We calculate the next-to-leading corrections induced by flavor nonuniversal four-fermion interactions and find that the extracted limits on effective field theory coefficients depend strongly on the flavor structure of the four-fermion operators.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields

Interdependence of the new MUON G-2 result and the W-boson mass

Emanuele Bagnaschi et al.

Summary: The electroweak sector of the Minimal Supersymmetric extension of the Standard Model can explain a variety of experimental results, including the discrepancy between the experimental result and the Standard Model prediction for the anomalous magnetic moment of the muon. By taking into account the new experimental result, the mass of the W boson in the MSSM can be predicted up to certain values. Future measurements at the ILC could help distinguish between different MSSM scenarios.

EUROPEAN PHYSICAL JOURNAL C (2022)

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Article Astronomy & Astrophysics

Electroweak legacy of the LHC run II

Eduardo da Silva Almeida et al.

Summary: This study presents a comprehensive analysis of the electroweak interactions using data from Higgs and electroweak diboson production at LHC runs 1 and 2, as well as electroweak precision data. The results demonstrate the impact of the data on the kinematic distributions for Higgs production at LHC, and show the potential of LHC to indirectly learn about specific forms of new physics.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields

Combined SMEFT interpretation of Higgs, diboson, and top quark data from the LHC

Jacob J. Ethier et al.

Summary: In this study, a global interpretation of Higgs, diboson, and top quark measurements at the LHC was presented within the framework of the Standard Model Effective Field Theory (SMEFT) at dimension six. By constraining 36 independent directions in the parameter space, and incorporating both linear and quadratic corrections, the study demonstrated the importance of including NLO QCD and O (Lambda(-4)) effects for accurately mapping the posterior distributions associated with the fitted Wilson coefficients. The results highlight the interplay and complementarity between top quark, Higgs, and diboson measurements, and pave the way for more global SMEFT interpretations extended to other high-p(T) processes and low-energy observables.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

Top, Higgs, diboson and electroweak fit to the Standard Model effective field theory

John Ellis et al.

Summary: The search for effective field theory deformations of the Standard Model is conducted through a global approach in the framework of the Standard Model Effective Field Theory. The analysis includes constraints on the coefficients of SMEFT operators and explores specific ultra-violet completions of the Standard Model, but does not find significant evidence for physics beyond the Standard Model.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

The singly-charged scalar singlet as the origin of neutrino masses

Tobias Felkl et al.

Summary: We investigate the generation of neutrino masses using a singly-charged scalar singlet and identify two distinct structures for the neutrino mass matrix under general assumptions. This leads to a constraint on the antisymmetric Yukawa coupling of the scalar singlet, excluding large hierarchies among the Yukawa couplings. Our study explores the implications for various aspects of lepton phenomenology and discusses the parameter space relevant to addressing the Cabibbo Angle Anomaly.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

SMEFT analysis of vector boson scattering and diboson data from the LHC Run II

Jacob J. Ethier et al.

Summary: In this study, a systematic interpretation of vector boson scattering (VBS) and diboson measurements from the LHC was presented within the framework of the dimension-six standard model effective field theory (SMEFT). The VBS measurements were found to provide complementary information on several relevant operators for the description of the electroweak sector compared to the diboson measurements. Additionally, the ultimate EFT reach of VBS measurements was quantified through dedicated projections for the high luminosity LHC, motivating the integration of VBS processes in future global SMEFT interpretations of particle physics data.

EUROPEAN PHYSICAL JOURNAL C (2021)

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Article Physics, Particles & Fields

Global fits of third family hypercharge models to neutral current B-anomalies and electroweak precision observables

B. C. Allanach et al.

Summary: The study examines global fits of several third family hypercharge models to a combination of electroweak data and data pertinent to the neutral current B-anomalies, finding that simple versions of the models provide much improved fits.

EUROPEAN PHYSICAL JOURNAL C (2021)

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Article Physics, Particles & Fields

Top and beauty synergies in SMEFT-fits at present and future colliders

Stefan Bissmann et al.

Summary: This study performs global fits within Standard Model Effective Field Theory (SMEFT) by combining top-quark pair production processes and decay, b -> s flavor changing neutral current transitions, and Z -> bb processes. The research is divided into three stages, with the latter stage focusing on the impact of a future lepton collider on directly probing l(+)l(-) -> tt transitions, resulting in qualitative improvements to global SMEFT fits.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

The flavor of UV physics

Sebastian Bruggisser et al.

Summary: The study focuses on the patterns of virtual effects of new physics above the TeV scale in observables at lower energies, and explores their implications on the flavor structure of a UV theory. By analyzing top-quark and B-physics observables within the framework of SMEFT, it is shown that the Minimal Flavor Violation framework is crucial in determining possible sources of flavor breaking in a UV theory.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Astronomy & Astrophysics

Obscure Higgs boson at colliders

Priyotosh Bandyopadhyay et al.

Summary: The study considers an extension of the Standard Model with a complex hypercharge zero triplet scalar, where one of the charged Higgs bosons remains purely triplet and suitable as a dark matter candidate. The pure triplet charged Higgs leads to displaced signatures and its sensitivity has been studied at LHC and MATHUSLA. The prospects of such exotic scalars at present and future hadron/muon colliders have been explored by calculating their production cross section and dominant decay modes.

PHYSICAL REVIEW D (2021)

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Article Physics, Particles & Fields