SU(2)D lepton portals for the muon g-2, W-boson mass, and dark matter

Article Multidisciplinary Sciences

High-precision measurement of the W boson mass with the CDF II detector

T. Aaltonen et al.

Summary: This study measured the mass of the W boson and compared it with the expectation of the standard model of particle physics. The results show a significant discrepancy between the measured value and the expectation.

SCIENCE (2022)

Add to Collection

Article Physics, Particles & Fields

Models for self-resonant dark matter

Seong-Sik Kim et al.

Summary: We propose a new mechanism to enhance the self-scattering and annihilation cross sections for dark matter with multiple components but without a light mediator. This mechanism utilizes the lighter dark matter component as a u-channel pole in the elastic co-scattering for dark matter, resulting in a large self-scattering cross section and a Sommerfeld enhancement for semi-annihilation processes. We study various combinations of multiple dark matter components with spins and parities, presenting a u-channel pole in the co-scattering processes.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

Add to Collection

Article Astronomy & Astrophysics

Non-Abelian vector dark matter and lepton g-2

Talal Ahmed Chowdhury et al.

Summary: Expanding the Standard Model with a non-Abelian gauge symmetry can explain the muon anomalous magnetic moment and reproduce the correct relic abundance, but concurrently describing the electron anomalous magnetic moment in this setup is challenging.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Physics, Multidisciplinary

Seesaw lepton masses and muon g-2 from heavy vector-like leptons

Hyun Min Lee et al.

Summary: We propose a model using a vector-like lepton to explain the small muon mass, based on lepton-specific two Higgs doublet models with a local U(1)' symmetry. The physical muon mass is generated through mixing between the vector-like lepton and the muon after the leptophilic Higgs doublet and the dark Higgs get VEVs. Constraints on the model are discussed including lepton flavor violation, electroweak precision, Higgs data, and collider searches, with non-decoupling effects of the vector-like lepton leading to contributions to the muon g - 2.

JOURNAL OF THE KOREAN PHYSICAL SOCIETY (2021)

Add to Collection

Article Astronomy & Astrophysics

Constraints on the two-pion contribution to hadronic vacuum polarization

Gilberto Colangelo et al.

Summary: This study explores the potential modification of the two-pion contribution to the anomalous magnetic moment of the muon without conflicting with low-energy hadron phenomenology elsewhere. By considering the dispersive representation of the e(+) e(-) -> 2 pi process, correlations are revealed between various physical quantities, showing that changes in the phase shift and inelastic contribution could substantially alter a(mu)(HVP). This demonstrates the importance of inelastic effects and suggests possible scenarios where a uniform shift around 4% is required to minimize the effect on the cross section.

PHYSICS LETTERS B (2021)

Add to Collection

Article Multidisciplinary Sciences

Leading hadronic contribution to the muon magnetic moment from lattice QCD

Sz. Borsanyi et al.

Summary: The standard model of particle physics describes the majority of experiments and observations involving elementary particles, with a long-standing discrepancy concerning the anomalous magnetic moment of the muon. Ongoing experiments aim to reduce measurement errors, theoretically attributed to the leading-order hadronic vacuum polarization contribution, to distinguish between experimental measurements and predictions. The developed methods using ab initio quantum chromodynamics and quantum electrodynamics simulations favor experimentally measured values over those obtained using dispersion methods, with potential for increased precision as computer technology advances.

NATURE (2021)

Add to Collection

Article Physics, Multidisciplinary

Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm

B. Abi et al.

Summary: The experiment presented the first results of the Fermilab National Accelerator Laboratory (FNAL) Muon g - 2 Experiment for the positive muon magnetic anomaly a(mu) (g(mu) - 2)/2, which determined the anomaly from precision measurements of two angular frequencies. The result showed a deviation of 3.3 standard deviations from the standard model prediction, in agreement with previous measurements, increasing the tension between experiment and theory.

PHYSICAL REVIEW LETTERS (2021)

Add to Collection

Correction Astronomy & Astrophysics

Planck 2018 results: VI. Cosmological parameters (vol 641, A6, 2020)

N. Aghanim et al.

ASTRONOMY & ASTROPHYSICS (2021)

Add to Collection

Article Physics, Particles & Fields

Flux-mediated dark matter

Yoo-Jin Kang et al.

Summary: We propose a new mechanism for communication between fermion dark matter and the Standard Model through four-form flux, leading to unsuppressed annihilations of dark matter into a pair of singlet-like scalars with similar mass as for dark matter.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics