Search

A new CDF II measurement of the W -boson mass indicated a 7 σ deviation from the Standard Model (SM) prediction, and the previous FNAL and BNL measurement of muon (g -2) showed a 4.2 σ deviation from the SM prediction. As a result, new physics beyond the SM is indicated. In this paper, parameter space is scanned in the μ -term extended Next-to-Minimal Supersymmetric Standard Model (μ NMSSM). We get the surviving samples considering the limitations from the Large Hadron Collider (LHC) experiment and the Dark Matter (DM) direct detection experiment. In addition, we study phenomenon of W -boson mass and muon magnetic moment for them. Finally, we find that it is difficult to obtain samples surviving constraints of both CDF II experiment and muon anomaly magnetic in the μ NMSSM. [ABSTRACT FROM AUTHOR]

The W-boson mass (mw = (80.4335 ± 0.0094) GeV) measured by the Collider Detector at Fermilab Collaboration is greater than the standard model (SM) prediction at a confidence level of 7σ, strongly suggesting the presence of new particles or fields. In the literature, various new particles and/or fields have been introduced to explain the astrophysical and experimental data, and their presence, in principle, may also enhance the W-boson mass. In this study, we investigate axion-like particle (ALP), dark photon (DP), and chameleon dark energy (DE) models for a solution to the W-boson mass excess. We find that the ALP and DP interpretations have been significantly narrowed down by global electroweak fits. The possibility of attributing the W-boson mass anomaly to the chameleon DE is ruled out by other experiments. [ABSTRACT FROM AUTHOR]

[Display omitted] The new CDF II measurement of W -boson mass shows a 7 σ deviation from the standard model (SM) prediction, while the recent FNAL measurement of the muon g - 2 shows a 4.2 σ deviation (combined with the BNL result) from the SM. Both of them strongly indicate new physics beyond the SM. In this work, we study the implication of both measurements on low energy supersymmetry. With an extensive exploration of the parameter space of the minimal supersymmetric standard model (MSSM), we find that in the parameter space allowed by current experimental constraints from colliders and dark matter detections, the MSSM can simultaneously explain both measurements on the edge of 2 σ level, taking theoretical uncertainties into consideration. The favored parameter space, characterized by a compressed spectrum between bino, wino and stau, with the stop being around 1 TeV, may be covered in the near future LHC searches. [ABSTRACT FROM AUTHOR]

Abstract: The high-energy and high-luminosity data-taking campaigns of the LEP collider provided the four collaborations, ALEPH, DELPHI, L3 and OPAL, with about 50000 W-boson pairs and about a thousand singly produced W bosons. This unique data sample has an unprecedented reach in probing some aspects of the Standard Model of the electroweak interactions, and this article reviews several achievements in the understanding of W-boson physics at LEP. The measurements of the cross-sections for W-boson production are discussed, together with their implication on the existence of the coupling between Z and W bosons. The precision measurements of the magnitude of triple gauge-boson couplings are presented. The obervation of the longitudinal helicity component of the W-boson spin, related to the mechanism of electroweak symmetry breaking, is described together with the techniques used to probe the CP and CPT symmetries in the W-boson system. A discussion on the intricacies of the measurment of the mass of the W boson, whose knowledge is indispensable to test the internal consistency of the Standard Model and estimate the mass of the Higgs boson, concludes this review. [Copyright &y& Elsevier]