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Is the w-boson mass enhanced by the axion-like particle,dark photon,or chameleon dark energy?

Science China(Physics,Mechanics & Astronomy) 2022年第12期65卷 145-152页

作者： Guan-wen Yuan Lei Zu Lei Feng Yi-Fu Cai Yi-Zhong Fan Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei230026China Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei230026China CAS Key Laboratory for Researches in Galaxies and Cosmology University of Science and Technology of ChinaHefei230026China

The w-boson mass(m w=(80.4335±0.0094)Ge V)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 *** 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 *** 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 *** find that the ALP and DP interpretations have been significantly narrowed down by global electroweak *** possibility of attributing the w-boson mass anomaly to the chameleon DE is ruled out by other experiments.

关键词： w-boson mass axion-like particle dark photon chameleon dark energy

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Understanding PDF uncertainty in w boson mass measurements

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Chinese Physics C 2022年第12期46卷 179-193页

作者： Jun Gao Dianyu Liu Keping Xie NPAC Shanghai Key Laboratory for Particle Physics and CosmologySchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai 200240China Pittsburgh Particle Physics Astrophysicsand Cosmology CenterDepartment of Physics and AstronomyUniversity of PittsburghPittsburghPA 15260USA

we study the dependence of the transverse mass distribution of charged leptons and the missing energy on parton distributions(PDFs)adapted to w boson mass measurements at the CDF and ATLAS *** compare the shape variations of the distribution induced by different PDFs and find that the spread of predictions from different PDF sets can be significantly larger than the PDF uncertainty predicted by a specific PDF *** suggest analyzing the experimental data using up-to-date PDFs to gain a better understanding of the PDF uncertainties in w boson mass *** also perform a series of Lagrange multiplier scans to identify the constraints on the transverse mass distribution imposed by individual data sets in the CT18 global *** the case of the CDF measurement,the distribution is mostly sensitive to d-quark PDFs in the intermediate x region,which are largely constrained by DIS and Drell-Yan data on deuteron targets and Tevatron lepton charge asymmetry data.

关键词： w-boson mass PDF uncertainty CT18

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