Symmetry on Multiboson Physics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 1036

Special Issue Editor

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Guest Editor
Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
Interests: fundamental particle physics; future colliders

Special Issue Information

Dear Colleagues,

In the standard model of fundamental particles, spontaneous symmetry breaking happens when the Higgs mechanism provides some elementary particles with mass, such as the W- and Z-gauge bosons that transport the weak force. Meanwhile, other particles, such as the photon and gluon, that carry the force of electromagnetism and strong interactions, remain massless.

These bosons (especially the W, Z, photon, and Higgs bosons) can be exploited as novel probes either for standard model precision tests or new physics searches. Indeed, with the high energy and luminosity of the LHC, it has become possible to study multiboson-related topics, including double- or triple-gauge boson productions,  vector boson fusion or scattering, and new physics searches in detail, either indirectly through effective field theory or directly for resonance decay into multiple bosons with high momenta. Additionally, many techniques have been developed, including jet substructure and deep learning techniques, to hadronically identify the decay of boosted bosons.

These topics are quite popular in the ongoing ATLAS and CMS experiments, and in study of future colliders, including electron–positron and muon–muon colliders. The goal of this Special Issue, entitled "Symmetry on Multiboson Physics", is to report on the latest advances on all these multiboson-related topics. We kindly invite all researchers working in the area to contribute to this Special Issue.

Dr. Qiang Li
Guest Editor

Manuscript Submission Information

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  • W/Z boson
  • photon
  • Higgs boson
  • standard model measurements
  • vector boson fusion/scattering
  • di/tri-boson
  • boosted jet
  • deep learning

Published Papers (1 paper)

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12 pages, 365 KiB  
Approximate N5LO Higgs Boson Decay Width Γ(Hγγ)
by Yu-Feng Luo, Jiang Yan, Zhi-Fei Wu and Xing-Gang Wu
Symmetry 2024, 16(2), 173; - 01 Feb 2024
Viewed by 574
The precision and predictive power of perturbative QCD (pQCD) prediction depends on both a precise, convergent, fixed-order series and a reliable way of estimating the contributions of unknown higher-order (UHO) terms. It has been shown that by applying the principle of maximum conformality [...] Read more.
The precision and predictive power of perturbative QCD (pQCD) prediction depends on both a precise, convergent, fixed-order series and a reliable way of estimating the contributions of unknown higher-order (UHO) terms. It has been shown that by applying the principle of maximum conformality (PMC), which applies the renormalization group equation recursively to set the effective magnitude of αs of the process, the remaining conformal coefficients will be well matched with the corresponding αs at each order, leading to a scheme-and-scale invariant and more convergent perturbative series. The PMC series, being satisfied with the standard renormalization group invariance, has a rigorous foundation. Thus it not only can be widely applied to virtually all high-energy hadronic processes, but also can be a reliable platform for estimating UHO contributions. In this paper, by using the total decay width Γ(Hγγ) which has been calculated up to N4LO QCD corrections, we first derive its PMC series by using the PMC single-scale setting approach and then estimate its unknown N5LO contributions by using a Bayesian analysis. The newly suggested Bayesian-based approach estimates the magnitude of the UHO contributions based on an optimized analysis of the probability density distribution, and the predicted UHO contribution becomes more accurate when more loop terms have been known to tame the probability density function. Using the top-quark pole mass Mt = 172.69 GeV and the Higgs mass MH = 125.25 GeV as inputs, we obtain Γ(Hγγ)=9.56504keV, and the estimated N5LO contribution to the total decay width is ΔΓH=±1.65×104keV for the smallest credible interval of 95.5% degree of belief. Full article
(This article belongs to the Special Issue Symmetry on Multiboson Physics)
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