Recent B+→K+νν¯ excess and muon g−2 illuminating light dark sector with Higgs portal

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-03-27 DOI:10.1103/physrevd.111.055029

Shu-Yu Ho, Jongkuk Kim, Pyungwon Ko

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引用次数: 0

Abstract

The Belle II collaboration recently announced that they observed the B+→K+νν¯ decay process for the first time. However, their result encounters a 2.7σ deviation from the Standard Model (SM) calculation. Additionally, Fermilab released new data on muon g−2 away from the SM expectation with 5.1σ. In this paper, we study the simplest UV-complete U(1)Lμ−Lτ-charged complex scalar dark matter (DM) model. Thanks to the existence of light dark Higgs boson and light dark photon, we can explain the observed relic density of DM and resolve the results reported by both Belle II and Fermilab experiments simultaneously. As a by-product, the Hubble tension can be alleviated by taking ΔNeff≃0.3 induced by the light dark photon, which could be tested by CMB stage-4 and new NA64 experimental data in the near future. In addition, our light DM mass is highly testified by future data released by Belle II and CMB stage-4.

Published by the American Physical Society

2025

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.