Muon g − 2 from millicharged hidden confining sector

Abstract We provide a novel explanation to the muon g − 2 excess with new physics contributions at the two-loop level. In this scenario, light millicharged particles are introduced to modify the photon vacuum polarization that contributes to muon g − 2 at one additional loop. The muon g − 2 excess c...

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Autores principales:	Yang Bai, Seung J. Lee, Minho Son, Fang Ye
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Beyond Standard Model Cosmology of Theories beyond the SM Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/af131f511c254d49b53b8a5c44e1ca53
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spelling	oai:doaj.org-article:af131f511c254d49b53b8a5c44e1ca532021-11-08T11:16:29ZMuon g − 2 from millicharged hidden confining sector10.1007/JHEP11(2021)0191029-8479https://doaj.org/article/af131f511c254d49b53b8a5c44e1ca532021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)019https://doaj.org/toc/1029-8479Abstract We provide a novel explanation to the muon g − 2 excess with new physics contributions at the two-loop level. In this scenario, light millicharged particles are introduced to modify the photon vacuum polarization that contributes to muon g − 2 at one additional loop. The muon g − 2 excess can be explained with the millicharged particle mass m χ around 10 MeV and the product of the multiplicity factor and millicharge squared of N χ ε 2 ∼ 10 −3. The minimal model faces severe constraints from direct searches at fixed-target experiments and astrophysical observables. However, if the millicharged particles are also charged under a hidden confining gauge group SU(N χ ) with a confinement scale of MeV, hidden-sector hadrons are unstable and can decay into neutrinos, which makes this scenario consistent with existing constraints. This explanation can be well tested at low-energy lepton colliders such as BESIII and Belle II as well as other proposed fixed-target experiments.Yang BaiSeung J. LeeMinho SonFang YeSpringerOpenarticleBeyond Standard ModelCosmology of Theories beyond the SMNeutrino PhysicsNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-20 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model Cosmology of Theories beyond the SM Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model Cosmology of Theories beyond the SM Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Yang Bai Seung J. Lee Minho Son Fang Ye Muon g − 2 from millicharged hidden confining sector
description	Abstract We provide a novel explanation to the muon g − 2 excess with new physics contributions at the two-loop level. In this scenario, light millicharged particles are introduced to modify the photon vacuum polarization that contributes to muon g − 2 at one additional loop. The muon g − 2 excess can be explained with the millicharged particle mass m χ around 10 MeV and the product of the multiplicity factor and millicharge squared of N χ ε 2 ∼ 10 −3. The minimal model faces severe constraints from direct searches at fixed-target experiments and astrophysical observables. However, if the millicharged particles are also charged under a hidden confining gauge group SU(N χ ) with a confinement scale of MeV, hidden-sector hadrons are unstable and can decay into neutrinos, which makes this scenario consistent with existing constraints. This explanation can be well tested at low-energy lepton colliders such as BESIII and Belle II as well as other proposed fixed-target experiments.
format	article
author	Yang Bai Seung J. Lee Minho Son Fang Ye
author_facet	Yang Bai Seung J. Lee Minho Son Fang Ye
author_sort	Yang Bai
title	Muon g − 2 from millicharged hidden confining sector
title_short	Muon g − 2 from millicharged hidden confining sector
title_full	Muon g − 2 from millicharged hidden confining sector
title_fullStr	Muon g − 2 from millicharged hidden confining sector
title_full_unstemmed	Muon g − 2 from millicharged hidden confining sector
title_sort	muon g − 2 from millicharged hidden confining sector
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/af131f511c254d49b53b8a5c44e1ca53
work_keys_str_mv	AT yangbai muong2frommillichargedhiddenconfiningsector AT seungjlee muong2frommillichargedhiddenconfiningsector AT minhoson muong2frommillichargedhiddenconfiningsector AT fangye muong2frommillichargedhiddenconfiningsector
_version_	1718442271803703296

Muon g − 2 from millicharged hidden confining sector

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