Dark moments for the Standard Model?

Abstract If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop graphs. In addition to the familiar ∼ e...

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Autor principal:	Thomas G. Rizzo
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Beyond Standard Model Cosmology of Theories beyond the SM Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/4a3540ffa9ba4439bdf5fcddc1e88a9d
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spelling	oai:doaj.org-article:4a3540ffa9ba4439bdf5fcddc1e88a9d2021-11-14T12:42:26ZDark moments for the Standard Model?10.1007/JHEP11(2021)0351029-8479https://doaj.org/article/4a3540ffa9ba4439bdf5fcddc1e88a9d2021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)035https://doaj.org/toc/1029-8479Abstract If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop graphs. In addition to the familiar ∼ eϵQ strength, QED-like interaction for the dark photon (DP), in some setups different loop graphs of these PM states can also induce other coupling structures for the SM fermions that may come to dominate in at least some regions of parameter space regions and which can take the form of ‘dark’ moments, e.g., magnetic dipole-type interactions in the IR, associated with a large mass scale, Λ. In this paper, motivated by a simple toy model, we perform a phenomenological investigation of a possible loop-induced dark magnetic dipole moment for SM fermions, in particular, for the electron. We show that at the phenomenological level such a scenario can not only be made compatible with existing experimental constraints for a significant range of correlated values for Λ and the dark U(1) D gauge coupling, g D , but can also lead to quantitatively different signatures once the DP is discovered. In this setup, assuming complex scalar DM to satisfy CMB constraints, parameter space regions where the DP decays invisibly are found to be somewhat preferred if PM mass limits from direct searches at the LHC and our toy model setup are all taken seriously. High precision searches for, or measurements of, the e + e − → γ + DP process at Belle II are shown to provide some of the strongest future constraints on this scenario.Thomas G. RizzoSpringerOpenarticleBeyond Standard ModelCosmology of Theories beyond the SMNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-32 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model Cosmology of Theories beyond the SM Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model Cosmology of Theories beyond the SM Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Thomas G. Rizzo Dark moments for the Standard Model?
description	Abstract If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop graphs. In addition to the familiar ∼ eϵQ strength, QED-like interaction for the dark photon (DP), in some setups different loop graphs of these PM states can also induce other coupling structures for the SM fermions that may come to dominate in at least some regions of parameter space regions and which can take the form of ‘dark’ moments, e.g., magnetic dipole-type interactions in the IR, associated with a large mass scale, Λ. In this paper, motivated by a simple toy model, we perform a phenomenological investigation of a possible loop-induced dark magnetic dipole moment for SM fermions, in particular, for the electron. We show that at the phenomenological level such a scenario can not only be made compatible with existing experimental constraints for a significant range of correlated values for Λ and the dark U(1) D gauge coupling, g D , but can also lead to quantitatively different signatures once the DP is discovered. In this setup, assuming complex scalar DM to satisfy CMB constraints, parameter space regions where the DP decays invisibly are found to be somewhat preferred if PM mass limits from direct searches at the LHC and our toy model setup are all taken seriously. High precision searches for, or measurements of, the e + e − → γ + DP process at Belle II are shown to provide some of the strongest future constraints on this scenario.
format	article
author	Thomas G. Rizzo
author_facet	Thomas G. Rizzo
author_sort	Thomas G. Rizzo
title	Dark moments for the Standard Model?
title_short	Dark moments for the Standard Model?
title_full	Dark moments for the Standard Model?
title_fullStr	Dark moments for the Standard Model?
title_full_unstemmed	Dark moments for the Standard Model?
title_sort	dark moments for the standard model?
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/4a3540ffa9ba4439bdf5fcddc1e88a9d
work_keys_str_mv	AT thomasgrizzo darkmomentsforthestandardmodel
_version_	1718429044420116480

Dark moments for the Standard Model?

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