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	Author	Bauer, M.; Perez-Soler, J.; Shergold, J.D.
	Title	Dark matter pair absorption			Type	Journal Article
	Year	2026	Publication	Physical Review D	Abbreviated Journal	Phys. Rev. D
	Volume	114	Issue	4	Pages	043017 - 18pp
	Keywords
	Abstract	We present a comprehensive analysis of the sensitivity of atomic transitions to light dark matter pair absorption. Unlike scattering, where only a fraction of the dark matter energy is deposited, pair absorption processes absorb the full mass and are therefore capable of constraining far lighter dark matter. Spin-flip and fine-structure transitions are able to constrain electroweak scale axial-vector couplings for bosonic dark matter with μeV to eV masses, while principal quantum number transitions are able to set similar constraints on bosonic dark matter with scalar couplings. Unfortunately, pair absorption is largely insensitive to light fermionic dark matter due to its necessarily tiny density at low masses. We also demonstrate the sensitivity of pair absorption to the cosmic neutrino background and find that spin-flip transitions can set constraints on the overdensity parameter of eta nu less than or similar to 109 for neutrino masses m nu less than or similar to 1 meV, around 100 times stronger than existing constraints.
	Address	[Bauer, Martin] Univ Durham, Inst Particle Phys Phenomenol, Dept Phys, Durham DH1 3LE, England; [Perez-Soler, Javier; Shergold, Jack D.] Univ Valencia, Inst Fis Corpuscular, Parc Cientif UV, CSIC, C-Catedrat Jose Beltran 2, E-46980 Paterna, Spain
	Corporate Author				Thesis
	Publisher	Amer Physical Soc	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	2470-0010	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001846046200001			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	7378
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