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	Author	NA64 Collaboration (Andreev, Y.M. et al); Molina Bueno, L.; Tuzi, M.
	Title	Dark-Sector Search via Pion-Produced η and η' Mesons Decaying Invisibly in the NA64h Detector			Type	Journal Article
	Year	2024	Publication	Physical Review Letters	Abbreviated Journal	Phys. Rev. Lett.
	Volume	133	Issue	12	Pages	121803 - 6pp
	Keywords
	Abstract	We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar eta and eta ' mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV pi- on nuclei of an active target as the source of neutral mesons. The eta,eta'-> invisible events would exhibit themselves via a striking signature-the complete disappearance of the incoming beam energy in the detector. No evidence for such events has been found with 2.9x109 pions on target accumulated during one day of data taking. This allows us to set a stringent limit on the branching ratio Br(eta'-> invisible) < 2.1 x 10(-4) improving the current bound by a factor of similar or equal to 3. We also set a limit on Br(eta -> invisible) < 1.1 x 10(-4) comparable with the existing one. These results demonstrate the great potential of our approach and provide clear guidance on how to enhance and extend the sensitivity for dark sector physics from future searches for invisible neutral meson decays.
	Address	[Antonov, A.; Bisio, P.; Celentano, A.; Marini, A.; Marsicano, L.] INFN, Sez Genova, I-16147 Genoa, Italy, Email: paolo.crivelli@cern.ch;
	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	0031-9007	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001321201700003			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6291
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