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	Author	LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Lucio Martinez, M.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Svintozelskyi, V.; Velilla Serna, J.; Zhuo, J.
	Title	Observation of the decay χc1 (3872) → J/ψ μ+ μ-			Type	Journal Article
	Year	2026	Publication	Physical Review D	Abbreviated Journal	Phys. Rev. D
	Volume	113	Issue	7	Pages	072019 - 14pp
	Keywords
	Abstract	The first observation of the chi(c1) (3872) -> J/psi mu(+)mu(-) decay is reported using proton-proton collision data recorded with the LHCb detector corresponding to an integrated luminosity of 9 fb(-1). The decay mode is observed for the first time, with a significance of 6.5s. Its branching fraction is measured relative to the chi(c1) (3872) -> J/psi pi(+)pi(-) decay mode B(chi(c1)(3872) -> J/psi mu(+)mu(-))/B(chi(c1)(3872) -> J/psi pi(+)pi(-)) = (1.68 +/- 0.32 +/- 0.05) x 10(-3), where the first uncertainty includes both statistical contributions and systematic contributions which are uncorrelated between data-taking periods, and the second represents the systematic contributions that are correlated between data- taking periods.
	Address	[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Lobo, I.; Monk, M.; Song, R.; Walton, E. J.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia
	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:001777143000001			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	7265
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