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	Author	LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Zhuo, J.
	Title	First Evidence for Direct CP Violation in Beauty to Charmonium Decays			Type	Journal Article
	Year	2025	Publication	Physical Review Letters	Abbreviated Journal	Phys. Rev. Lett.
	Volume	134	Issue	10	Pages	101801 - 13pp
	Keywords
	Abstract	The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+ -> J/psi pi(+) are precisely measured relative to the favored decay B+ -> J/psi K+ using a sample of protonproton collision data corresponding to an integrated luminosity of 5.4 fb(-1) recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are Delta A(CP)= A(CP)(B+ -> J/psi pi(+))-A(CP)(B+ -> J/psi K+)=(1.29 +/- 0.49 +/- 0.08)x10(-2), R-pi/K [B(B+ -> J/psi pi(+))/ B(B+-> J/psi K+)] = (3.852 +/- 0.022 +/- 0.018)x10(-2), where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeVin 2011 and 2012 yields Delta A(CP) = (1.42 +/- 0.43 +/- 0.08) x 10(-2) and R pi/K = (3.846 +/- 0.018 +/- 0.018) x 10(-2). The combined Delta A(CP) value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
	Address	[Bonacci, R. B.; Dekkers, S.; Egede, U.; Fujii, Y.; Hadavizadeh, T.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, 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	0031-9007	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001498264200001			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6796
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