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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	Searches for B0 → K+ π- τ+τ- and Bs0 → K+K- τ+τ- Decays			Type	Journal Article
	Year	2026	Publication	Physical Review Letters	Abbreviated Journal	Phys. Rev. Lett.
	Volume	136	Issue	18	Pages	181802 - 14pp
	Keywords
	Abstract	The first searches for B-0 -> K+ pi(-) tau(+)tau and B-s(0) -> K+ pi(-) tau(+)tau(-) decays at the LHCb experiment are conducted with pp collision data corresponding to an integrated luminosity of 5.4 fb(-1). The tau leptons are reconstructed using the tau(+) -> mu(+)(nu) over bar tau nu(mu) decay and the results are presented in bins of K+pi(-) or K+K- mass. No signal is observed and upper limits are set on the branching fractions. The searches result in the first upper limits for B-0 -> K+ pi(-) tau(+)tau(-) decays outside the K(892)(0) region in K+pi(-) mass and the first limits for B-s(0) -> K+ pi(-) tau(+)tau(-) decays. The searches are recast into limits on the decays B-0 -> K(892)(0)tau(+)tau(-) tand B-s(0) -> phi(1020)tau(+)tau(-) , yielding 2.8 x 10(-4) (2.5 x 10(-4)) and 4.7 x 10(-4) (4.1 x 10(-4)) at the 95% (90%) confidence level, respectively. For the decay BB0 -> K*(892)(0)tau(+)tau(-), this result improves on the current best upper limit by an order of magnitude.
	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	0031-9007	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001777178400002			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	7286
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