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Abstract |
A search is presented for the two-body charmed baryonic decays, (B) over bar (0)((s)) -> Lambda(+)(c)(Lambda) over bar (-)(c), using a data sample collected by the LHCb experiment during 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb(-1). The first observation of the (B) over bar (0)(s) -> Lambda(+)(c)(Lambda) over bar (-)(c) decay is reported with 6.2 sigma significance along with 4.3 sigma evidence for the (B) over bar (0) -> Lambda(+)(c)(Lambda) over bar (-)(c) decay. The branching fractions are measured to be B((B) over bar (0) -> Lambda(+)(c)(Lambda) over bar (-)(c)) = (1.01(-0.28)(+0.27) +/- 0.08 +/- 0.15)x10(-5) and B((B) over bar (0)(s) -> Lambda(+)(c)(Lambda) over bar (-)(c)) = (5.0 +/- 1.3 +/- 0.5 +/- 0.8)x10(-5), where the first uncertainty is statistical, the second systematic, and the third due to external inputs. These results provide novel experimental inputs for the theoretical framework describing two-body baryonic decays of B mesons via W-emission and W-exchange mechanisms. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Jelavic, A.; Lane, J. J.; Liu, F. L.; Lobo, I.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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