Study of beauty hadron decays into Pairs of charm hadrons

LHCb Collaboration

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Abstract

First observations of the decays Λ<sub>b</sub> <sup>0</sup>→ Λ<sub>c</sub> <sup>+</sup>D<sub>(s)</sub> <sup>-</sup>are reported using data corresponding to an integrated luminosity of 3fb<sup>-1</sup>collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B(B<sub>s</sub> <sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>) is made and a search is performed for the decays B<sub>(s)</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>Λ<sub>c</sub> <sup>-</sup>. The results obtained are B(Λ<sub>b</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>D<sup>-</sup>)/ B(Λ<sub>b</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>D<sub>s</sub> <sup>-</sup>)=0.042±0.003(stat)±0.003(syst), [B(Λ<sub>b</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>D<sub>s</sub> <sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>)]/[B(Λ<sub>b</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>π<sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>π<sup>-</sup>)]=0.96±0.02(stat)±0.06(syst),B(B<sub>s</sub> <sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>)/ B(B̄<sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>)=0. 038±0.004(stat)±0.003(syst),B(B̄<sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>Λ<sub>c</sub> <sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>)<0.0022[95%C.L.], B(B<sub>s</sub> <sup>0</sup>→Λ<sub>c</sub> <sup>+</sup>Λ<sub>c</sub> <sup>-</sup>)/B(B<sub>s</sub> <sup>0</sup>→D<sup>+</sup>D<sub>s</sub> <sup>-</sup>)<0.30[95%C.L.]. Measurement of the mass of the Λ<sub>b</sub> <sup>0</sup>baryon relative to the B̄<sup>0</sup>meson gives M(Λ<sub>b</sub> <sup>0</sup>)-M(B̄<sup>0</sup>)=339. 72±0.24(stat)±0.18(syst)MeV/c<sup>2</sup>. This result provides the most precise measurement of the mass of the Λ<sub>b</sub> <sup>0</sup>baryon to date.

Original languageEnglish (US)
Article number202001
JournalPhysical Review Letters
Volume112
Issue number20
DOIs
StatePublished - May 21 2014

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