Study of Beauty Hadron Decays into Pairs of Charm Hadrons

The LHCb Collaboration

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26 Citations (Scopus)

Abstract

First observations of the decays Λ0b → Λþc D−ðsÞ are reported using data corresponding to an integratedluminosity of 3 fb−1 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 BðB0s → DþD−s Þ is made and a search is performed for the decays B0ðsÞ → Λþc Λ−c . The results obtained are BðΛ0b → Λþc D−Þ=BðΛ0b → Λþc D−s Þ ¼ 0.042 0.003ðstatÞ 0.003ðsystÞ; BðΛ0b → Λþc D−s ÞBðB¯ 0 → DþD−s Þ=BðΛ0b → Λþc π−ÞBðB¯ 0 → Dþπ−Þ¼ 0.96 0.02ðstatÞ 0.06ðsystÞ; BðB0s → DþD−s Þ=BðB¯ 0 → DþD−s Þ ¼ 0.038 0.004ðstatÞ 0.003ðsystÞ; BðB¯ 0 → Λþc Λ−c Þ=BðB¯ 0 → DþD−s Þ < 0.0022½95% C.L.; BðB0s → Λþc Λ−c Þ=BðB0s → DþD−s Þ < 0.30½95% C.L.: Measurement of the mass of the Λ0b baryon relative to the B¯ 0 meson gives MðΛ0bÞ − MðB¯ 0Þ ¼ 339.72 0.24ðstatÞ 0.18ðsystÞ MeV=c2. This result provides the most precise measurement of the mass of the Λ0b baryon to date.
Original languageEnglish
Article number202001
Number of pages9
JournalPhysical Review Letters
Volume112
Issue number20
DOIs
Publication statusPublished - 2014
Externally publishedYes

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