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 language | English |
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Article number | 202001 |
Number of pages | 9 |
Journal | Physical Review Letters |
Volume | 112 |
Issue number | 20 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |