Abstract
Decays of beauty baryons to the $D^0 p h^-$ and $\Lambda_c^+ h^-$ final states (where $h$ indicates a pion or a kaon) are studied using a data sample of $pp$ collisions, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb detector. The Cabibbo-suppressed decays $\Lambda_b^0\to D^0 p K^-$ and $\Lambda_b^0\to \Lambda_c^+ K^-$ are observed and their branching fractions are measured with respect to the decays $\Lambda_b^0\to D^0 p \pi^-$ and $\Lambda_b^0\to \Lambda_c^+ \pi^-$. In addition, the first observation is reported of the decay of the neutral beauty-strange baryon $\Xi_b^0$ to the $D^0 p K^-$ final state, and a measurement of the $\Xi_b^0$ mass is performed. Evidence of the $\Xi_b^0\to \Lambda_c^+ K^-$ decay is also reported.
Highlights
There has been great progress in studies of beauty mesons, both at the B factories and hadron machines, the beauty baryon sector remains largely unexplored
This paper reports the results of a study of beauty baryon decays into D0pπ−, D0pK−, Λþc π−, and Λþc K− final states
The D0 meson is reconstructed in the favored final state K−πþ and the Λþc baryon in the pK−πþ mode
Summary
There has been great progress in studies of beauty mesons, both at the B factories and hadron machines, the beauty baryon sector remains largely unexplored. This paper reports the results of a study of beauty baryon decays into D0pπ−, D0pK−, Λþc π−, and Λþc K− final states.. The D0 meson is reconstructed in the favored final state K−πþ and the Λþc baryon in the pK−πþ mode. In this way, the Λ0b → Λþc π− and Λ0b → D0pπ− decays have the same final state particles, and some of the systematic uncertainties, in particular those related to particle identification (PID), cancel in the ratio. Been observed in one decay mode, Ξth0be→Ξ0bΞbþcaπry−o[n3]h;atshuosn,liyt is interesting to study other final states, as well as to measure its mass more precisely. The difference of Ξ0b and Λ0b masses, mΞ0b − mΛ0b , is measured
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