Observations of $Λ_b^0 \to ΛK^+π^-$ and $Λ_b^0 \to ΛK^+K^-$ decays and searches for other $Λ_b^0$ and $Ξ_b^0$ decays to $Λh^+h^{\prime -}$ final states
hep-ex
/ Authors
LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander
and 724 more authors
S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d'Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov
/ Abstract
A search is performed for the charmless three-body decays of the $Λ_b^0$ and $Ξ_b^0$ baryons to the final states $Λh^+h^{\prime -}$, where $h^{(\prime)} = π$ or $K$. The analysis is based on a data sample, corresponding to an integrated luminosity of $3 \rm fb^{-1}$ of $pp$ collisions, collected by the LHCb experiment. The $Λ_b^0 \to ΛK^+π^-$ and $Λ_b^0 \to ΛK^+K^-$ decays are observed for the first time and their branching fractions and $CP$ asymmetry parameters are measured. Evidence is seen for the $Λ_b^0 \to Λπ^+π^-$ decay and limits are set on the branching fractions of $Ξ_b^0$ baryon decays to the $Λh^+h^{\prime -}$ final states.