Observation of Overlapping Spin-1 and Spin-3 ¯D0K− Resonances at Mass 2.86 GeV/c2

Abstract

The resonant substructure of B0s→¯D0K−π+ decays is studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collision data recorded by the LHCb detector. An excess at m(¯D0K−)≈2.86 GeV/c2 is found to be an admixture of spin-1 and spin-3 resonances. Therefore, the D∗sJ(2860)− state previously observed in inclusive e+e−→¯D0K−X and pp→¯D0K−X processes consists of at least two particles. This is the first observation of a heavy flavored spin-3 resonance, and the first time that any spin-3 particle has been seen to be produced in B decays. The masses and widths of the new states and of the D∗s2(2573)− meson are measured, giving the most precise determinations to date.