Studies of ${\mathrm {B}} ^{*{\mathrm {s}}2}(5840)^0$ and ${\mathrm {B}} _{{\mathrm {s}}1}(5830)^0$ mesons including the observation of the ${\mathrm {B}} ^{*{\mathrm {s}}2}(5840)^0 \rightarrow {\mathrm {B}} ^0 \mathrm {K} ^0_{\mathrm {S}}$ decay in proton-proton collisions at $\sqrt{s}=8\,\text {TeV}$
Eur.Phys.J. C78 (2018) 939
The collaboration

Abstract (data abstract)
CERN-LHC-CMS. Studies of Bs*2(5840)0 and Bs1(5830)0 mesons in their decays into B(*)+K- and, for the first time, B(*)0 K0s.