Studies of Bs2*(5840)0 and B s 1(5830) 0 mesons including the observation of the Bs2*(5840)0›B0KS0 decay in proton-proton collisions at ?s=8TeV

Measurements of Bs2*(5840)0 and B s 1(5830) 0 mesons are performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of [InlineEquation not available: see fulltext.], collected with the CMS detector at the LHC at a centre-of-mass energy of 8TeV. The analysis studies P-wave Bs0 meson decays into B (*) +K - and B(*)0KS0, where the B + and B 0 mesons are identified using the decays B +› J / ?K + and B 0› J / ?K *(892) 0. The masses of the P-wave Bs0 meson states are measured and the natural width of the Bs2*(5840)0 state is determined. The first measurement of the mass difference between the charged and neutral B * mesons is also presented. The Bs2*(5840)0 decay to B0KS0 is observed, together with a measurement of its branching fraction relative to the Bs2*(5840)0›B+K- decay. © 2018, CERN for the benefit of the CMS collaboration