Abstract: 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.

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