Studies of B *_s2(5840)⁰ B s 2 ∗ ( 5840 ) 0 and B _s1(5830)⁰ B s 1 ( 5830 ) 0 mesons including the observation of the B *_s2(5840)⁰ → B ⁰ K ⁰S B s 2 ∗ ( 5840 ) 0 → B 0 K S 0 decay in proton-proton collisions at √s=8\,TeV s = 8 TeV

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Measurements of B * s2 (5840) 0 and B s1 (5830) 0 mesons are performed using a data sample of protonproton collisions corresponding to an integrated luminosity of 19.6 fb -1 , collected with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV. The analysis studies P-wave B 0 s meson decays into B ( * )+ K -and B ( * )0 K 0 S , 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 B 0 s meson states are measured and the natural width of the B * s2 (5840) 0 state is determined. The first measurement of the mass difference between the charged and neutral B * mesons is also presented. The B * s2 (5840) 0 decay to B 0 K 0 S is observed, together with a measurement of its branching fraction relative to the B * s2 (5840) 0 B + K - decay.