Observation of a new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Ξ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math> state

Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb -1 , the observation of a new excited 0 b resonance decaying to the - b final state is presented. The state, referred to as b 6227 0 , has a measured mass and natural width of m b 6227 0 6227:1 1.4 -1.5 AE 0.5 MeV and b 6227 0 18:6 5.0 -4.1 AE 1.4 MeV, where the uncertainties are statistical and systematic. The production rate of the b 6227 0 state relative to that of the - b baryon in the kinematic region 2 < < 5 and p T < 30 GeV is measured to be