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We present measurements of the lifetime in the exclusive decay channel J/0, with J/µ+µ- and 0p-, the B0 lifetime in the decay B0J/K with J/µ+µ- and K+-, and the ratio of these lifetimes. The analysis is based on approximately 250 pb-1 of data recorded with the D0 detector in p collisions at =1.96 TeV. The lifetime is determined to be ()=1.22(stat)±0.04(syst) ps, the B0 lifetime (B0)=1.40(stat)±0.03(syst) ps, and the ratio ()/(B0)=0.87(stat)±0.03(syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the lifetime based on a fully reconstructed decay channel

physical review letters

Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math>Lifetime in the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msup><mml:mi>Λ</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math…

Measurement of theΛb0Lifetime in the DecayΛb0→J/ψΛ0