First observation of the decay B s 0 → K S 0 K ∗(892)0 at LHCbстатья
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Дата последнего поиска статьи во внешних источниках: 26 января 2017 г.
Аннотация:A search for B0(s)→K0SK∗(892)0B(s)0→KS0K∗(892)0 decays is performed using pppp collision data, corresponding to an integrated luminosity of 1.0 fb−11.0 fb−1, collected with the LHCb detector at a centre-of-mass energy of 7 TeV7 TeV. The B0s→K0SK∗(892)0Bs0→KS0K∗(892)0 decay is observed for the first time, with a significance of 7.1 standard deviations. The branching fraction is measured to be
B(B0s→K¯0K∗(892)0)+B(B0s→K0K¯∗(892)0)=(16.4±3.4±2.3)×10−6,
B(Bs0→K¯0K∗(892)0)+B(Bs0→K0K¯∗(892)0)=(16.4±3.4±2.3)×10−6,
where the first uncertainty is statistical and the second is systematic. No evidence is found for the decay B0→K0SK∗(892)0B0→KS0K∗(892)0 and an upper limit is set on the branching fraction, B(B0→K¯0K∗(892)0)+B(B0→K0K¯∗(892)0)<0.96 ×10−6,B(B0→K¯0K∗(892)0)+B(B0→K0K¯∗(892)0)<0.96 ×10−6, at 90%90% confidence level. All results are consistent with Standard Model predictions.