Observation of the $B^0 \to ρ^0 ρ^0$ decay from an amplitude analysis of $B^0 \to (π^+π^-)(π^+π^-)$ decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 24 октября 2015 г.
Аннотация:Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, co\-rres\-pon\-ding to an integrated luminosity of 3.0 fb−1 , are a\-na\-lysed to search for the charmless B0→ρ0ρ0 decay. More than 600 B0→(π+π−)(π+π−) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0→ρ0ρ0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0→ρ0ρ0 decays yielding a longitudinally polarised final state is measured to be fL=0.745+0.048−0.058(stat)±0.034(syst). The B0→ρ0ρ0 branching fraction, using the B0→ϕK∗(892)0 decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10−6.