Observation of the B0??0?0 decay from an amplitude analysis of B0? (p+p-)(p+p-) decays
Observation of the B0??0?0 decay from an amplitude analysis of B0? (p+p-)(p+p-) decays
复制标题
从 B0?0?0 振幅分析观察 B0??0?0 衰减
DOI：
10.1016/j.physletb.2015.06.027
复制
发表时间：
2015
影响因子：
4.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
分析了2011年和2012年LHCb实验记录的质子-质子碰撞数据，对应于3.0 fb−1的综合光度，以寻找无魅力的b0→ρ 0 ρ 0衰变。选择了600多个b0→（π+ π−）（π+ π−）信号衰减，在假设衰减中没有CP违逆的情况下，进行幅度分析，首次观察到b0→ρ 0 ρ 0衰减，具有7.1个标准差的显著性。b0→ρ 0 ρ 0衰变产生纵向极化最终态的分数测量为f L= 0.745−0.058+ 0.048 （stat）±0.034 （syst）。B 0→ρ 0 ρ 0分支分数，使用B 0→φ K(892) 0衰变作为参考，也被报道为B (B 0→ρ 0 ρ 0)=（0.94±0.17 （stat）±0.09 （syst）±0.06 (BF)）× 10−6。
Proton–proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb− 1, are analysed to search for the charmless B 0→ ρ 0 ρ 0 decay. More than 600 B 0→(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 B 0→ ρ 0 ρ 0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B 0→ ρ 0 ρ 0 decays yielding a longitudinally polarised final state is measured to be f L= 0.745− 0.058+ 0.048 (stat)±0.034 (syst). The B 0→ ρ 0 ρ 0 branching fraction, using the B 0→ ϕ K⁎(892) 0 decay as reference, is also reported as B (B 0→ ρ 0 ρ 0)=(0.94±0.17 (stat)±0.09 (syst)±0.06 (BF))× 10− 6.