Evidence for the decay B 0 ? J / ? ? and measurement of the relative branching fractions of B s 0 meson decays to J / ? ? and J / ? ? '
Evidence for the decay B 0 ? J / ? ? and measurement of the relative branching fractions of B s 0 meson decays to J / ? ? and J / ? ? '
复制标题
B 0 衰变的证据？
DOI：
10.1016/j.nuclphysb.2012.10.021
复制
发表时间：
2013
影响因子：
2.8
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
首次发现了B0→J/ψω衰变的证据，并利用LHCB实验在质心能量为→S=7TeV的质子-质子碰撞中收集的积分光度为1.0fB^−1的数据集，研究了B0√J/TeV和Bos→J/ψη‘衰变。这些衰变的分支分数相对于B0→J/ψρ0衰变的分支分数被测量：B(B0→J/ψω)/B(B0→J/ψρ0)=0.89±0.19(STAT)_{−0.13}^{+0.07}(SYST)，B(1.2(stat)_{−1.5}^{+1.1}(syst)_{−1.0}^{+1.1}(fd/fs)，→J/ψη)/B(B0→J/ψρ0)=14.0%B(1.1(stat)_{−1.3}^{+0.5}(syst)_{−0.9}^{+1.0}(fd/fs)→J/ψη‘)/B(B0→J/ψρ0)=12.7±f0，其中最后一个不确定度是由于已知的fd/f，即解释B0和B0S介子产生率不同的b夸克强子化因子的比率。测得B0S→J/ψη‘和B0S→J/ψη的支化分数之比为B(B0S→J/ψη’)/B(B0S→J/ψη)=0.90±0.09(STAT){−0.02}^{+0.06}(SYST)。
First evidence of the B0 → J/ψ ω decay is found and the B0s → J/ψ η and B0s → J/ψ η′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb^−1 collected by the LHCb experiment in proton–proton collisions at a centre-of-mass energy of √s = 7 TeV. The branching fractions of these decays are measured relative to that of the B0 → J/ψ ρ0 decay: B(B0 → J/ψ ω)/B(B0 → J/ψ ρ0) = 0.89 ± 0.19(stat)_{−0.13}^{+0.07}(syst), B(B0s → J/ψ η)/B(B0 → J/ψ ρ0) = 14.0 ± 1.2(stat)_{−1.5}^{+1.1}(syst)_{−1.0}^{+1.1}(fd/fs), B(B0s → J/ψ η′)/B(B0 → J/ψ ρ0) = 12.7 ± 1.1(stat)_{−1.3}^{+0.5}(syst)_{−0.9}^{+1.0}(fd/fs) where the last uncertainty is due to the knowledge of fd/fs, the ratio of b-quark hadronization factors that accounts for the different production rate of B0 and B0s mesons. The ratio of the branching fractions of B0s → J/ψ η′ and B0s → J/ψ η decays is measured to be B(B0s → J/ψη′)/B(B0s → J/ψ η) = 0.90 ± 0.09(stat)_{−0.02}^{+0.06}(syst).