Dalitz analysis of B -> K pi(+)psi ' decays and the Z(4430)(+)
Dalitz analysis of B -> K pi(+)psi ' decays and the Z(4430)(+)
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DOI：
10.1103/physrevd.80.031104
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发表时间：
2009-05
影响因子：
5
通讯作者：
R. Mizuk;for the Belle collaboration
中科院分区：
文献类型：
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作者：
R. Mizuk;for the Belle collaboration
通过对B—> K pi psi′衰减的Dalitz图分析，我们发现Z(4430)+—> pi+ psi′的信号，质量M= (4443(+15-12)(+19-13))MeV/c^2，宽度Gamma= (107(+86-43)(+74-56))MeV，产物分支分数BR(B0—> K- Z(4430)+) x BR（Z(4430)+—> pi+ psi′）= (3.2(+1.8-0.9)(+5.3-1.6))x 10^{-5}，显著性为6.4sigma，与先前基于相同数据样本的Belle测量结果一致。此外，我们确定了分支分数BR(B^0—> K*(892)^0 psi')= (5.52（+0.35-0.32)(+0.53-0.58)） × 10^{-4}和K*(892)^0介子纵向极化分数f_L= 44.8(+4.0-2.7)(+4.0-5.3)%。这些结果来自KEKB不对称能量e+e对撞机Belle探测器在Upsilon（4S）共振附近收集的605fb^{-1}数据样本，其中包含6.57亿个b -反b对。
From a Dalitz plot analysis of B --> K pi psi' decays, we find a signal for Z(4430)+ --> pi+ psi' with a mass M= (4443(+15-12)(+19-13))MeV/c^2, width Gamma= (107(+86-43)(+74-56))MeV, product branching fraction BR(B0 --> K- Z(4430)+) x BR(Z(4430)+ --> pi+ psi')= (3.2(+1.8-0.9)(+5.3-1.6)) x 10^{-5}, and significance of 6.4sigma that agrees with previous Belle measurements based on the same data sample. In addition, we determine the branching fraction BR(B^0 --> K*(892)^0 psi')= (5.52(+0.35-0.32)(+0.53-0.58)) x 10^{-4} and the fraction of K*(892)^0 mesons that are longitudinally polarized f_L= 44.8(+4.0-2.7)(+4.0-5.3)%. These results are obtained from a 605fb^{-1} data sample that contains 657 million B-anti-B pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider.