A hierarchical NeuroBayes-based algorithm for full reconstruction of B mesons at B factories

A hierarchical NeuroBayes-based algorithm for full reconstruction of B mesons at B factories
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基于神经贝叶斯的分层算法，用于 B 工厂的 B 介子的完全重建

DOI：
10.1016/j.nima.2011.06.008
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发表时间：
2011
期刊：
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
影响因子：
1.4
通讯作者：
A. Zupanc
A. Zupanc
中科院分区：
物理与天体物理3区
文献类型：
--
作者：
M. Feindt;F. Keller;M. Kreps;T. Kuhr;S. Neubauer;D. Zander;A. Zupanc

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我们描述了一种新的b介子全重构算法，该算法是为b工厂KEKB的Belle实验设计的，这是一个非对称e+e−对撞机，在其运行期间收集了771.6×106BB¯对的数据样本。为了最大限度地提高重构B衰减通道的数量，该算法采用了分层重构过程和概率演算来代替经典的选择切割。多元分析软件包NeuroBayes被广泛使用，以保持最高可能的效率，鲁棒性和可接受的CPU时间消耗之间的平衡。总共使用71个神经网络重构了1104个独占衰减通道。总的来说，我们分别在0.28%或0.18%的BB¯事件中正确地重建了一个B±或B0候选。与Belle实验中使用的基于切割的经典重建算法相比，效率提高了大约2倍，具体取决于所考虑的分析。新的框架还具有自由选择完全重构样品所需的纯度或效率的能力。如果期望与经典全重构代码相同的纯度（~ 25%），则效率仍然高出近2倍。另一方面，如果选择与经典全重构相似的效率水平，则纯度从~ 25%上升到近90%。
We describe a new B-meson full reconstruction algorithm designed for the Belle experiment at the B-factory KEKB, an asymmetric e+e−collider that collected a data sample of 771.6×106BB¯ pairs during its running time. To maximize the number of reconstructed B decay channels, it utilizes a hierarchical reconstruction procedure and probabilistic calculus instead of classical selection cuts. The multivariate analysis package NeuroBayes was used extensively to hold the balance between highest possible efficiency, robustness and acceptable consumption of CPU time. In total, 1104 exclusive decay channels were reconstructed, employing 71 neural networks altogether. Overall, we correctly reconstruct one B±or B0candidate in 0.28% or 0.18% of the BB¯ events, respectively. Compared to the cut-based classical reconstruction algorithm used at the Belle experiment, this is an improvement in efficiency by roughly a factor of 2, depending on the analysis considered. The new framework also features the ability to choose the desired purity or efficiency of the fully reconstructed sample freely. If the same purity as for the classical full reconstruction code is desired (∼25%), the efficiency is still larger by nearly a factor of 2. If, on the other hand, the efficiency is chosen at a similar level as the classical full reconstruction, the purity rises from ∼25% to nearly 90%.
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DOI： --
发表时间： 2005
期刊：
影响因子： --
作者：
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使用完全重建标签测量 B 介子的包容性半轻部分率来确定 Vub
DOI： --
发表时间： 2005
期刊： Physical Review Letters 95
影响因子： --
作者：
Geni Carmen Zanol;瀬古澤由彦;菅谷純子;弦間 洋;I.Bizjak et al.
通讯作者： I.Bizjak et al.
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B0的证据---> rho0 pi0
DOI： --
发表时间： 2003
期刊：
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