Determination of A b B using inclusive charge reconstruction and lifetime tagging at LEP 1

Determination of A b B using inclusive charge reconstruction and lifetime tagging at LEP 1
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在 LEP 1 处使用包含电荷重建和寿命标记来确定 A b B

DOI:
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发表时间:
2001
期刊:
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影响因子:
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通讯作者:
C. Haag
C. Haag
中科院分区:
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文献类型:
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作者:
M. Elsing;B. Schwering;T. Allmendinger;G. Barker;M. Feindt;C. Haag

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采用一种新颖的方法测量了 DELPHI 探测器在 1992 年至 1995 年收集的 2,636,000 个强子事件样本中 Z 极的 b 夸克前后不对称性。对数据应用了增强型冲击参数标签,以获得高纯度的 b 样本。对于每个事件半球,使用神经网络标签确定相应夸克或反夸克的电荷,该神经网络标签以最佳方式组合来自顶点电荷、射流电荷以及已识别的轻子和强子的全部可用电荷信息。正确识别 b 夸克和反夸克的概率是根据数据本身来校准的,比较双半球标记的同号和异号事件的比率。 b 夸克前后不对称性是根据差分不对称性确定的,并考虑了半球相关性和背景贡献引起的小修正。结果是:A b B (91.26 GeV) = 0:0931 0:0034(统计) 0:0017(系统)
A novel method is used to measure the b quark forward-backward asymmetry at the Z pole on a sample of 2,636,000 hadronic events collected with the DELPHI detector in 1992 to 1995. An enhanced impact parameter tag is applied to the data to obtain a high purity b sample. For each event hemisphere the charge of the corresponding quark or anti-quark is determined using a neural network tag which combines in an optimal way the full available charge information from the vertex charge, the jet charge and from identied leptons and hadrons. The probability to correctly identify b quarks and anti-quarks is calibrated on data itself comparing the rates of double hemisphere tagged like-sign and unlike-sign events. The b quark forward-backward asymmetry is determined from the dieren tial asymmetry taking small corrections due to hemisphere correlations and background contributions into account. The result is: A b B (91.26 GeV) = 0:0931 0:0034(stat.) 0:0017(syst.)
DOI: 10.1073/pnas.1916820117
发表时间: 2020-01-21
影响因子: 11.1
作者:
Hung, Ruei-Jiun;Hu, Yanhui;Perrimon, Norbert
通讯作者: Perrimon, Norbert