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
复制标题
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:
影响因子:
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通讯作者:
C. Haag
中科院分区:
文献类型:
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作者:
M. Elsing;B. Schwering;T. Allmendinger;G. Barker;M. Feindt;C. Haag
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