首页> 外文学位 >A search for the rare leptonic B decay B- meson decays to tau(-) tau antineutrino recoiling against B+ meson decays to neutral resonant anti D charged lepton, lepton neutrino.

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A search for the rare leptonic B decay B- meson decays to tau(-) tau antineutrino recoiling against B+ meson decays to neutral resonant anti D charged lepton, lepton neutrino.

机译：寻找稀有的轻子B衰变B-介子衰变为tau（-）tau反中微子，反抗B +介子的衰变成中性共振反D带电轻子，轻子中微子。

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This thesis describes a search for the decay B - → tau-nutau in 231.8 x 106 Upsilon(4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B+ → D¯ *0ℓ+nuℓ) is selected, and in the recoil a search for B- → tau -nutau signal is performed in the following tau decay modes: tau- → e -nuenu tau, tau- → mu-nu munutau, tau- → pi -nutau, tau- → pi-pi 0nutau, and tau- → pi -pi+pi-nutau. We find no evidence of signal, and we set a preliminary upper limit on the branching fraction of B (B- → tau- nutau) 2.8 x 10-4 at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B- → tau -nutau to give a combined preliminary limit of B (B- → tau- nutau) 2.6 x 10-4 at 90% CL.

机译：本文描述了在SLAC PEP-II B工厂用BABAR检测器记录的231.8 x 106 Upsilon（4S）衰变中对衰变B-→tau-nutau的搜索。选择具有一个重构的半轻子B衰变（B +→D¯* 0＆ell; + nu＆ell;）的事件样本，并在反冲中以以下tau衰变模式搜索B-→tau-nutau信号。：tau-→e -nuenu tau，tau-→mu-nu munutau，tau-→pi -nutau，tau-→pi-pi 0nutau，和tau-→pi -pi + pi-nutau。我们没有发现信号的迹象，我们在90％的置信度（CL）下设置了B（B-→taunutau）<2.8 x 10-4的分支分数的初步上限。然后，将该结果与统计独立的BABAR搜索结合起来，得出B-→tau-nutau，得出90％CL时B的组合初始极限（B-→tau-nutau）<2.6 x 10-4。

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作者
Datta, Mousumi.;
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作者单位

The University of Wisconsin - Madison.;

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授予单位 The University of Wisconsin - Madison.;
学科 Physics Elementary Particles and High Energy.
学位 Ph.D.
年度 2005
页码 195 p.
总页数 195
原文格式 PDF
正文语种 eng
中图分类高能物理学;
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A search for the rare leptonic B decay B- meson decays to tau(-) tau antineutrino recoiling against B+ meson decays to neutral resonant anti D charged lepton, lepton neutrino.

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