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The lepton flavor violating signal of the extra gauge boson z′in photon-photon collision at the ILC

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 1992-1997页

作者： LIU GuoLi 1,2 1 Physics Department,zhengzhou University,zhengzhou 450001,China 2 Kavli Institute for Theoretical Physics China,Chinese Academy of Sciences,Beijing 100190,China Physics Department Zhengzhou University Zhengzhou China Kavli Institute for Theoretical Physics China Chinese Academy of Sciences Beijing China

The hitherto unconstrained lepton flavor mixings,induced by the new gauge boson z ,which are the prediction of many new physics models,such as topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models,may lead to the lepton flavor violating productions of τμˉ,τeˉ and μeˉ in photon-photon collision at the proposed International Linear Collider (ILC).Through a comparative analysis of these processes,we find that the better channel to probe the new physics models is the production of τμˉ or τeˉ which occurs at a much higher rate than μeˉ production due to the large mixing angle and the large flavor changing coupling,and may reach the detectable level of the ILC for a large part of the parameter *** the rates predicted by the Standard Model are far below the detectable level,these processes may serve as a sensitive probe for such new physics models.

关键词： new gauge boson z lepton flavor violating processes photon-photon

Muon-pair production in the left-right symmetric model at a z^0-factory

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 1975-1980页

作者： MAHFOUDH A B Department of Modern Physics University of Science and Technology of China

The potential for probing the impacts of the left-right symmetric model (LRM) on the process e + e-→μ + μ-at a proposed z 0-factory is *** different electron-positron polarization collision modes,we calculate and compare the deviations of various observables in the framework of the LRM from the standard model (SM) predictions,such as the total cross section,the distribution of the transverse momentum of μ-,and the forward-backward charge asymmetry of μ-.In addition,we present the relations between the observables and the LRM *** conclude that it is possible to observe the effects of the LRM on the process e + e-→μ + μ-by using optimal observables and favorable parameters at a z 0-factory.

关键词： z 0 -factory electron-positron collider μ-pair production the left-right symmetric model

Effects of the littlest Higgs model on the process e^+ e^- → μ^+ μ^- at a z^0-factory

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 1961-1967页

作者： Wei Sun WenGan Ma RenYou zhang Lei Guo Yi Jiang Liang Han Department of Modern Physics University of Science and Technology of China (USTC) Hefei China

We investigate the possibilities of finding the effects of the littlest Higgs (LH) model on the process e + e - →μ + μ - at the leadingorder at a possible z *** study the impacts of the LH model on the observables,such as,the total cross section,the distribution of the transverse momentum of μ-,and the forward-backward charge asymmetry of μin polarized and unpolarized electron-positron collision ***,we analyze the relations between the observables and the LH model parameters,and discuss the observables of process e + e→μ + μ-in different incoming electron-positron polarization *** conclude that one could observe the effects contributed by the LH model on the process e + e-→μ + μin a reasonable parameter space,or might put more stringent constraints on the LH parameters in the future experiments at the possible z 0-factory.

关键词： z 0 -factory electron-positron collider μ-pair production the littlest Higgs model

Angular distribution coefficients of z(W) boson produced in e^+e^- collisions at s^(1/2) = 240 GeV

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Chinese Physics C 2019年第4期43卷 54-62页

作者： Yu-Dong Wang Jian-Xiong Wang Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

At the designed circular electron-positron collider(CEPC), similar to the hadron collider, the angular distribution coefficients of the decay lepton pair from the produced z(W) boson in e^+e^- collisions are predicted. Their dependence on cosθz(cosθW) are presented in four different polarization frames. Furthermore, the value of the angular distribution coefficients in different bins of cosθz are presented in the C-S frame. In comparison with the case at the hadron collider, better accurate measurement for z(W) is expected because there is less background, and W could be reconstructed from its leptonic decay channel. This works provides a method to precisely test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC.

关键词： Drell-Yan process z boson CEPC angular distribution coefficients

Study of D^0-D^0 mixing at a giga-z linear collider

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 1953-1956页

作者： LI HaiBo 1 & YANG Maozhi 2 1 Institute of High Energy Physics,P.O.Box 918,Beijing 100049,China 2 School of Physics,Nankai University,Tianjin 300071,China Institute of High Energy Physics Beijing China School of Physics Nankai University Tianjin China

The possibility of studying D 0-D 0 mixing at a giga-z linear collider "z factory" where 10 9 hadronic z 0 decays can be accumulated is *** discuss the sensitivity for the measurements of neutral D mixing *** results are compared to those attainable at B *** find that the typical decay length of the neutral D mesons at z factory is about 10 times larger than that at B *** addition,the resolution of the vertex detector of a giga-z factory is 2-3 times better than that of B *** proper time resolution at z factory is about 20-30 times better than that at B *** the determination of the mixing parameters at a giga-z factory is more precise.

关键词： z factory D0 mesons mixing B factory

z-ajoene induces tumor cells to die by apoptosis

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Chinese Science Bulletin 1998年第13期43卷 1135-1140页

作者： Dexian zheng Siqing zhang Song zhao Jimei Min Kui Wang Shilian Liu Chinese Acad Med Sci Inst Basic Med Sci State Key Lab Med Mol Biol New York NY 10005 USA Peking Union Med Coll New York NY 10005 USA Beijing Med Univ State Key Lab Nat & Biomimet Drugs Beijing 100083 Peoples R China Chinese Acad Med Sci Inst Hematol State Key Lab Expt Hematol Tianjin 300020 Peoples R China Peking Union Med Coll Tianjin 300020 Peoples R China

To unravel the pharmacological actions of garlic, a simple thiocompound, zajoene, was purified from the fresh cloves. Three tumor cell lines were subjected to treatment with zajoene at different concentrations in vitro and the morphological changes, DNA content of the cells and chromosome DNA fragmentation were observed by light microscopy, flow cytometry and agarose gel electrophoresis respectively. It was found that zajoene induced cell death by apoptosis in human HL60 promyelocytic leukemia cells, MGc803 gastric mucoid adenocarcinoma cells and Molt4 T lymphocyte leukemia cells. Western blot assay showed that z ajoene inhibited protooncogene bcl2 expression in the three different kinds of tumor cells, suggesting that zajoene may be a potential agent for tumor chemotherapy.

关键词： apoptosis of tumor cells z ajoene gene expression of bcl2.

Application of Improved z-Buffer Technique to RCS Computation

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Wuhan University Journal of Natural Sciences 1998年第1期3卷 53-55页

作者： Cao Qinfeng, Xu Penggen(College of Electronic Information, Wuhan University, Wuhan 430072, China) College of Electronic Information Wuhan University Wuhan China

This paper presents a new method for computation of the monostatic radar cross section (RCS) of electrically large conducting objects. Compared with the traditional z-buffer technique, the improved one can record not only the illuminated surface of the body, but also the information about the shadowed part. So multi-scattering and RCS of cavity can be calculated. The second advantage of it is using dual representation, of the target's facet surface, in which the illuminated part is treated as bicubic patches for RCS calculation, and is simplified to flat facet when ray tracing is done. Excellent agreement with the experiment has been obtained.

关键词： Key words RCS complex target z buffer EM scattering

一种应用于轨道交通的z型三相结构无接触供电系统

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电工技术学报 2018年第A1期33卷 105-111页

作者：张发聪史黎明殷正刚范满义姜龙斌中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所) 北京100190 中国科学院大学北京100049

提出一种适用于轨道交通无接触供电(WPT)系统的新型松耦合变压器结构,沿轨道敷设的一次侧发射线圈是一种三相z型结构,首先分析了一次侧和二次侧线圈的电磁耦合作用,得到一次侧和二次侧线圈的等效互感,计算了互感模型下二次侧线圈映射到... 详细信息

提出一种适用于轨道交通无接触供电(WPT)系统的新型松耦合变压器结构,沿轨道敷设的一次侧发射线圈是一种三相z型结构,首先分析了一次侧和二次侧线圈的电磁耦合作用,得到一次侧和二次侧线圈的等效互感,计算了互感模型下二次侧线圈映射到一次侧的等效阻抗。在Maxwell中搭建了三相松耦合变压器模型,得到了一次侧线圈的电磁参数,利用PSIM分析了系统功率输出特性。结果表明提出的z型三相松耦合变压器结构具有电磁耦合性能好、空间容错性强和系统阻抗对称的特点。

关键词：无接触供电系统 z 型三相松耦合变压器等效互感等效阻抗

Quasi-z源逆变器纹波自注入APF及其控制策略

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电机与控制学报 2019年第10期23卷 77-84页

作者：李志勇王思君陈有根中南大学自动化学院

单相Quasi-z源逆变器交流侧二倍基波频率(二倍频)的功率脉动会使其直流侧不可避免的出现二次纹波。针对单相Quasi-z逆变器直流侧电感二倍频电流纹波问题提出了一种自注入APF控制策略。运用状态空间平均法研究二倍频能量的传递机理,结合Q... 详细信息

单相Quasi-z源逆变器交流侧二倍基波频率(二倍频)的功率脉动会使其直流侧不可避免的出现二次纹波。针对单相Quasi-z逆变器直流侧电感二倍频电流纹波问题提出了一种自注入APF控制策略。运用状态空间平均法研究二倍频能量的传递机理,结合Quasi-z源网络小信号模型,发现占空比扰动可以影响Quasi-z源网络能量分布。在直通占空比上叠加补偿信号,在不改变电路拓扑结构的前提下,利用Quasi-z源网络向逆变桥自注入二倍频能量,抑制Quasi-z源网络输入功率波动。仿真验证了所提控制策略的有效性,Quasi-z源网络输入电流纹波幅值降低了 81.4%,并结合反馈控制方法对所提控制的响应速度进行了仿真对比分析。

关键词： Quasi z 源逆变器纹波传递机理自注入