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The littlest Higgs model with T-parity and some lepton flavor violation decay processes

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Science china(physics,Mechanics & Astronomy) 2010年第11期53卷 1968-1974页

作者： YUE ChongXing,MA Wei,ZHANG TingTing,LIU Wei & LIU JinYan department of physics,Liaoning normal University,Dalian 116029,china 1. department of physics Liaoning Normal University Dalian 116029 China

The new particles predicted by the littlest Higgs model with T-parity (called LHT model) can induce the lepton flavor violation (LFV) couplings at the one-loop level,which can add contributions to some LFV *** into account the constraints of the experimental data on the relevant free parameters,we calculate the branching ratios of the LFV decay processes Z → l ˉl and τ-→μ-P 1 P 2 with P 1 P 2 = π + π-,K + K-,and K0 ˉK 0 in the context of this new physics *** find that the LHT model can indeed make significant contributions to some of these LFV decay *** Z factory option for the future high energy e + e-collider experiments will give severe constraints on the LHT model.

关键词： littlest Higgs model lepton flavor violation branching ratios

Morphology and the M_(BH)-σ_* relation for NLS1s

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Science china(physics,Mechanics & Astronomy) 2010年第S1期53卷 256-258页

作者： BIAN WeiHao & HUANG Li department of physics and Institute of Theoretical physics,Nanjing normal University,Nanjing 210097,china 1. department of physics and Institute of Theoretical physics Nanjing Normal University Nanjing 210097 China

For a sample of 33 narrow-line Seyfert 1 galaxies(NLS1s)(z<0.1) from the Sloan Digital Sky Survey,we investigate their *** find that 24 NLS1s show clear bar structure and 9 NLS1s show no bar *** bar frequency in this NLS1s sample is about 70%.We do not find any difference in the location of NLS1s with or without bars on the MBH-σ* diagram.

关键词： active galaxies bar black hole mass

Dispersion of Soluble Matters in Newton-dipolar Stratified Fluid and Effects of Peripheral Layer

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Communications in Nonlinear Science and Numerical Simulation 1998年第4期3卷 236-241页

作者： Zhangji LU, Shousheng DONG, Yu SHEN and Guangping ZHENG (department of Mechanics and Engineering Science, Fudan University, Shanghai 200433,china)(department of physics, East china normal University, Shanghai 200062, china) Dept. of Mechanics and Eng. Science Fudan University Shanghai 200433 China department of physics East China Normal University Shanghai 200062 China

In the paper, the dispersion law and the concentration distributions of soluble matters in Newton-dipolar fluids flowing through a circular tube have been investigated. Main results are: (1) for the dependence of M on A (or H), the completely opposite trends are obtained in the cases with and without the peripheral layer. (2) effects of δ on　M have the minimum values near 8=0.85-0.9. (3) various models such as couple stress,micropolar, dipolar, Newton-newtonian, Newton-couple stress and Newton-micropolar　model etc. are all special cases of Newton-dipolar fluid (where Mz=0). WhenMz≠ 0,however, there are evident differences between the Newton-dipolar fluid and the Newtoncouple stress fluid, the Newton-micropolar fluid.

关键词： dipolar fluid dispersion effects of a peripheral layer tube flow of complex fluid

Further research on high-spin structure in ^(161)Lu

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Science china(physics,Mechanics & Astronomy) 2008年第3期51卷 315-320页

作者： LI YanXia1,2,YU ShaoYing1,2,4,SHEN CaiWan1,5,LI XiaoWei6 & CHEN YongShou3,4 1 School of Science,Huzhou Teachers college,Huzhou 313000,china 2 college of Mathematics,physics and Information Engineering,Zhejiang normal University,Jinhua 321000,china 3 china Institute of Atomic Energy,Beijing 102413,china 4 Institute of Theoretical physics,Chinese Academy of Sciences,Beijing 100080,china 5 Center of Theoretical Nuclear physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,china 6 department of physics,Chifeng University,Chifeng 024001,china School of Science Huzhou Teachers College Huzhou 313000 China college of Mathematics Physics Information Engineering Zhejiang Normal University Jinhua 321000 China china Institute of Atomic Energy Beijing 102413 China Institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China department of physics Chifeng University Chifeng 024001 China

The two-dimensional total routhian surface (TRS) calculations were performed to probe into the triaxial superdeformed characteristics of a strongly populated band X2 in 161Lu. This band was identified as a triaxial superdeformed band by using our TRS method. We also got its formation mechanics,i.e. the neutron-shell correction energy plays a crucial role,while the rotating energy and the deformation-driving effect of high j intruder orbit i13/2 also play an additional role.

关键词： TRS method triaxial superdeformation formation mechanism

Theory study of shapes in ^(187,189)Tl nuclei

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Science china(physics,Mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2,3, SHEN CaiWan1,5 & DONG YongSheng1,2,4 1 School of Science, Huzhou Teachers college, Huzhou 313000, china 2 School of Science and Information Engineering, Zhejiang normal University, Jinhua 321000, china 3 Institute of Theoretical physics, Chinese Academy of Sciences, Beijing 100080, china 4 department of physics, Jining Teachers college, Jining 012000, china 5 Center of Theoretical Nuclear physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china School of Science Huzhou Teachers College Huzhou 313000 China School of Science and Information Engineering Zhejiang Normal University Jinhua 321000 China Institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China department of physics Jining Teachers College Jining 012000 China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculations were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotation coexists with the high-K prolate rotation. Superdeformed prolate rotation is included in this calculation.

关键词： nuclear shape oblate rotation prolate rotation

Modulation on the collective response behavior by the system size in two-dimensional coupled cell systems

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Science china(physics,Mechanics & Astronomy) 2006年第3期49卷 304-312页

作者： ZHANG Jiqian1, SHEN Chuansheng1,2 & CUI Zhifeng1 1. college of physics and Electronic Information, Anhui normal University, Wuhu 241000, china 2. department of Educational Technology, Anqing Teachers college, Anqing 246011, china college of physics Electronic Information Anhui Normal University Wuhu 241000 China department of Educational Technology Anqing Teachers College Anqing 246011 China

By the intracellular calcium ionic minimal model proposed by Berridge, we investigated the collective response of two-dimensional (N×N) coupled cell systems to the external stimulation using numerical simulation methods. With a coupled intensity fixed and an appropriate coupled cell number chosen, the kinetic system size resonance was discovered. At the same time, it was found that the system size responding to the external stimulation for different coupled intensities transferred too, especially when the coupled intensity increased, the range of the corresponding system size extended. These phe- nomena illustrate that the coupled cell number and the coupled intensity can play con- structive roles in noisy coupled systems, by which the biology system would probably improve its capability to respond to the external stimulation.

关键词： cell coupling,collective response,system size resonance

k-Nearest Neighbors for automated classification of celestial objects

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Science china(physics,Mechanics & Astronomy) 2008年第7期51卷 916-922页

作者： LI LiLi1,2,3, ZHANG YanXia1 & ZHAO YongHeng1 1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, china 2 department of physics, Hebei normal University, Shijiazhuang 050016, china 3 Weishanlu Middle School, Tianjin 300222, china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. department of physics Hebei Normal University Shijiazhuang 050016 China 3. Weishanlu Middle School Tianjin 300222 China

The nearest neighbors (NNs) classifiers, especially the k-Nearest Neighbors (kNNs) algorithm, are among the simplest and yet most efficient classification rules and widely used in practice. It is a nonparametric method of pattern recognition. In this paper, k-Nearest Neighbors, one of the most commonly used machine learning methods, work in automatic classification of multi-wavelength astronomical objects. Through the experiment, we conclude that the running speed of the kNN classier is rather fast and the classification accuracy is up to 97.73%. As a result, it is efficient and applicable to discriminate active objects from stars and normal galaxies with this method. The classifiers trained by the kNN method can be used to solve the automated classification problem faced by astronomy and the virtual observatory (VO).

关键词： k-Nearest Neighbors data analysis classification astronomical catalogues

Constraints on Cardassian universe from Gamma ray bursts

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Science china(physics,Mechanics & Astronomy) 2010年第9期53卷 1720-1725页

作者： WANG TaiShan1 & LIANG Nan2 1 department of physics & Center for Astrophysics,Tsinghua University,Beijing 100084,china 2 department of Astronomy,Beijing normal University,Beijing 100875,china 1. department of physics & Center for Astrophysics Tsinghua University Beijing 100084 China2. Department of Astronomy Beijing Normal University Beijing 100875 China

Constraints on the original Cardassian model and the modified polytropic Cardassian model are examined from the recently derived 42 gamma-ray bursts(GRBs) data calibrated with the method that can avoid the circularity *** results show that GRBs can be an optional observation to constrain the Cardassian *** the GRBs data with the newly de-rived size of baryonic acoustic oscillation peak from the Sloan Digital Sky Survey(SDSS),and the position of the first acoustic peak of the Cosmic Microwave Background radiation(CMB) from Wilkinson Microwave Anisotropy Probe(WMAP),we find Ωm0=0.27+0.02-0.02,n=0.06+0.07-0.08(1σ) for the original Cardassian model,and Ωm0=0.27+0.23-0.02,n=-0.09+0.23-1.91,β=0.82+2.10-0.62(1σ) for the modified polytropic Cardassian model.

关键词： Cardassian Gamma ray burst Cosmic Microwave Background baryonic acoustic oscillation

Process e~-γ→e~-H in Littlest Higgs Model

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Communications in Theoretical physics 2006年第11期46卷 891-894页

作者： YUE Chong-Xing,~+ ZHANG Feng, YANG Shuo, and SUN Yah-Bin department of physics, Liaoning normal University, Dalian 116029, china department of physics Liaoning Normal University Dalian 116029 China

In the context of the littlest Higgs (LH) model, we estimatc the production cross section of the process e~-γ→e~-H in the future high-energy linear e~+e~- collider (IL C) with the center-of-mass (CM) energy S=500 *** numerical results show that the contributions of the LH model to this process are very small in most of the parameter space allowed by the electroweak precision measurement data, and are very difficult to be detected in the future ILC experiments.

关键词： littlest Higgs model Higgs boson high-energy linear e~+e~- collider