We study a classical 1-dimenslonal kicked billiard model and investigate its transport behavior. The roles played by the two system parameters a and K, governing the direction and strength of the kick, respectively, a...We study a classical 1-dimenslonal kicked billiard model and investigate its transport behavior. The roles played by the two system parameters a and K, governing the direction and strength of the kick, respectively, are found to be quite crucial. For the perturbations which are not strong, i.e. K<1, we find that as the phase parameter α changes within its range of interest from -π/2 to π/2, the phase space is in turn characterized by the structure of a prevalently connected stochastic web (-π/2 ≤α<0), local stochastic webs surrounded by a stochastic sea(0<α<α/2 ) and the global stochastic sea (α=π/2). Extensive numerical investigations also indicate that the system's transport behavior in the irregular regions of the phase space for K<1 has a dependence on the system parameters and the transport coetticient D can be expressed as D≈D0(α)Kf(α).For strong kicks, i.e. K >1, the phase space is occupied by the stochastic sea, and the transport behavior of the system seems to be similar to that of the kicked rotor and independent of α.展开更多
Single W boson production is analyzed in a data sample collected by L3 detector at Large Electron Positron Collider in 1998.The integrated luminosity is 176.4pb^(-1)with center-of-mass energy at√s=189GeV.The signal c...Single W boson production is analyzed in a data sample collected by L3 detector at Large Electron Positron Collider in 1998.The integrated luminosity is 176.4pb^(-1)with center-of-mass energy at√s=189GeV.The signal consists of large missing energy final states with a single energetic lepton or two hadronic jets.The total cross section of single W production is measured to be 0.58±0.13±0.04 pb,in good agreement with standard model prediction.From this measurement,the limits on the anomalousγWW triple-gauge-boson couplings are derived at 95%confidence level:-0.48<△_(kr)<0.38 and-0.50<λ_(γ)<0.41.展开更多
The structure functions in theτ→3πv decay are extracted using the model proposed by Li.The predictions of Li model are compared with KS ones and the data from OPAL experiment.It is found that predictions by the mod...The structure functions in theτ→3πv decay are extracted using the model proposed by Li.The predictions of Li model are compared with KS ones and the data from OPAL experiment.It is found that predictions by the model forωA(Q2)are consistent with the data except for in the high energy region(Q2>1.2 GeV2),andωC,ωD,ωE normalized toωA are in reasonable agreement with the experimental results.Correction factors to the Breit-Wigner distribution of a1 and the Lagrangian of this decay are proposed to the model.展开更多
基金Supported in part by the National Climbing Program(Non-linear Science)of China.
文摘We study a classical 1-dimenslonal kicked billiard model and investigate its transport behavior. The roles played by the two system parameters a and K, governing the direction and strength of the kick, respectively, are found to be quite crucial. For the perturbations which are not strong, i.e. K<1, we find that as the phase parameter α changes within its range of interest from -π/2 to π/2, the phase space is in turn characterized by the structure of a prevalently connected stochastic web (-π/2 ≤α<0), local stochastic webs surrounded by a stochastic sea(0<α<α/2 ) and the global stochastic sea (α=π/2). Extensive numerical investigations also indicate that the system's transport behavior in the irregular regions of the phase space for K<1 has a dependence on the system parameters and the transport coetticient D can be expressed as D≈D0(α)Kf(α).For strong kicks, i.e. K >1, the phase space is occupied by the stochastic sea, and the transport behavior of the system seems to be similar to that of the kicked rotor and independent of α.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19675047 and 19555003,and Swiss Federal Institute of Technology(ETH,Zurich).
文摘Single W boson production is analyzed in a data sample collected by L3 detector at Large Electron Positron Collider in 1998.The integrated luminosity is 176.4pb^(-1)with center-of-mass energy at√s=189GeV.The signal consists of large missing energy final states with a single energetic lepton or two hadronic jets.The total cross section of single W production is measured to be 0.58±0.13±0.04 pb,in good agreement with standard model prediction.From this measurement,the limits on the anomalousγWW triple-gauge-boson couplings are derived at 95%confidence level:-0.48<△_(kr)<0.38 and-0.50<λ_(γ)<0.41.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19755001,19555003,and 19675047.
文摘The structure functions in theτ→3πv decay are extracted using the model proposed by Li.The predictions of Li model are compared with KS ones and the data from OPAL experiment.It is found that predictions by the model forωA(Q2)are consistent with the data except for in the high energy region(Q2>1.2 GeV2),andωC,ωD,ωE normalized toωA are in reasonable agreement with the experimental results.Correction factors to the Breit-Wigner distribution of a1 and the Lagrangian of this decay are proposed to the model.
