We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. ...We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. Our results show that the ETC effect on PtR is negligibly small which can be safely ignored, and the ETC effect on ALR may be testable at high energy e+e- linear collider (LC). For 0.03 ≤ε≤ 0.1, 500 GeV ≤ s ≤ 800 GeV, the relative correction of PtL is in the range of 15% ≤δPtL/PtL,SM ≤ 39%, which will certainly be detected at the LC experiments (for example TESLA).展开更多
In the framework of topcolor-assisted technicolor model we calculate the contributions from thc pseudoGoldstone bosons and new gauge bosons to e+e- → tt. We find that for reasonable ranges of the parameters, thepseud...In the framework of topcolor-assisted technicolor model we calculate the contributions from thc pseudoGoldstone bosons and new gauge bosons to e+e- → tt. We find that for reasonable ranges of the parameters, thepseudo Goldstone bosons afford dominate contribution, the correction arising from new gauge bosons is negligibly small,the maximum of the relative corrections is ～ 10% with the center-of-mass energy s ＝ 500 GeV; whereas in the cascof s ＝ 1500 GeV, the relative corrections could be up to 16%. Thus large new physics might be observablc at theexperiments of next-generation linear colliders.展开更多
We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a mor...We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a more abundant jet topology(n jets,n>4) Neural network have proven themselves to be more efficient classifier than the other techniques.The efficiencies and purities achieved with the optimized neural network are in average 1 to 7% higher than those obtaind with the other methods.展开更多
A Monte-Carlo Generator Photon Jets （MCGPJ） to simulate Bhabha scattering as well as production of two charged muons and two photons events is discussed. The theoretical precision of the cross sections with radiativ...A Monte-Carlo Generator Photon Jets （MCGPJ） to simulate Bhabha scattering as well as production of two charged muons and two photons events is discussed. The theoretical precision of the cross sections with radiative corrections （RC） is estimated to be smaller than 0.2%. The Next Leading Order （NLO） radiative corrections proportional to α are treated exactly, whereas the all logarithmically enhanced contributions, related to photon jets emitted in the collinear region, are taken into account in frame of the Structure Function approach. Numerous tests of the MCGPJ as well as a detailed comparison with other MC generators are presented.展开更多
We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for...We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for these processes are presented, and are used to extract the asymmetry parameters in e^＋e^-annihilation data. Base on the currentΛ＋c data set collected at BESIII, we estimate the experimental sensitivities to measure the parameters αΛπ＋forΛ＋c →Λπ＋, αΣ＋π0for Λc^＋ →Σ＋π^0 and αΣ0π＋for Λc^＋ →Σ^0π^＋.展开更多
文摘We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. Our results show that the ETC effect on PtR is negligibly small which can be safely ignored, and the ETC effect on ALR may be testable at high energy e+e- linear collider (LC). For 0.03 ≤ε≤ 0.1, 500 GeV ≤ s ≤ 800 GeV, the relative correction of PtL is in the range of 15% ≤δPtL/PtL,SM ≤ 39%, which will certainly be detected at the LC experiments (for example TESLA).
文摘In the framework of topcolor-assisted technicolor model we calculate the contributions from thc pseudoGoldstone bosons and new gauge bosons to e+e- → tt. We find that for reasonable ranges of the parameters, thepseudo Goldstone bosons afford dominate contribution, the correction arising from new gauge bosons is negligibly small,the maximum of the relative corrections is ～ 10% with the center-of-mass energy s ＝ 500 GeV; whereas in the cascof s ＝ 1500 GeV, the relative corrections could be up to 16%. Thus large new physics might be observablc at theexperiments of next-generation linear colliders.
基金The project supported in part by the Program for New Century Excellent Talents in Universities NCET-04-0290 and National Natural Science Foundation of China under Grant No, 10475037
文摘We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a more abundant jet topology(n jets,n>4) Neural network have proven themselves to be more efficient classifier than the other techniques.The efficiencies and purities achieved with the optimized neural network are in average 1 to 7% higher than those obtaind with the other methods.
基金Supported by INTAS Ref.Nr 05-1000008-8328,INTAS YSF Ref. Nr 06-1000014-6464the Slovak Grant Agency for Sciences VEGA,Grant Nr 2/7116/27
文摘A Monte-Carlo Generator Photon Jets （MCGPJ） to simulate Bhabha scattering as well as production of two charged muons and two photons events is discussed. The theoretical precision of the cross sections with radiative corrections （RC） is estimated to be smaller than 0.2%. The Next Leading Order （NLO） radiative corrections proportional to α are treated exactly, whereas the all logarithmically enhanced contributions, related to photon jets emitted in the collinear region, are taken into account in frame of the Structure Function approach. Numerous tests of the MCGPJ as well as a detailed comparison with other MC generators are presented.
基金Supported by National Natural Science Foundation of China(11375205,11175146,11275266,11235011,11425524,11505010,11565006)Beijing Municipal Government Foundation(KM201610017009,2015000020124G064)Youth Innovation Promotion Association of CAS
文摘We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for these processes are presented, and are used to extract the asymmetry parameters in e^＋e^-annihilation data. Base on the currentΛ＋c data set collected at BESIII, we estimate the experimental sensitivities to measure the parameters αΛπ＋forΛ＋c →Λπ＋, αΣ＋π0for Λc^＋ →Σ＋π^0 and αΣ0π＋for Λc^＋ →Σ^0π^＋.
