共查询到20条相似文献,搜索用时 156 毫秒
1.
计算了一代人工色(One Generation Technicolor,简称OGTC)模型中的赝标哥尔斯通玻色子(Pseudo-Goldstone Bosons,简称PGBs)对γγ→bb过程的Yukawa修正.发现在一定的参数范围内,PGBs对γγ→bb散射截面的修正超过10%;而PGBs对过程e+e-→γγ→bb的相对修正,在laser back-scattering photons模式下最大可达-51%,在beamstrahlung photons模式下最大只有-17.9%;这些修正比标准模型和超对称模型下相应粒子的贡献大许多,将为在下一代高能光子碰撞实验上寻找人工色理论的信息提供参考. 相似文献
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在顶色辅助的人工色模型下计算了高能e+e-对撞机上top介子辅助的b夸克对产生过程e+e-→bbπ0t的产生截面.发现在一定的参数范围内,这个过程的产生截面大于10fb,比标准模型下标量Higgs粒子辅助的b夸克对产生过程大许多,与最小超对称模型下标量和赝标量Higgs粒子h0,H0,A0的相应产生截面大致相当.人工色理论的信息可能在下一代正负电子对撞实验中探测到. 相似文献
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宇宙线超高能相互作用的QCD部分子模型产生器 总被引:1,自引:1,他引:0
在pQCD的部分子模型和独立碎裂方案的部分子强子化模型基础上,建立了用于超高能宇宙线与空气核相互作用的产生器.通过拟合PP散射和e+e-对撞实验数据来决定产生器中的参数.再现了从s=546GeV到1800GeVpp散射中喷注的产生和从s=14GeV到91GeV e+e-对撞等实验的基本特征,并外推到≤22TeV的超高能区. 相似文献
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We study an upper bound on masses of additional scalar bosons from the electroweak precision data and theoretical constraints such as perturbative unitarity and vacuum stability in the two-Higgs-doublet model taking account of recent Higgs boson search results. If the mass of the Standard-Model-like Higgs boson is rather heavy and is outside the allowed region by the electroweak precision data, such a discrepancy should be compensated by contributions from the additional scalar bosons. We show the upper bound on masses of the additional scalar bosons to be about 2 (1) TeV for the mass of the Standard-Model-like Higgs boson to be 240 (500) GeV. 相似文献
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A. Accioly S. Ragusa H. Blas H. Mukai 《International Journal of Theoretical Physics》2002,41(6):1019-1025
Massive particles of spin 0 and 1 violate the equivalence principle (EP) at the tree level. On the other hand, if these particles are massless, they agree with the EP, which leads us to conjecture that from a semiclassical viewpoint massless particles, no matter what their spin, obey the EP. General relativity predicts a deflection angle of 2.63 for a nonrelativistic spinless massive boson passing close to the Sun, while for a massive vectorial boson of spin 1 the corresponding deflection is 2.62. 相似文献
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In the framework of topcolor-assisted technicolor model we calculate the contributions from the preudo Goldstone bosons and new gauge bosons to e^ e^-→ttk.We find that for reasonable ranges of the parameters,the preudo 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=500GeV;whereas in the case of √s=1500 GeV,the relative corrections could be up to 16%.Thus large new physics might be observable at the experiments of next-generation linear colliders. 相似文献
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XIE Wen-Fang 《理论物理通讯》2005,44(3):529-531
A system of three charged bosons confined in a harmonic trap has been investigated by an exact diagonalization. We report a calculation for the energy spectrum of the low-lying states of a system of three charged bosons. The important feature of the low-lying states of three charged bosons in a harmonic trap is obtained via an analysis of the energy spectrum. 相似文献
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In this paper we investigate the effects of the large extra dimensions on the two processes
e+e-→
H0Z0Z0 and e+e-→ H0Z0Z0 at linear colliders in both unpolarized and polarized collision modes. We
find that the virtual Kaluza-Klein graviton exchange can significantly enhance the cross section from their standard model expectations for these two processes. The results show that the
LED effect on the process
e+e-→
H0Z0Z0
allows the observation limits on
the effective scale MS to be probed up to 9.75 TeV and 10.1 TeV
in the unpolarized and
+-(λe+=1/2,
λe-=-1/2) polarized beam collision modes (with
Pe+=0.6,
Pe-=0.8), respectively. For the process
e+e-→
H0Z0Z0, these limits on MS can be
probed up to 6.06 TeV and 6.38 TeV in the unpolarized and polarized
collision modes separately. We find that the λe+=1/2,
λe-=-1/2 polarization collision mode in both
process e+e-→ H0Z0Z0 and e+e-→ H0Z0Z0
may provide a possibility to improve the
sensitivity in probing the LED effects. 相似文献
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XIE Wen-Fang 《理论物理通讯》2006,46(3):538-540
A system of three bosons trapped by a parabolic confinement and interacting with a short-ranged interaction has been investigated by the exact diagonafization of the Hamiltonian matrix. We report a calculation for the energy spectrum of the low-lying states of a system of three interacting bosons. The important feature of the low-lying states of three interacting bosons trapped by a parabolic confinement is obtained via an analysis of the energy spectrum. 相似文献
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P. Van Isacker 《Frontiers of Physics》2018,13(6):132107
This contribution reviews the symmetry properties of the interacting boson model of Arima and Iachello. While the concept of a dynamical symmetry is by now a familiar one, this is not necessarily so for the extended notions of partial dynamical symmetry and quasi dynamical symmetry, which can be beautifully illustrated in the context of the interacting boson model. The main conclusion of the analysis is that dynamical symmetries are scarce while their partial and quasi extensions are ubiquitous. 相似文献
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XIE Wen-Fang 《理论物理通讯》2006,46(9)
A system of three bosons trapped by a parabolic confinement and interacting with a short-ranged interaction has been investigated by the exact diagonalization of the Hamiltonian matrix. We report a calculation for the energy spectrum of the low-lying states of a system of three interacting bosons. The important feature of the low-lying states of three interacting bosons trapped by a parabolic confinement is obtained via an analysis of the energy spectrum. 相似文献
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In this work, we analyze the positive parity of states of odd-A Eu isotopes within the framework of interacting boson fermion model (IBFM-1). The result of an IBFM-1 multilevel calculation with the 3s1/2, 2d3/2, 2d5/2, and 1g7/2 single panicle orbits is reported for the positive parity states of the odd-A Eu isotopes. A/so, an IBM-1 calculation is presented for the low-lying states in the even-even 152-154Sm core nucleus. The energy levels and B(E2) transition probabilities are calculated and compared with the experimental data. It is found that the calculated positive parity low spin state energy spectra of the odd-A Eu isotopes agree quite well with the experimental data. 相似文献
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XIE Wen-Fang 《理论物理通讯》2005,44(9)
A system of three charged bosons confined in a harmonic trap has been investigated by an exact diagonalization. We report a calculation for the energy spectrum of the low-lying states of a system of three charged bosons.The important feature of the low-lying states of three charged bosons in a harmonic trap is obtained via an analysis of the energy spectrum. 相似文献