Bd0→φK0极化反常和Bd→φKS CP不对称的研究

在模型Ⅲ下, 仅考虑来自于中性规范玻色子H⁰, h⁰和 A⁰产生的树图阶味改变中性流的贡献, 并利用QCD因子化方法, 对B_d⁰→φK^*0衰变过程的极化反常和 B_d→φK_S衰变过程的CP不对称进行了研究, 经过计算发现, 在147<|λ_bsλ_ss|<165的参数范围内, 这两个过程中存在的反常现象能够同时给予解释.     

Bs,d → μ^μ^- decays in a flavor changing Z＇ model

We study the pure leptonic decays Bs,d → μ^μ^- in a Flavor Changing ZI Model. From the recent measurements of the branching ratios B（Bs,d → μ^μ^-）, we have derived the bounds on the effective μ-μ-Z＇ lepton coupling Bμμ^L. We find that, （i） if neglecting the contribution from the right-handed lepton coupling R L Bμμ^R, we obtain 1.32 〈 Bμμ^L 〈 3.32; （ii） if considering the contribution from the right-handed lepton coupling Bμμ^R and setting Bμμ^R and setting Bμμ^L= Bμμ^R, we obtain 0.99 〈 Bμμ^L 〈 2.19. Our results could be useful for researching Z＇ effects.     

一代人工色模型与单top产生q■→t■

计算了一代人工色模型（ＯＧＴＭ）中的赝标哥尔斯通玻色子（ＰＧＢｓ）对Ｔｅｖａｔｒｏｎ上ｑｑ＇→ｔｂ单ｔｏｐ产生的单圈修正．发现相对于树图水平的散射截面，它对单ｔｏｐ夸克产生单圈修正总的散射截面的最大修正可达－１５．３％，这在高亮度的Ｔｅｖａｔｒｏｎ下是可以观察到的．     

TC2模型下底夸克对产生的研究

在顶色辅助的technicolor模型下, 计算了来自赝标哥得斯通玻色子和新规范玻色子对e⁺e^－→bb的截面贡献. 发现由technipions和新规范玻色子产生截面的修正足够小以至于可以忽略, 在合理的参数范围内, top pions起主要作用, 在质心能量√s=500GeV, 修正的最大值可以达到43%; 在√s=1500GeV, 最大的相对修正却只有3.1%. 这为我们在下一代直线对撞机实验中探测顶色辅助的technicolor模型下(TC2模型)提供了可行的方法.     

OGTC模型中PGBs对γγ→bb过程的Yukawa修正

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.     

Associated production of a neutral top-Higgs with a heavy-quark pair in the γγ collisions at ILC

We have studied the associated production processes of a neutral top-Higgs in the topcolor assisted technicolor model with a pair of heavy quarks in γγ collisions at the International Linear Collider （ILC）. We find that the cross section for ttht in γγ collisions is at the level of a few fb with the c.m. energy √s=1000 GeV, which is consistent with the results of the cross section of ttH in the standard model and the cross section of tth in the minimal supersymmetric standard model. It should be clear that hundreds of to thousands of ht per year can be produced at the ILC. This process of γγ→ttht is really interesting in testing the standard model and searching the signs of technicolor.     

TOPCMTC模型中π~"非汉字符号"介子与W~±规范玻色子在LHC上的辅助产生(英文)

在顶色辅助多标度人工色 (TOPCMTC)模型下计算了大动量强子对撞机 (LHC)上π 介子与W± 规范玻色子辅助产生过程pp→b b→W±π 的产生截面 .发现这个产生截面与最小超对称模型下pp→b b→W±H 的相应结果大致相当 .在一定的参数范围内 ,这个过程的产生截面能够达到几十个甚至一百多个fb .W±π 的信息可能在LHC上被探测到 .     

Properties of the coupling constants of J/ψ→VP decays

Based on the branching fractions of J/ψ→VP from different experiments, we investigate the properties of the coupling constants of J/ψ→VP decays using a model-dependent approach. We find that the octet coupling constant, g8, of strong interaction is about twice larger than that of the singlet coupling constant g₁; the electromag- netic breaking parameters g_Eⁱ are larger than the mass breaking parameters g_Mⁱ, moreover, the three parameters of the electromagnetic effect are about equal, but the three parameters of the mass effect are obviously different and their uncertainties are also large; and the phase angle between strong and electromagnetic interactions is in the range of 70°-80°. It deepens our understanding of the coupling constant of J/ψ→VP decays.     

Analysis of Λb→pK- and pπ- decays in a flavor changing Z' mode

In this paper, we calculate the branching ratios of Λ_b→pK^- and pπ^- decays in the avor changing Z' model. We nd that the branching ratios for these two decay modes are sensitive to the contributions of the Z' boson. For Λ_b→pK^- decay, if the left-handed couplings are equal to the right-handed couplings, the branching ratio of this decay could match up to the currently experimental data for ξ_s=0.01 and -52°<φ_s^L<132°, or ξ_s=0.004 and 0°<φ_s^L<84°; if only the left-handed couplings are considered, it could match up to the experimental data for ξ_s=0.01 and -10°φ_s^L<138°. And for Λ_b→pK^- decay, if the left-handed and right-handed couplings are equal, the branching ratio of Λ_b→pK^- decay may be consistent with the currently experimental data with ξ_d=0.05 and -135°φ_d^L<43°, if only the left-handed couplings are considered, it may be consistent with ξ_d=0.05 and -114°φ_d^L<8°.