云南宇宙射线站奇特事例的再分析

1972年云南宇宙射线站观测到的奇特事例有可能是1个高能重粒子和核子碰撞,产生3个带电粒子,其中有1个带单位正电荷的长寿命重粒子C⁺,如果碰撞后没有未被记录到的中性粒子,则C⁺的性质为:质量M₊>43GeV;寿命i>0.406×10^-9s.如果它不稳定,则应可以通过弱相互作用衰变到一个比它略轻的重中粒子C⁰和1对轻子,C⁺和C⁰的质量差小于0.270GeV.这个奇特事例可能来自冷暗物质宇宙线粒子和核子的碰撞.     

Technicolor理论中的赝标格尔斯通粒子对t─→W+b过程所产生的虚效应

计算了Technicolor理论中的赝标格尔斯通粒子对t→W+b过程的单圈贡献,并讨论了这种贡献对t夸克和赝标格尔斯通粒子质量的依赖性.可以得出:当mt在100—200GeV之间变化时,总的Technicolor单圈贡献从0.6%变到-2.0%.     

46．7MeV／A~（12）C轰击~（159）Tb、~（197）Au和~（209

用４６．７ＭｅＶ／Ａ１２Ｃ轰击１５９Ｔｂ、１９７Ａｕ和２０９Ｂｉ，测量关联裂片的速度和角度．研究了线动量转移、质量和出平面角分布，提取了核温度．应用级联两体统计衰变理论进行了拟合与解释，结果表明：在入射能约为５０ＭｅＶ／Ａ的中能重离子碰撞中，以非完全熔合方式形成了核温度高达４－５ＭｅＶ的类复合核，其后通过裂变、蒸发级联统计两体衰变而退激．     

用微扰QCD方法研究B(s)→Φρ衰变

用微扰QCD对B(s)→Φρ衰变进行了研究,考虑了因子化和非因子化图的贡献,得出了B(s)→Φρ衰变的分支比以及纵向极化衰变、横向极化衰变之比,所得到的结果与现在的实验数据吻合.     

Radiative Decays of （0^＋, 1^＋） Strange-Bottom Mesons

In this article, we assume that the （0^＋,1^＋） strange-bottom mesons are the conventional bs mesons, and calculate the electromagnetic coupling constants d, g1, g2, and g3 using the light-cone QGD sum rules. Then we study the radiative decays Bs0→Bs^＊γ, Bs1→Bsγ, Bs1→Bs^＊γ, and Bs1→Bs0γ, and observe that the widths are rather narrow. We can search for the （0^＋, 1^＋） strange-bottom mesons in the invariant Bsπ^0 and Bs^＊π^0 mass distributions in the strong decays or in the invariant Bs^＊γ, and Bsγ mass distributions in the radiative decays.     

Analysis on B → VV with the Flavour SU（3） Symmetry

It is noted that the rescattering and annihilation effects are significant in the penguin-dominant B→ VV decays. In this work, we suggest to use a unique operator at the quark level to describe all the rescattering and the penguin-induced annihilation effects in B→ φK^＊, and the coefficient of the operator depends on the polarizations of the produced mesons. By the flavour SU（3） symmetry, we apply the same scenario to all the penguin-dominant B0190 VV modes.     

新同位素175Er

简介首次合成新核素１７5Ｅｒ及对其衰变纲图测定的实验方法和实验结果． the synthesis and γ decay scheme of new isotope175Er is reported for the first time.The related experimental process and main results are represented briefly also.     

利用波函数研究Bc介子纯轻衰变的QCD非微扰特性

B_c介子辐射性纯轻衰变的理论计算具有很大的强子型不确定性。利用3种类型的B_c介子波函数描述这种纯轻衰变的QCD非微扰特性, 并通过控制函数中参数的变化在理论上详细地计算了由介子波函数而引起的B_c介子辐射性纯轻衰变的这种强子型的不确定性。 结果表明,介子波函数的形式对计算的衰变结果有非常明显的影响, 该过程的分支比可在1.819 81×10-5～3.189 61×10-5间变化。 The radiative and pure leptonic decays of B_cmesons are of hadrons uncertainty in theoretical calculations. Using three types of the B_c meson wave functions which describe the characteristics of the QCD non perturbative and by controlling the parameters in them, the uncertainties of B_c meson decay caused by the hadron decay model are studied in detail. The theoretical results show the branching ratios are (1.819 81~3.189 61)×10-5, which are sensitive to the type of wave functions.