非定域位势e-μr/r·e-μr′/r′·e-αR/R及e-μr/r·e-μr′/r′·e(-(β(r+r′))1/2·R))/R的Regge渐近行为

本文证明了两个物理上有兴趣的非定域位势e^-μr/r·e^-μr′/r′·e^-αR/R及e^-μr/r·e^-μr′/r′·e^{(-(β(r+r′))1/2·R)})/R的分波S矩阵元对动量变数k在除沿虚轴的割线(-∞i,0),(μi,∞i)的全平面,对角动量变数λ在右半平面Reλ>-1/2的半纯性和当k,λ分别趋于无穷大时的渐近性质。最后得到了Regge渐近行为。     

真实谱_0e~(-K(αb_1+b_2-αb_2))与杂化谱α_0e~(-Kb_1)+(1-α)_0e~(-Kb_2)匹配条件

α(0≤α≥1)取值不同,真实谱αb0e-K(αb1+b2-α)2对应厚度不同。0e-Kb1和0e-Kb2已知情况下,每一α值对应一杂化谱(α-0e-Kb1+(1-α)0e-Kb2。如果0e-Kαb1+b2-αb)2≈α0eKb1+(1-α)0e-Kb2,则只需选择合适的α,就可以得到期望的真实谱αb0e-K(1+b2-αb)2,而不需要制备厚度为b(b=b2-αb2+αb1)的样品。杂化谱与真实谱高度匹配的条件与Kb2数值和b1/b2比值有关。b1越接近b2,真实谱与杂化谱匹配越好;Kb2越小,真实谱与杂化谱匹配越好。     

Study of the process e~+e~- →π~+π~-π~0π~0 at energies s～(1/2)<1 GeV

In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e+e-→π+π-π0π0 was measured.At energies s～(1/2)920 MeV this cross section was measured for the first time.The energy dependence of the cross section is well discribed by the vector dominance model with contributions from ρ,ρ,ρ mesons.The decay probability ρ→π+π-π0π0 was found to be Bρ =(1.60±0.74±0.18)×10-5.The upper limit for the decay ω→π+π-π0π0 was improved by two orders of magnitude compared to the previous measurements and is Bω 2×10-4 at 90% confidence level.     

介子的零点波函数和π_(μ2),K_(μ2)及1~-→e~ e~-衰变过程

本文基于文献[1]中提出的介子波函数与原始的层子弱流和层子电磁流,利用Bethe-Salpeter方程(以下简称B-S方程),尝试对0~-和1~-介子的零点波函数进行了讨论。文中给出了0~-,1~-介子的零点波函数与质量的关系:x_2(0)=A(1 bm),其中A,b是与质量无关的参数,m是相应介子的物理质量。这样一种函数形式可以解释π_(μ2),K_(μ2)和1~-→e~ e~-过程的几率。     

Categorization of two-loop Feynman diagrams in the O(α~2) correction to e~+e~-→ ZH

The e~+e~-→ZH process is the dominant process for the Higgs boson production at the future Higgs factory.In order to match the analysis on the Higgs properties with highly precise experiment data,it will be crucial to include the theoretical prediction to the full next-to-next-to-leading order electroweak effect in the production rateσ(e~+e~-→ZH).In this inspiring work,we categorize the two-loop Feynman diagrams of the O(α~2) correction to e~+e~-ZH into 6 categories according to relevant topological structures.Although 25377 diagrams contribute to the O(a~2) correction in total,the number of the most challenging diagrams with seven denominators is 2250,which contain only 3 12 non-planar diagrams with 155 independent types.This categorization could be a valuable reference for the complete calculation in future.     

O(α_sv~2) correction to J/ψ plus η_c production in e~+e~- annihilation at s~(1/2)=10.6 GeV

Based on the nonrelativistic QCD factorization approach, O(αsv2) corrections to J/ψ plus ηc production in e+e-annihilation at √ s=10.6 GeV are calculated in this work. The numerical results show that the correction at αsv2order is only about a few percent of the total theoretical result. This indicates that the perturbative expansions become convergent and that a higher order correction will be smaller. The uncertainties from the long-distance matrix elements, renormalization scale and the measurement in the experiment are also discussed. Our result is in agreement with the previous result by Jia.     

Measurements of decay branching fractions of H→b■/c■/gg in associated (e~+e~-/μ~+μ~-)H production at the CEPC

The high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider(CEPC).The measurements ofH→b■/c■/gg decay branching fraction in the CEPC experiment is presented,considering a scenario of analysing 5000 fb-1 e~+e~-collision data with the center-of-mass energy of 250 Ge V.In this study the Higgs bosons are produced in association with a pair of leptons,dominantly mediated by the ZH production process.The statistical uncertainty of the signal cross section is estimated to be about 1%in theH→b■ final state,and approximately 5%-10%in theH→c■/gg final states.In addition,the main sources of the systematic uncertainties and their impacts to the measurements of branching fractions are discussed.This study demonstrates the potential of precise measurement of the hadronic final states of the Higgs boson decay at the CEPC,and will provide key information to understand the Yukawa couplings between the Higgs boson and quarks,which are predicted to be the origin of quarks’masses in the standard model.     

合成抗孕酮新药RU-486中间体3,3-乙撑二氧-5α,10α及5β,10β-环氧-Δ~(9(11))-雌烯-17α(1-丙炔基)-17β-羟基的~1H和~(13)C NMR谱线全归属

用１Ｄ及２ＤＮＭＲ技术（ＣＯＳＹ，ＴＯＣＳＹ，ＨＭＱＣ及ＨＭＢＣ）归属了合成抗孕酮新药ＲＵ－４８６中间体３，３乙撑二氧５α，１０α及５β，１０β环氧－Δ９（１１），雌烯１７α（１－丙炔基）１７β羟基的１Ｈ和１３ＣＮＭＲ谱线．     

~(206)At的[лh_(1/2)vi_(13/2)~(-1)]10~-同质异能态研究(英文)

利用能量为６０－８０ＭｅＶ的~(１２)Ｃ束流,通过~１９７Ａｎ（~(１２)Ｃ,３ｎ）~２０６Ａｔ反应研究了~２０６Ａｔ核的高自旋能级结构．用７台ＢＧＯ（ＡＣ）ＨＰＧｅ探测器和一台用于探测低能γ射线的平面型ＨＰＧｅ探测器进行了γ射线的激发函数、γ－γ－ｔ符合及γ射线的角分布测量．基于这些测量,首次建立了包括２５条γ跃迁的~２０６Ａｔ高自旋能级纲图．确定了一个半寿命为（９０８±４００）ｎｓ、自旋和宇称为１０的同质异能态．基于较重的双奇核~(２０８,２１０ )Ａｔ能级结构的系统性,对~(２０６)Ａｔ的１０~－同质异能态进行了讨论．     

Cu(100)(2~(1/2)×22~(1/2))R45°-O的表面结构与电子态的密度泛函研究

用第一性原理的总能计算研究了Cu(100))面的表面结构、弛豫以及氧原子的(2×22)吸附状态.计算给出了Cu(100)(2×22)R45°-O吸附表面的结构参数,并得到了上述结构下氧吸附的Cu(100)表面氧原子和各层Cu原子的电子态密度.计算得到的吸附表面功函数为4.58eV,与清洁Cu(100)表面功函数(~4.53eV)几乎相同.吸附氧原子与最外层铜原子之间的垂直距离约为0.02nm,其能带结构体现出一定的金属性,同时由于Cu-O的杂化作用在费米能以下约6.4eV附近出现了局域的表面态.可以认为,在Cu(100)(2×22)R45°的氧吸附表面结构下,吸附氧原子和衬底之间的结合主要来源于表面最外层铜原子与氧原子的相互作用.     

CS_2~+经由~2Σ_u~+←~2Π_(g,3/2)跃迁的[1+1]光倒空和光碎片激发谱(英文)

用483.2nm的电离激光使CS2分子经由[3+1]REMPI制备出CS2+(X~2Πg,3/2)后,在270~285nm扫描解离激光获得了CS2+经由~B2Σu+←X~2Πg,3/2跃迁的光倒空和光碎片激发谱,由此给出了CS2+~B2Σu+电子态的振动频率ν1=613cm-1和2ν2=707cm-1.分析表明,正是CS2+的[1+1]双光子光激发解离过程导致了母体离子CS2+的光倒空和光解离成碎片离子CS+和S+,该过程中光碎片离子的分支比CS+/S+大约为3.     

应用~(15)N-~1H残留偶极偶合验证刪除肝癌2(DLC2-SAM)不育-α-基序域的螺旋间的取向(英文)

刪除肝癌2(DLC2),一种经常发现在原发性肝癌过低表达的肿瘤抑制基因,编码一种含有不育-α-基序多域蛋白质(DLC2-SAM).以前SAM域蛋白(DLC2-SAM)核磁共振结构显示此蛋白是由独特的四螺旋束组成,与其它已知SAM域结构截然不同.在该研究中,作者运用了15N-1H残留偶极偶合(RDC)作为附加约束连同NOE和TA-LOS数据进一步优化了DLC2-SAM的结构.由此所得的结构与没有15N-1H残留偶极偶合约束比较显示改善了结构的质量并且有较低的Q值.螺旋的取向,尤其是螺旋4,被残留偶极偶合数据所验证.RDC-优化的人类DLC2-SAM的结构与小鼠的DLC2-SAM很相像.DLC家庭独特的SAM域结构表明该域可能还具有没被发现的新功能.     

Evidence for a new resonance Σ~* (1380) with J~P=1/2~(-*)

A new particle Σ * with J P = 1/2-was predicted by unquenched quark models with its mass around the well established Σ * (1385) with J P = 3/2 + .Here we re-examine some old data of the K￣p→Λπ*π + reaction.Firstly we re-fit the data for kaon beam momenta in the range of 1.0 - 1.8 GeV.Secondly we study the reaction at the energies around Λ*(1520) peak.Both studies show evidence for the existence of Σ*with J P = 1/2-around 1380 MeV.Higher statistic data on relevant reactions are needed to clarify the situation.     

~(14)N~(16)O分子X~2Π_(3/2)R(1.5)v=0→1及~(15)N~(16)O分子X~2Π_(3/2)Q(1.5)v=0→1跃迁的FLMR光谱

本文采用法拉弟效应的激光磁共振光谱技术，研究了－氧化氮分子１４Ｎ１６ＯＸ２Π３／２Ｒ（１．５）ｖ＝０→１和同位素分子１５Ｎ１６ＯＸ２Π３／２Ｑ（１．５）ｖ＝０→１跃迁的ＦＬＭＲ光谱，实验给出了样品浓度和信号强度之间的关系及调制磁场强度与ＦＬＭＲ信号强度之间的关系。     

(2+1)维Korteweg-de Vries方程的传播孤子及混沌行为

利用一个投射方程和变量分离法,得到了(2+1)维Korteweg-de Vries(KdV)方程的新显式精确解.根据得到的孤立波解,构造出KdV方程的传播孤子结构.利用一个新的混沌系统研究了孤子的混沌行为。     

高温空气中NO分子β(B2Πr-X2Πr)及γ(A2Σ+-X2Πr) 发光带系的Franck-Condon因子计算

在双原子分子核运动的波动方程中,计入分子的振转相互作用项,得出的波函数除与振动量子数有关外,还与转动量子数有关。本文用该波函数编程计算了高温空气中ＮＯ分子β（Ｂ２Πｒ－Ｘ２Πｒ）及γ（Ａ２Σ＋－Ｘ２Πｒ）带系的Ｆｒａｎｃｋ－Ｃｏｎｄｏｎ因子。计算中转动量子数的取值由Ｊ＝０取至Ｊ＝２００,结果适用于低温和高温条件。     

Hg~+离子5d~(10)6s ~2S_(1/2)→5d~96s~2 ~2D_(5/2)钟跃迁同位素位移和超精细结构的理论研究

本文首先在Dirac-Hartree-Fock近似下理论评估了Hg~+离子5d~(10)6s ~2S_(1/2)→5d~96s~2 ~2D_(5/2)钟跃迁的质量位移(mass shift, MS)和场位移(field shift, FS)在其同位素位移(isotope shift, IS)中的相对贡献,发现MS远小于FS而可以被忽略.在此基础上,通过系统地考虑该原子体系中主要的电子关联效应,计算了这条钟跃迁FS的精确值以及涉及到的上下两个能级的超精细结构常数,并得到了几种稳定汞同位素离子该跃迁的IS和超精细结构分裂.其中,计算的~(199)Hg~+和~(198)Hg~+离子之间的钟跃迁频率偏移与已有实验测量值相比误差为2%左右.最终,本文给出了汞离子7种常见同位素该谱线的绝对频率值,为实验上的谱线测量提供了有效的理论依据.     

Conditional transformation of drift formula and potential theory for 1/2Δ+b(·)·∇

Using conditional Brownian motion and the transformation of drift formula (of Cameron-Martin, Girsarov, Maruyama) we give integral conditions on a vector fieldb which imply the harmonic measures and Green functions for 1/2 and 1/2+b(·)· on a bounded Lipschitz domainD are equivalent. By equivalent we mean there exist two-sided inequalities with constants depending only onb andD. This enables one to conclude the potential theory for 1/2+b(·)· onD and 1/2 onD are the same.     

O(α_sv~2) correction to J/ψ plus η_c production in e~+e~- annihilation at √s=10.6 GeV

Based on the nonrelativistic QCD factorization approach, O(α_sv2) corrections to J/ψ plus η_c production in m e⁺e^- annihilation at √s=10.6 ≥v are calculated in this work. The numerical results show that the correction at α_sv2 order is only about a few percent of the total theoretical result. This indicates that the perturbative expansions become convergent and that a higher order correction will be smaller. The uncertainties from the long-distance matrix elements, renormalization scale and the measurement in the experiment are also discussed. Our result is in agreement with the previous result by Jia.