BOTTOM MESONS(B=±1)B~+=u,B~0=d,B~0=db,B~-=b,similarly for B~*'s

<正>B-particle organization Many measurements of 8 decays involve admixtures of B hadrons.Previously we arbitrarily included such admixtures in the B~±section,but because of their importance we have created two new sections:B~±/B~0 Admixture"for T(4S)results and"B~±/B~0/B_(s~0)/b-baryon Admixture"for results at higher energies.Most inclusive decay branching fractions and x_b at high energy are found in the Admixture sections.B~0-B~0mixing data are found in the 6°section,while B_(s~0)-B_(S~0)mixing data and B-B mixing data for a B~0/B_(s~0)admixture are found in the B_(s~0)section.CP-violation data are found in the B~±,S~0,and B~±B~0 Admixture sections.b-baryons are found near the end of the Baryon section.Recently,we also created a new section:"V_(cb)and     

CHARMED BARYONS(C=+1)∧_c~+=udc,∑_c~(++)=uuc,∑_c~+=udc,∑_c~0=ddc,≡_c~+=usc,≡_c~0=dsc,Ω_c~0=ssc

<正>CHARMED BARYONS Revised March 2012 by C.G.Wohl(LBNL).There arc 17 known charmed baryons,and four other candidates not well enough established to be promoted to the Summary Tables.*Fig.1(a)shows the mass spectrum,and for comparison Fig.1(b)shows the spectrum of the lightest strange baryons.The∧_c and∑_c spectra ought to look much like the A and∑spectra,since a∧_c or a∑_c differs from a A or a E only by the replacement of the s quark with a c quark.However,a 3 or anΩhas more than one s quark,only one of which is changed to a c quark to make aΞ_c or anΩ_c.Thus theΞ_C andΩ_c spectra ought to be richer than the E and$2 spectra.**     

DOUBLY CHARMED BARYONS(C=+2)≡_(cc)~(++)=ucc,≡_(cc)~+=dcc,Ω_(cc)~+=scc

<正>~~     

LIGHT UNFLAVORED MESONS(S=C=B=0)For I=1(π,b,ρ,a):ud,(uu-dd)/2~(1/2),du;for I=0(η,η',h,h',ω,Φ,f,f'):c_1(u+dd)+c_2(s)

<正>π~±IG(JP)=l-(O-)We have omitted some results that have been superseded by later experiments.The omitted results may be found in our 1988 edition Physics Letters B204 1(1988).π~±MASS The most accurate charged pion mass measurements are based upon xray wavelength measurements for transitions inπ~-mesonic atoms.The observed line is the blend of three components,corresponding to different K-shell occupancies.JECKELMANN 94 revisits the occupancy question,with the conclusion that two sets of occupancy ratios,resulting in two different pion masses(Solutions A and B),are equally probable.We choose the higher Solution B since only this solution is consistent with a positive mass-squared for the muon neutrino,given the precise muon momentum measurements now available(DAUM 91,ASSAMAGAN 94,and ASSAMAGAN 96)for the decay of pions at rest.Earlier mass determinations with pi-mesonic atoms may have used incorrect K-shell screening corrections.Measurements with an error of0.005 MeV have been omitted from this Listing.     

BOTTOM BARYONS(B=-1)∧_b~0=udb,≡_b~0=usb,≡_b~-=dsb,Ω_b~-=ssb

<正>~~     

Wn C0,±(n=1,…,6)团簇结构与电子性质的理论研究

利用密度泛函理论(DFT)中的杂化密度泛函B3LYP在Lanl2dz基组水平上对WnC0.±(n=1,…,6)团簇的各种可能构型进行几何结构优化,得出它们的基态构型,并对基态构型的稳定性和电子性质进行理论研究.结果表明,当n＞3时,稳定构型从平面转变成立体结构,同时C原子趋向于表面最稳定;C原子的掺入使得Wn团簇的稳定...     

从S(u)曲线探讨T=±OK,T=±∞K 状态的特性

本文从Ｓ（ｕ）曲线探讨Ｔ＝±ＯＫ，Ｔ＝±∞Ｋ四个极端状态的特性．文中讨论了在Ｔ＝±ＯＫ及Ｔ＝±∞Ｋ时ＧＸ＝０，因此这四个极端状态均不能作为“热库”，均无热功转换的特性，不存在包含任一状态的卡诺循环．但是却存在类似于能氏定理的ｌｉｍ（△ｓ）ｒ＝０及ｌｉｍ Ｔ＝－ＯＫ Ｔ＝＋∞Ｋ（△ｓ）Ｔ＝０的公式．本文还对研究这些极端状态的必要性与重要性进行了探讨．     

Re-study of the contribution of scalar potential and spectra of c, b and b(c) families

We indicated in our previous work that for QED the role of the scalar potential which appears at the loop level is much smaller than that of the vector potential and is in fact negligible. But the situation is different for QCD, one reason is that the loop effects are more significant because α s is much larger than α, and second the non-perturbative QCD effects may induce a sizable scalar potential. In this work, we study phenomenologically the contribution of the scalar potential to the spectra of charmonia, bottomonia and b(c) families. Taking into account both vector and scalar potentials, by fitting the well measured charmonia and bottomonia spectra, we re-fix the relevant parameters and test them by calculating other states of not only the charmonia and bottomonia families, but also the b family. We also consider the Lamb shift of the spectra.     

Anomalies in(semi)-leptonic B decays B~±→τ~±ν,B~±→Dτ~±ν and B~±→D~*τ~±ν,and possible resolution with sterile neutrino

The universality of the weak interactions can be tested in semileptonic b→c transitions,and in particular in the ratios R(D~(*)) ≡Γ(B → D(*)τν)/Γ(B → D~(*)lν)(where 1 = μ or e).Due to the recent differences between the experimental measurements of these observables by Ba Bar,Belle and LHCb on the one hand and the Standard Model predicted values on the other hand,we study the predicted ratios R(D~(*))=Γ(B→D~(*)τ+"missing")/Γ(B→D(*)lν)in scenarios with an additional sterile heavy neutrino of mass ～1 Ge V.Further,we evaluate the newly defined ratio R(0)≡Γ(B→τ+"missing")/Γ(B→μν) in such scenarios,in view of the future possibilities of measuring the quantity at Belle-Ⅱ.     

羟基水团簇OH~n(H_2O)_3(n=0,±1)的比较研究

使用粒子群优化算法结合从头算方法得到了羟基水团簇OH~n(H_2O)_3(n=0,±1)的低能结构,并对考虑零点能后最稳定的团簇的成键、分子轨道和红外性质进行了对比研究.对最高占据轨道进行键序分析表明:阴离子团簇中的外来电子占据了羟基中的氧原子的空轨道,自由基型团簇中的部分电子从水分子转移到了羟基上,阳离子团簇中形成了很强的氧氧键.对这些团簇的红外谱进行了计算和分析,这将为相关实验提供理论参考.     

Inclusive ϱ0,K *±(892) andf production in\bar p p Interactions at 12 GeV/c

Inclusive production of ?⁰,K ^*±(892), andf is studied in \(\bar p\) p interactions at 12 GeV/c. The inclusive cross sections for ?⁰,K ^*±(892), andf are found to be 6.7±0.3 mb, 1.0±0.2 mb, and 1.4±0.3 mb, respectively. The differential cross sections are presented as a function of c.m. rapidity, Feynmanx and square of the transverse momentump _T ² . Comparison with the correspondingpp data shows some interesting differences which can be attributed to the \(\bar p\) p annihilation. The results are compared with the predictions of the quark fusion model.     

Ni_n~(0,±)(n=1-9)团簇的密度泛函理论研究

在密度泛函理论框架下,采用广义梯度近似泛函BPW91研究了Ni_n~(0,±)(n=1-9)团簇的几何结构,电子性质和稳定性.结果表明,Nin+和Nin-团簇的稳定结构都保持了中性Nin团簇的框架,只是结构的稳定性顺序发生了变化.此外,稳定性的分析表明Nin团簇失去一个电子可以大大增强团簇的稳定性,得到一个电子不能增强团簇的稳定性.能量二阶差分、分裂能、HOMO-LUMO能隙随团簇尺寸的演化都没有表现出明显的奇偶振荡行为,但在n=7时均有较大的值,说明相对应的团簇具有较高的稳定性,也说明得到或失去一个电子不能改变n=7的幻数特性.     

Nin(0,±)(n=1-9)团簇的密度泛函理论研究

在密度泛函理论框架下, 采用广义梯度近似泛函BPW91研究了Nin(0,±)(n=1-9)团簇的几何结构, 电子性质和稳定性. 结果表明, Nin+和Nin—团簇的稳定结构都保持了中性Nin团簇的框架, 只是结构的稳定性顺序发生了变化. 此外, 稳定性的分析表明Nin团簇失去一个电子可以大大增强团簇的稳定性, 得到一个电子不能增强团簇的稳定性. 能量二阶差分、分裂能、HOMO-LUMO能隙随团簇尺寸的演化都没有表现出明显的奇偶振荡行为, 但在n=7时均有较大的值, 说明相对应的团簇具有较高的稳定性, 也说明得到或失去一个电子不能改变n=7的幻数特性.     

WnSi02,±(n=1～5)团簇结构与光谱的理论研究

利用密度泛函理论(DFT)在B3LYP/Lanl2dz水平上对WnSi0,2±(n=1～5)团簇的各种可能构型进行了几何结构优化,预测了各团簇的基态结构.并对基态构型的平均结合能、能隙、红外光谱及拉曼光谱进行了系统的理论分析.结果表明:WnSi0,2±(n=2～5)团簇的基态结构及亚稳态结构中的Si-Si原子不成键,W5Si0,2±团簇的基态构型与W7团簇的基态构型相似,W3Si2+团簇的基态构型与W0,5±团簇的基态构型相似;W5Si2-团簇是比较理想的复合材料;WnSi0,2±(n=1～5)团簇的所有IR吸收峰都属于红外光谱中的指纹区的特征吸收区域;除W4Si2-团簇外,其它团簇都具有非刚性特性.     

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.     

AlC-(X3Ⅱ,a1∑+,b1△,c1Ⅱ)光谱属性的B3LYP研究

选择6-311++G(2df)、6-311++G(3df)、cc-PVDZ、AUG-cc-PVDZ、cc-PVTZ、AUG-cc-PVTZ六种不同的基组,应用密度泛函理论的B3LYP方法,对双原子分子离子AlC-的基态X3Ⅱ和第二激发态a1∑+的结构、光谱常数和分子属性进行了详细的理论研究.通过对六个基组的计算结果与以往文献报道的数据的比较,得到AUG-cc-PVTZ基组是六个基组中最优基组.使用AUG-cc-PVTZ基组,对AlC-的第三激发态b1△和第四激发态以c1Ⅱ进行了单点能扫描计算,并计算了其光谱数据.部分光谱数据还是第一次给出理论的报道.     

DFT investigation on A4B4 (A=Cu,Ag; B=As,Sn) metal–semiconductor alloy clusters for potential nanomaterials

A detail investigation on the stability and electronic properties for A₄B₄ (A=Cu, Ag; B=As, Sn) metal–semiconductor alloy clusters, is performed in search for the stable and potential motifs. A very popular hybrid exchange–correlation functional, B3LYP as proposed by Becke is employed for this purpose, under the density functional formalism. To understand the possible potential of the predicted A₄B₄ systems, frontier molecular orbitals (FMOs) are also analyzed along with the DFT based electronic parameters. The ground state structure for each of the A₄B₄ systems is predicted. Also, a couple of nearly simple-cubic unit cells are identified for respective cluster-assembled/ bulk materials.     

相对论密度泛函研究YSin± (n=1-6)离子团簇

运用广义梯度近似的相对论密度泛函方法对带电荷的YSin±(n=1-6)团簇的几何结构、稳定性、电子和成键特性进行了系统的研究. 与相应的中性YSin团簇相比,除了YSi4+和YSi5+之外,YSin±团簇基本都保持了YSin中性团簇的结构框架,这与对垂直和绝热电离能的分析结果本质上是一致的;同时,大多数离子团簇的稳定性都有明显增强,其中YSin±(n=2和5)团簇比其相邻团簇的稳定性更强. 电荷布局分析表明电荷将对Y与Sin框架之间的电荷转椅量有明显影响. HOMO-LUMO能隙研究表明：带电的YSin团簇比其中性团簇的化学稳定性更强.     

Calculations of the lattice dynamics and spontaneous polarization for thin ferroelectric films of disordered solid solutions PbB′1/2 B″1/2O3 (B′ = Sc,Ga, In,Lu; B″ = Nb,Ta)

Physics of the Solid State - The lattice dynamics and spontaneous polarization in thin ferroelectric films of disordered solid solutions PbB′1/2 B″1/2 O3 (B′ = Sc, Ga, In, Lu;...     

Properties of ceramic manganite (La0.65Sr0.35)1 − x Mn1 + x O3 ± Δ (x = 0, 0.1, 0.2) sintered at a temperature of 1500°C

It has been shown for the first time that the structure of (La_0.65Sr_0.35)_{1 ? x} Mn_{1 + x} O_{3 ± Δ} (x = 0, 0.1, 0.2) ceramics sintered at 1500°C substantially depends on the content of superstoichiometric Mn. It has been found that the average grain size increases from 10 to >100 μm with increasing x from 0 to 0.2. It has been revealed that grains of the ceramic samples sintered from powders with excess Mn have an internal nanoscale layered structure. A correlation has been revealed between the size and structure of grains and and the magnetoresistive properties.