D+和D0介子的φXl+υ遍举分支比上限的测定

利用北京谱仪(BES)在北京正负电子对撞机(BEPC)e+e-质心系能量为4.03GeV处采集的积分亮度为22.3pb-1的数据,从D介子的5个非轻子衰变模式中共选出2471±218组tagD+X(X可能是γ或π0或π±)和7629±251组tagD0X介子样本. 在这些样本中没有找到D+→φe+υ,φK-π+e+υ,和D0→φK-e+υ,φK-μ+υ的衰变事例,测定在90髎置信度下分支比的上限分别为B(D+→φe+υ)<1.38髎,B(D+→φK-π+e+υ)<2.01髎,B(D0→φK-e+υ)<0.53髎,和B(D0→φK-μ+υ)<0.53髎.     

扩展的纽结量子引力态

给出了微分同胚群的表示.以扩展的Gauss不变量φG和Jones多项式第二个系数J2为基本片段,构造了满足齐次微分同胚约束(D约束)的扩展knot不变量引力态φGJ2,(J2)2和(φG)2J2.得到了它们的具体表式,并通过具体计算,给出了它们满足齐次D约束的证明. 关键词： 微分同胚约束 扩展knot不变量 量子引力态     

新粒子的质量谱

如果把φ（4030）看作是D^*和D^*的亚稳结合态而不看作是J/φ的激发态,那么J/φ的激发态能谱可以用本征值为质量平方的简谐振子波动方程来描绘,情形和通常介子一样。唯一差别是能级平方的间隔为通常强子的两倍。同样结论也适用于γ粒子但相应的能级平方间隔为通常强子的5.6倍。本文还计算了张量力所导致的S波和D波的混合从而给出D波为主的激发态φ（3770）的能级。     

Weighted nonlinear phase shift with group velocity dispersion to assess the nonlinear penalty in C L band long-haul fiber optical amplified transmission link

To assess the penalty due to nonlinear effect in C L band long-haul optical amplified transmission link,a new parameter of modified nonlinear phase shift (φD) is proposed,which is the accumulated nonlinear phase shift weighted by a normalized group velocity dispersion (GVD).Based on the numerical simulation result of broadband long-haul hybrid Raman/erbium-doped fiber amplified transmission line,it is validated thatφD is more reasonable and suitable than the previous proposed nonlinear phase shift (φNL) for broadband applications.     

矢量介子φ的动力学模型及耦合常数f_(φK■)~2,f_(ωK■)~2与f_(ρK■)~2的值

假设矢量介子φ(Ι=0,ι=1,m_φ=7.30m_π)是K散射交换ρ,ω以及φ介子本身而形成的共振。应用双色散关系中的N/D方法,并设ρ,ω以及交换的φ介子的质量为已知,近似求出K的分波散射振幅。当要求该振幅能重新给出正确的共振位置(φ的质量)和宽度时,即可得出偶合常数f_(ρκ)、f_(ωκ)与f_(φκ)所必需满足的关系,从而给出它们可能取的数值。     

The Dφ Data Handling System

In this paper we highlight strategies and choices that make the Dφ Data Handling system markedly different from many other experiments‘ systems,We emphasize how far the Dφ system has come in innovating and implementing a Dφ-specific Data Grid system.We discuss experiences during the first months of detector commissioning and give some future plans for the system.     

矢量介子φ的动力学模型及耦合常数fφKK2,fωKK2与fρKK2的值

假设矢量介子φ(Ι=0,ι=1,m_φ=7.30m_π)是K散射交换ρ,ω以及φ介子本身而形成的共振。应用双色散关系中的N/D方法,并设ρ,ω以及交换的φ介子的质量为已知,近似求出KK的分波散射振幅。当要求该振幅能重新给出正确的共振位置(φ的质量)和宽度时,即可得出偶合常数f_φKK²、f_ωKK²与f_ρKK²所必需满足的关系,从而给出它们可能取的数值。     

Deformed two-dimensional rogue waves in the (2+1)-dimensional Korteweg–de Vries equation

Within the(2+1)-dimensional Korteweg–de Vries equation framework,new bilinear B¨acklund transformation and Lax pair are presented based on the binary Bell polynomials and gauge transformation.By introducing an arbitrary functionφ(y),a family of deformed soliton and deformed breather solutions are presented with the improved Hirota’s bilinear method.By choosing the appropriate parameters,their interesting dynamic behaviors are shown in three-dimensional plots.Furthermore,novel rational solutions are generated by taking the limit of the obtained solitons.Additionally,twodimensional(2D)rogue waves(localized in both space and time)on the soliton plane are presented,we refer to them as deformed 2D rogue waves.The obtained deformed 2D rogue waves can be viewed as a 2D analog of the Peregrine soliton on soliton plane,and its evolution process is analyzed in detail.The deformed 2D rogue wave solutions are constructed successfully,which are closely related to the arbitrary functionφ(y).This new idea is also applicable to other nonlinear systems.     

量子引力扩展圈表象中微分同胚约束的作用

以不同方法将微分同胚约束(D约束)对扩展圈表象抽象波函数的作用特殊化到圈表象上.以Chern–Simons两点传播子乘积项为量子引力态基本片段,构造出了满足齐次D约束作用的扩展knot不变量引力态(*φ_G)ⁿ.对其中n=1,2之引力态分别进行了满足齐次D约束的具体证明;对n>2之引力态给出了一般证明.     

反应物振动量子数对O(~1D)+HBr→OH+Br立体动力学影响的研究

采用准经典轨线(QCT)方法计算了O(1D)+HBr→OH+Br反应体系的立体动力学反应.基于由Peterson(J.Chem.Phys.113(2000)4598)等人开发的基态势能面上,计算了反应的矢量相关性质,极角p(θ)r及方位角pφ()r以及空间角pθr,φ()r.此外我们还计算了极化微分反应截面(PDDCSs)的分布各矢量性质随各振动量子数变量的变化.结果表明反应受反应物振动量子数影响较大.     

顶夸克质量的最新结果

实验室的Dφ合作组的物理学家们对顶夸克的质量进行了迄今为止最精确的测量．结果对于寻找与质量起源有关的Higgs粒子以及寻找超出粒子物理标准模型的新物理有重要意义(论文发表在Nature，429：638上)．     

Effects of Pure Dzyaloshinskii-Moriya Interaction with Magnetic Field on Entanglement in Intrinsic Decoherence

We investigate the effects of pure Dzyaloshinskii-Moriya(DM) interaction with magnetic field on entanglement in intrinsic decoherence,assuming that the system is initially in four Bell states |φ± =(|00 ± |11)/2~(1/2) and|ψ± =(|01) ± |10)/2~(1/2) respectively.It is found that if the system is initially in the state ρ1(0) = |φ+φ+|,the entanglement can obtain its maximum when the DM interaction vector D is in the plane of XOZ and magnetic field B = B_y with the infinite time t,moreover the entanglement is independent of B_y and t when B_y is perpendicular to D.In addition,we obtain similar results when the system is initially in the states ρ2(0) =|φ-φ-| or ρ3(0) = |ψ+ψ+|.However,we find that if the system is initially in the state ρ4(0) =|ψ-ψ-|,the entanglement can obtain its maximum for infinite t,when the DM vector is in the plane of YOZ,XOZ,or XOY,with the magnetic field parallel to X,Y,or Z axis,respectively.Moreover,when the axial B is perpendicular to D for the initial state ρ4(0),the negativity oscillates with time t and reaches a stabie value,the larger the value of B is,the greater the stable value is,and the shorter the oscillation time of the negativity is.Thus we can adjust the direction and value of the external magnetic field to obtain the maximal entanglement,and avoid the adverse effects of external environment in some initial state.This is feasible within the current experimental technology.     

齐次平衡法求解非线性SCHR(O)DINGER方程

用齐次平衡法求解了非线性Schr(O)dinger方程iφt+a1φxx+a2φ-a3|φ|2φ=0,并讨论了解与方程系数的关系.     

齐次平衡法求解非线性SCHR绑DINGER方程

用齐次平衡法求解了非线性Ｓｃｈｒｄｉｎｇｅｒ方程ｉφｔ＋ａ１φｘｘ＋ａ２φ－ａ３｜φ｜２φ＝０,并讨论了解与方程系数的关系。     

D—D中子在聚乙烯球壳内的反应率测量

开展D-D聚变中子与聚乙烯球壳作用的中子学积分实验，用于检验计算方法和相关核数据。实验装置由D—D中子源与聚乙烯球壳组成，中子源在聚乙烯球壳外，距球壳外表面35mm。聚乙烯球壳由两个半球壳组成，外径φ386mm，厚度100mm。聚乙烯球壳中心与靶心的轴线水平。     

采用准经典轨迹的方法研究碰撞能对C+CD→C2+D反应的影响

运用准经典轨线方法,基于¹A'势能面[Mol. Phys. 98, 1925(2000)],从理论上研究了碰撞能对C+CD→C₂+D反应的立体动力学性质的影响．计算并且详细讨论了与产物矢量相关的三个极化分布函数P(θr), P(φr)和P(θr,φr)．此外,在质心坐标系中,研究了碰撞能对两个极化微分反应截面的影响．结果表明,产物C₂的立体动力学性质对反应物分子的碰撞能非常敏感.     

同位素取代和碰撞能对N（4S）＋H2反应立体动力学性质的影响

基于Poveda等计算得到的DMBE势能面,运用准经典轨线的方法研究了同位素取代和碰撞能对N（4S）＋H2反应的立体动力学性质的影响．计算并讨论了两矢量k-J’相关分布函数P（θr）,三矢量k—k＇-j’相关分布函数P（φr）,空间分布函数P（θr,φr）,微分反应截面和积分反应截面．研究了碰撞能从25kcal/mol到80kcal/mol变化对三个反应N＋H2,N＋D2和N＋T2的影响．结果表明：分子间同位素和碰撞能均会对反应立体动力学性质产生一定的影响．     

振动与波中的两个问题讨论

一、如何唯一决定简谐振动中的初相在普通物理课本中,一般都说根据下式可以决定初相: tgφ=-v_0/(ωX_0) (1)φ——初相;v_0——初始速度;X_0——初始位置;ω——圆频率。但是,对于每一个正切值,φ都有两个解φ_1,φ_2。故由(1)式便不能唯一地决定初相了。我们又知道,初相也可以由X_0=Acosφ(2)即cosφ=X_0/A (2′)来决定。但这样决定的φ也有两个解φ_1~′,φ_2~′。我们注意到φ_1,φ_2中和φ_1~′,φ_2~′中只有一个是共同的,另一个是不同的。真正的初相应同时满足(1)和(2′)。所以,要想唯一地决定初相,应由(1)和(2′)联合起来解,同时满足(1)和(2′)的φ便是真正的初相,它也是唯一的。     

S-D混合与φ(3770)的电偶极跃迁

本文在粲偶素势模型的框架内,讨论了φ(3770)与φ(3686)之间的2~3S_1-1~3D_1混合对φ(3770)与φ(3686)电偶极跃迁的影响。结论是混合角θ=30°应子排除,而θ=—10°虽然可以对φ(3770)→X_0γ和φ(3686)→X_0γ给出改善的结果,但仍不能解决φ(3770)→X_1γ与实验的矛盾。     

微光CCD象敏器特性的研究

本文对微光CCD象敏器的性能(如动态范围、信噪比、量子效率、热生背景电荷、转移效率等)进行了测量和研究。例如,测量转移效率用电注入法;采用单色光源入射到CCD象敏器上,测量量子效率。根据CCD象敏器的工作原理,设计了一套计算时沖频率φ_1、φ_2、φ_3、光柵脉冲φ_P及转移脉冲φ_X等的工作波形图,还对φ_P、φ_X波形的获得进行了分析,以达到能够对徽光CCD象敏器参数进行测量的目的。最后,对微光CCD象敏器性能参数的测量结果与理论值进行了对比。由本试验结果表明,基本上反决了微光CCD的性能,对研究CCD在微光、红外、紫外成象方面都起着有益的作用。