Temperature dependence of the rate constant of ionic analogs of H + H2 → H2 + H reaction by quantum instanton method

Rate constant ratios k(T)/k(1,500K) for two symmetrical reactions H^? + H₂ → H₂ + H^? and H⁺ + H₂ → H₂ + H⁺ are reported. Direct method based on quantum instanton approximation for evaluation of the temperature dependence of the quantum‐mechanical reaction rate constant is used. Implementation of the theory involves thermodynamic integration and path integral Monte Carlo method. Results of anionic case shows resemblance to neutral case, whereas cationic case is significantly different and below 1,000K rate constant shows strong deviation form linearity of Arrhenius plot due to high activation barrier. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2012     

SU（3） Simple Group Model and New Z＇ Properties in Future Linear Colliders

In the SU（3） simple group model, the new neutral gauge boson Z＇ couples to pairs of SM fermions with couplings fixed in terms of the SM gauge couplings and depending only on the choice of the fermion embedding. In this paper, we calculate the contributions of this new particle to the processes e^＋e^-→l^＋l^-, bb^-, and cc^- and study the possibility of detecting this new particle via these processes in the future high-energy linear e^＋e^- collider（LC） experiments with √s= 500 GeV and ￡int= 340 fb^-1. We find that the new gauge boson Z＇ is most sensitive to the process e^＋e^-→b^＋b^-. As long as Mz,≤2 TeV , the absolute values of the relative correction parameter are larger than 5%. We calculate the forward-backward asymmetries and left-right asymmetries for the process e^＋e^-→c^＋c^-, with both the universal and anomaly-free fermion embeddings. Bounds on Z＇ masses are also estimated within 95% confidence level.     

关于空间判断失误的扎记Ⅳ.单斜晶系:从非心到有心空间群

报道了 12个从单斜无心修正为单斜有心的晶体结构。其中 1例从C2修正到C2 /m ,2例从P2 1 到P2 1 /c。 9例从Cc到C2 /c ,除Cc修正到C2 /c的 6例已见诸文献外 ,列出其余 6例在较高对称空间群下的原子坐标     

二氯-二[2-甲氧基-6-(2'-羟乙基亚胺基甲基)苯酚]合镉(II)的 结构再研究

标题化合物的晶体结构曾用单斜晶系的空间群Cc描述。我们再研究确定其空间群应为正交晶系的Fdd2。修正涉及晶体的晶系、晶类和布拉维格子类型的改变,但仍属可呈现非线性光学活性的非心对称空间群。给出了在空间群Fdd2时的非氢原子坐标和主要键长和键角值。     

Entropy of a Black Hole with Distinct Surface Gravities

In gravitational thermodynamics, the entropy of a black hole with distinct surface gravities can be evaluated in a microcanonical ensemble. At the WKB level, the entropy becomes the negative of the Euclidean action of the constrained instanton, which is the seed for the black hole creation in the no-boundary universe. Using the Gauss-Bonnet theorem, we prove the quite universal formula in Euclidean quantum gravity that the entropy of a nonrotating black hole is one quarter the sum of the products of the Euler characteristics and the areas of the horizons. For Lovelock gravity, the entropy and quantum creation of a black hole are also studied.     

Instanton Effects on Gluon Propagator

Gluon propagator is investigated for pure Yang-Mills SU(3) gauge theory in field-strength approach. It is found that instantons provide a homogeneous solid-like medium background which generates finite nonzero momentum gluon propagator and gluon receives effective mass.     

费米子动力学效应对胶子凝聚的贡献

研究了费米子动力学效应对两胶子、三胶子凝聚的贡献,研究结果表明:随温度升高,胶子凝聚值比未计及费米子动力学效应衰减得更快;并且随着夸克味数的增加,加快衰减.当味数N_f=3时,胶子凝聚消失的温度为T_0≈200MeV。     

The thermodynamic Bethe ansatz and the 1/N correction to the density phase transition in the Gross-Neveu model

We compute the 1/N correction to the location of the previously found first-order phase transition in the Gross-Neveu model at a chemical potential where m is the fermion mass. We employ an expression for the free energy f(μ) given by the thermodynamic Bethe ansatz under the approximation that the fundamental fermions dominate the ground state, and combine it with the effective potential evaluated at zero chemical potential.

Our result is .     

Selected topics in Higgs physics at the LHC

In this talk I discuss a few selected topics in Higgs phenomenology at the LHC. After some brief remarks on the standard model Higgs I turn to more novel possibilities, discussing a heavy Higgs scenario, a light Higgs scenario and a no Higgs scenario. In the case of the light Higgs, I discuss briefly the physics opportunities afforded if it becomes possible to detect low angle scattered protons at the LHC.