102,874 research outputs found

    The NLO QCD Corrections to BcB_c Meson Production in Z0Z^0 Decays

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    The decay width of Z0Z^0 to BcB_c meson is evaluated at the next-to-leading order(NLO) accuracy in strong interaction. Numerical calculation shows that the NLO correction to this process is remarkable. The quantum chromodynamics(QCD)renormalization scale dependence of the results is obviously depressed, and hence the uncertainties lying in the leading order calculation are reduced.Comment: 14 pages, 7 figures; references added; expressions and typos ammende

    The thermal effect on conical shells of linearly varying thickness progress report no. 2

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    Thermal effect on isotropic conical shells of linearly varying thicknes

    Technological Change and Wage Differentials Results and Policy Implications From a Dynamic Intertemporal General Equilibrium Model.

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    The effect of technological change on wage differentials between skilled and unskilled labour has been extensively investigated. However, the existing literature provides controversial results. This paper provides insights into the relationship between technological change and wage differentials by constructing a DIGE models of a closed economy. This model suggests a range of policy implications.TECHNOLOGICAL CHANGE ; WAGES ; LABOUR

    On conical shells of linearly varying thick- ness subjected to lateral normal loads progress report no. 1

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    Conical shells with linear thickness variation subjected to lateral normal load

    International Trade, Productivity Growth, Education and Wage Differentials: A Case Study of Taiwan.

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    The source of changes in the wage differential between skilled and unskilled labor has been an important subject of debate for several decades. International trade and productivity growth are two main causes that have been suggested from large country studies. Recent research proposes education as another influence. All three causes have been significantly associated with Taiwan's economic development. This paper attempts to contribute to the literature by investigating wage differentials of Taiwan, a small open economy with a paucity of study on the issue of trade and wages. An Error Correction Model (ECM) incorporating both short and long term run effects is employed.WAGES ; INTERNATIONAL TRADE ; PRODUCTIVITY

    Estimating Form Factors of BsDs()B_s\rightarrow D_s^{(*)} and their Applications to Semi-leptonic and Non-leptonic Decays

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    Bs0DsB_s^0\rightarrow D_s^{-} and Bs0DsB_s^0\rightarrow D_s^{*-} weak transition form factors are estimated for the whole physical region with a method based on an instantaneous approximated Mandelstam formulation of transition matrix elements and the instantaneous Bethe-Salpeter equation. We apply the estimated form factors to branching ratios, CP asymmetries and polarization fractions of non-leptonic decays within the factorization approximation. And we study the non-factorizable effects and annihilation contributions with the perturbative QCD approach. The branching ratios of semi-leptonic Bs0Ds()l+νlB_s^0\rightarrow D_s^{(*)-}l^+\nu_l decays are also evaluated. We show that the calculated decay rates agree well with the available experimental data. The longitudinal polarization fraction of BsDsV(A)B_s\rightarrow D_s^*V(A) decays are 0.8\sim0.8 when V(A)V(A) denotes a light meson, and are 0.5\sim0.5 when V(A)V(A) denotes a DqD_q (q=d,sq=d,s) meson.Comment: Final version published in J Phys. G 39 (2012) 045002 (Title also changed

    Production of the PP-Wave Excited BcB_c-States through the Z0Z^0 Boson Decays

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    In Ref.[7],we have dealt with the production of the two color-singlet SS-wave (cbˉ)(c\bar{b})-quarkonium states Bc((cbˉ)1[1S0]>)B_c(|(c\bar{b})_{\bf 1}[^1S_0]>) and Bc((cbˉ)1[3S1]>)B^*_c(|(c\bar{b})_{\bf 1}[^3S_1]>) through the Z0Z^0 boson decays. As an important sequential work, we make a further discussion on the production of the more complicated PP-wave excited (cbˉ)(c\bar{b})-quarkonium states, i.e. (cbˉ)1[1P1]>|(c\bar{b})_{\bf 1}[^1P_1]> and (cbˉ)1[3PJ]>|(c\bar{b})_{\bf 1}[^3P_J]> (with J=(1,2,3)J=(1,2,3)). More over, we also calculate the channel with the two color-octet quarkonium states (cbˉ)8[1S0]g>|(c\bar{b})_{\bf 8}[^1S_0]g> and (cbˉ)8[3S1]g>|(c\bar{b})_{\bf 8}[^3S_1]g>, whose contributions to the decay width maybe at the same order of magnitude as that of the color-singlet PP-wave states according to the naive nonrelativistic quantum chromodynamics scaling rules. The PP-wave states shall provide sizable contributions to the BcB_c production, whose decay width is about 20% of the total decay width ΓZ0Bc\Gamma_{Z^0\to B_c}. After summing up all the mentioned (cbˉ)(c\bar{b})-quarkonium states' contributions, we obtain ΓZ0Bc=235.9122.0+352.8\Gamma_{Z^0\to B_c} =235.9^{+352.8}_{-122.0} KeV, where the errors are caused by the main uncertainty sources.Comment: 8 pages, 5 figures and 2 tables. basic formulae in the appendix are cut off to match the published version, which can be found in v1. to be published in Eur.Phys.J.

    Z0Z_0 Boson Decays to Bc()B^{(*)}_c Meson and Its Uncertainties

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    The programming new e+ee^{+}e^- collider with high luminosity shall provide another useful platform to study the properties of the doubly heavy BcB_c meson in addition to the hadronic colliders as LHC and TEVATRON. Under the `New Trace Amplitude Approach', we calculate the production of the spin-singlet BcB_c and the spin-triplet BcB^*_c mesons through the Z0Z^0 boson decays, where uncertainties for the production are also discussed. Our results show Γ(1S0)=81.440.5+102.1\Gamma_{(^1S_0)}= 81.4^{+102.1}_{-40.5} KeV and Γ(3S1)=116.462.8+163.9\Gamma_{(^3S_1)}=116.4^{+163.9}_{-62.8} KeV, where the errors are caused by varying mbm_b and mcm_c within their reasonable regions.Comment: 11 pages, 5 figures, 2 tables. To be published in Eur.Phys.J.

    An asymptotic solution of conical shells of constant thickness Progress report no. 6

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    Asymptotic solution of thin walled conical shell of revolution under lateral stres
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