102,540 research outputs found

### The NLO QCD Corrections to $B_c$ Meson Production in $Z^0$ Decays

The decay width of $Z^0$ to $B_c$ 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

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.

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

Conical shells with linear thickness variation subjected to lateral normal load

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

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 $B_s\rightarrow D_s^{(*)}$ and their Applications to Semi-leptonic and Non-leptonic Decays

$B_s^0\rightarrow D_s^{-}$ and $B_s^0\rightarrow D_s^{*-}$ 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 $B_s^0\rightarrow
D_s^{(*)-}l^+\nu_l$ decays are also evaluated. We show that the calculated
decay rates agree well with the available experimental data. The longitudinal
polarization fraction of $B_s\rightarrow D_s^*V(A)$ decays are $\sim0.8$ when
$V(A)$ denotes a light meson, and are $\sim0.5$ when $V(A)$ denotes a $D_q$
($q=d,s$) meson.Comment: Final version published in J Phys. G 39 (2012) 045002 (Title also
changed

### Production of the $P$-Wave Excited $B_c$-States through the $Z^0$ Boson Decays

In Ref.[7],we have dealt with the production of the two color-singlet
$S$-wave $(c\bar{b})$-quarkonium states $B_c(|(c\bar{b})_{\bf 1}[^1S_0]>)$ and
$B^*_c(|(c\bar{b})_{\bf 1}[^3S_1]>)$ through the $Z^0$ boson decays. As an
important sequential work, we make a further discussion on the production of
the more complicated $P$-wave excited $(c\bar{b})$-quarkonium states, i.e.
$|(c\bar{b})_{\bf 1}[^1P_1]>$ and $|(c\bar{b})_{\bf 1}[^3P_J]>$ (with
$J=(1,2,3)$). More over, we also calculate the channel with the two color-octet
quarkonium states $|(c\bar{b})_{\bf 8}[^1S_0]g>$ and $|(c\bar{b})_{\bf
8}[^3S_1]g>$, whose contributions to the decay width maybe at the same order of
magnitude as that of the color-singlet $P$-wave states according to the naive
nonrelativistic quantum chromodynamics scaling rules. The $P$-wave states shall
provide sizable contributions to the $B_c$ production, whose decay width is
about 20% of the total decay width $\Gamma_{Z^0\to B_c}$. After summing up all
the mentioned $(c\bar{b})$-quarkonium states' contributions, we obtain
$\Gamma_{Z^0\to B_c} =235.9^{+352.8}_{-122.0}$ 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.

### $Z_0$ Boson Decays to $B^{(*)}_c$ Meson and Its Uncertainties

The programming new $e^{+}e^-$ collider with high luminosity shall provide
another useful platform to study the properties of the doubly heavy $B_c$ 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 $B_c$ and
the spin-triplet $B^*_c$ mesons through the $Z^0$ boson decays, where
uncertainties for the production are also discussed. Our results show
$\Gamma_{(^1S_0)}= 81.4^{+102.1}_{-40.5}$ KeV and
$\Gamma_{(^3S_1)}=116.4^{+163.9}_{-62.8}$ KeV, where the errors are caused by
varying $m_b$ and $m_c$ 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

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

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