نتایج جستجو برای: matrix element
تعداد نتایج: 555879 فیلتر نتایج به سال:
A completely general method of analysis for three-dimensional raked piles under harmonic excitation is discussed. The piles have been represented by a three-dimensional frame structure and the soil has been represented by a boundary element discretization scheme. A computer program has been written which carries out this analysis and produces a group stiffness matrix that can be included as a f...
In [2] W. Rautenberg proved that (the content of) any 2–element matrix is finitely axiomatizable and asked if the same is true for any finite matrix. This conjecture was disproved by P. Wojtylak, who in [5] (see also [4]) costructed a 5–element matrix with 2 designated elements, which is not finitely axiomatizable. Recently, W. Dziobiak presented in [1] a 4–element algebraic matrix (i.e. a matr...
Measurement of the γ3π process has revealed a possible conflict with what should be a solid prediction generated by the chiral anomaly. We show that inclusion of appropriate energy-momentum dependence in the matrix element reduces the discrepancy. ∗ Research supported in part by the National Science Foundation.
We present a method to combine next-to-leading order (NLO) matrix elements in QCD with leading logarithmic parton showers by applying a suitably modified version of the phase-space-slicing method. The method consists of subsuming the NLO corrections into a scale-dependent phase-space-slicing parameter, which is then automatically adjusted to cut out the leading order, virtual, soft and collinea...
In this paper, we applied the matrix method to kinematic analysis of our translational 3-DOF (Degrees Of Freedom) micro parallel mechanism for an instance of general flexure mechanisms. The matrix method has been well developed in architecture to analyze a frame structure. We found that this method is well applicable to such a flexure mechanism with circular notched hinges as our micro parallel...
The calculation of the O(αs) virtual corrections to the matrix element of the inclusive decay b → sγ is reported. These contributions drastically reduce the large renormalization scale dependence of the leading logarithmic calculation. Combining these results with the preliminary result for the Wilson coefficient C7(mb) calculated recently by Chetyrkin, Misiak, and Münz, we estimate the branchi...
We study the two-body and three-body charmful baryonic B decays: B 0 → Λc p̄ and B → Λc p̄ π(ρ). The factorizable W -exchange contribution to B 0 → Λc p̄ is negligible. Applying the bag model to evaluate the baryon-to-baryon weak transition matrix element, we find B(B → Λc p̄) <∼ 1.1 × 10−5|gB0pΣ+b /6| 2 with gB0pΣ+ b being a strong coupling for the decay Σ+b → B 0 p and hence the predicted branchi...
Predictions based on the chirally normalized vector meson dominance model for decay rates and distributions of τ decays into Kππντ final states are discussed. Disagreements with experimental results can be traced back to the K1 widths. Hadronic τ decays into final states with kaons can provide detailed information about low energy hadron physics in the strange sector. Predictions for final stat...
We study the two-body and three-body charmful baryonic B decays: B 0 → Λc p̄ and B → Λc p̄ π(ρ). The factorizable W -exchange contribution to B 0 → Λc p̄ is negligible. Applying the bag model to evaluate the baryon-to-baryon weak transition matrix element, we find B(B → Λc p̄) <∼ 2.5 × 10−5|gB0pΣ+b /8| 2 with gB0pΣ+ b being a strong coupling for the decay Σb → B 0 p and hence the predicted branchin...
We have analysed the Ioffe-time distribution of quarks in virtual photons using Operator Product Expansion of the correlation function that determines the matrix element of the corresponding quark string operator. The distribution for a transversally polarised photon admits a spectral representation which can be continued to the on-shell region p = 0. The resulting model Ioffe-time distribution...
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