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arXiv 1108.5594hep-lathep-ph
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次首阶重强子手征微扰理论中的轴向耦合

Axial couplings in heavy hadron chiral perturbation theory at the next-to-leading order

William Detmold, C. -J. David Lin, Stefan Meinel

摘要:

本文计算了p区重强子手征微扰理论中次领先级的各种重介子态和重子态之间的轴流矩阵元。当与晶格计算或实验数据比较时,这些结果可用于确定手征拉格朗日量中的轴向耦合。我们的计算是在部分猝灭的手征微扰理论中进行的|2)和SU(6| 3)。我们将有限大小的影响所产生的一个单一的戈德斯通介子包裹周围的空间体积。通过取海夸克质量等于价夸克质量,可以直接得到具有两种和三种味的完整QCD的结果。为了说明我们的手征微扰理论计算对晶格计算的影响,我们详细分析了SU(2)全QCD结果。我们还研究了涉及末态Goldstone玻色子的重强子强衰变振幅的单圈贡献,并证明了这些振幅的夸克质量依赖性可以显着不同于仅包含单个强子外态的轴向电流矩阵元。

英文摘要:

We present calculations of axial-current matrix elements between various heavy-meson and heavy-baryon states to the next-to-leading order in heavy hadron chiral perturbation theory in the p-regime. When compared with data from lattice computations or experiments, these results can be used to determine the axial couplings in the chiral Lagrangian. Our calculation is performed in partially-quenched chiral perturbation theory for both SU(4|2) and SU(6|3). We incorporate finite-size effects arising from a single Goldstone meson wrapping around the spatial volume. Results for full QCD with two and three flavours can be obtained straightforwardly by taking the sea-quark masses to be equal to the valence-quark masses. To illustrate the impact of our chiral perturbation theory calculation on lattice computations, we analyse the SU(2) full QCD results in detail. We also study one-loop contributions relevant to the heavy hadron strong-decay amplitudes involving final-state Goldstone bosons, and demonstrate that the quark-mass dependence of these amplitudes can be significantly different from that of the axial current matrix elements containing only single hadron external states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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