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arXiv 1208.4513hep-phhep-ex
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TAUOLA中新强子流的理论输入和误差

Theoretical inputs and errors in the new hadronic currents in TAUOLA

P. Roig, I. M. Nugent, T. Przedzinski, O. Shekhovtsova, Z. Was

摘要:

在TAUOLA库中实现的新强子电流是在共振手征理论的统一和一致的框架中获得的:一种拉格朗日方法,其中强子τ衰变中交换的共振是以再现手征微扰理论的低能量结果的方式包含的活跃自由度。短程QCD对自旋为1的量子算符虚部的约束产生了耦合之间的关系,使理论具有预测性。在本通讯中,获得两个和三个介子的形状因子的草图。对我们的框架的一个批评是,误差可能高达1/3,因为它是在介子理论中实现QCD的大N_C极限。给出了一些不赞成指向较小误差的主张的论点,这将解释我们在这些衰变中描述的现象学成功。最后,其他次要的错误来源和目前的改进代码进行了讨论。

英文摘要:

The new hadronic currents implemented in the TAUOLA library are obtained in the unified and consistent framework of Resonance Chiral Theory: a Lagrangian approach in which the resonances exchanged in the hadronic tau decays are active degrees of freedom included in a way that reproduces the low-energy results of Chiral Perturbation Theory. The short-distance QCD constraints on the imaginary part of the spin-one correlators yield relations among the couplings that render the theory predictive. In this communication, the obtaining of the two- and three-meson form factors is sketched. One of the criticisms to our framework is that the error may be as large as 1/3, since it is a realization of the large-N_C limit of QCD in a meson theory. A number of arguments are given which disfavor that claim pointing to smaller errors, which would explain the phenomenological success of our description in these decays. Finally, other minor sources of error and current improvements of the code are discussed.

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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