arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.5255hep-ph
收藏

由π-π散射阈值参数的精确描述确定手征微扰理论低能常数

Determination of Chiral Perturbarion Theory low energy constants from a precise description of pi-pi scattering threshold parameters

Guillermo Rios, Jenifer Nebreda, Jose R. Pelaez

摘要:

我们报告我们确定的值的一个和两个回路的低能量常数出现在手征微扰理论计算的π-π散射振幅。为此,我们使用一个精确的总和规则确定的散射长度和斜率,出现在有效的范围扩展。此外,我们提供了新的总和规则和这些系数的值到三阶的扩展。我们的结果时,只使用的散射长度和斜率的S,P,D和F波与以前的测定是一致的,但似乎需要更高阶的贡献,如果他们要容纳的有效范围扩展的三阶系数。

英文摘要:

We report on our determination of the values of the one and two loop low energy constants appearing in the Chiral Perturbation Theory calculation of the pi-pi scattering amplitude. For this we use a precise sum rule determination of scattering lengths and slopes that appear in the effective range expansion. In addition we provide new sum rules and the values for these coefficients up to third order in the expansion. Our results when using only the scattering lengths and slopes of the S, P, D and F waves are consistent with previous determinations, but seem to require higher order contributions if they are to accommodate the third order coefficients of the effective range expansion.

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。

↑