arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2412.08960hep-lathep-phnucl-th
收藏

物理夸克质量点附近八重态重子的磁极化率

Magnetic polarisability of octet baryons near the physical quark-mass point

Thomas Kabelitz, Waseem Kamleh, Derek Leinweber

AI总结:

本研究采用格点QCD背景场方法,通过识别剔除电淬灭规范场中的异常组态,首次在接近物理夸克质量点处计算八重态重子磁极化率,结果与手征微扰理论预期一致。

摘要:

本研究采用格点QCD背景场方法,在接近物理夸克质量点的条件下计算了八重态重子的磁极化率。这项首次计算得益于对异常组态的识别与剔除,该问题曾阻碍了此前的研究尝试。\n异常组态问题的根源在于电淬灭规范场组态上使用了Wilson型费米子作用量,其中动力学费米子规范场生成算法未考虑夸克的电荷。背景磁场中本会抑制部分规范场的费米子行列式变化被忽略,导致留下了会产生大加性质量重整化的非合理规范场,这类效应表现为关联函数分布中的显著离群值。本文描述了一种系统识别并移除这些异常组态的算法。\n研究发现轻的上夸克和下夸克存在问题,尤其是电荷更大的上夸克。奇异夸克更重的质量在一定程度上保护了超子关联函数,但这类组态同样能从异常组态移除中获益。在多数情况下,磁极化率的计算精度良好,结果与手征微扰理论预期的行为一致。

英文摘要:

The magnetic polarisabilities of octet baryons are calculated close to the physical quark-mass point using the background field method in lattice QCD. This first calculation draws on the identification and elimination of exceptional configurations that have hindered previous attempts. The origin of the exceptional configuration problem lies in the use of a Wilson-type fermion action on electro-quenched gauge field configurations, where the dynamical-fermion gauge-field generation algorithm the electric charges of the quarks. Changes in the fermion determinant that would suppress some gauge fields in the background magnetic field are neglected, leaving improbable gauge fields that generate large additive mass renormalisations which manifest as significant outliers in correlation-function distributions. An algorithm for the systematic identification and removal of these exceptional configurations is described. We find the light up and down quarks to be problematic, particularly the up quark with its larger electric charge. The heavier mass of the strange quark protects the hyperon correlation functions to some extent. However, these also benefit from the removal of exceptional configurations. In many cases, the magnetic polarisability is calculated with good precision. We find our results to be in accord with the behaviour anticipated by chiral perturbation theory.

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。

↑