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 1012.0453nucl-thhep-lathep-ph
收藏

两个核子观测量的夸克质量依赖性

On the Quark Mass Dependence of Two Nucleon Observables

Jiunn-Wei Chen, Tze-Kei Lee, C. -P. Liu, Yu-Sheng Liu

摘要:

研究了非物理轻夸克质量下S波核子-核子散射长度的格点量子色动力学测定的意义。结果表明,利用核有效场论(NEFT)不仅可以得到有效射程参数对夸克质量的依赖关系,而且可以得到所有低能氘核矩阵元对主导夸克质量的依赖关系。基于354 MeV π介子质量散射长度的NPLQCD格点计算和Beane,Kaplan和Vuorinen的NEFT功率计数方案,给出了氘电荷半径、磁矩、极化率和氘光致蜕变截面与夸克质量的关系.通过在较小的夸克质量下进行格点计算,可以得到进一步的改进。我们的结果可以用来约束u,d夸克质量mq的等谐组合随时间的变化,帮助人存原理研究寻找允许生命存在的mq范围,并为多重宇宙猜想提供一个弱检验。

英文摘要:

We study the implications of lattice QCD determinations of the S-wave nucleon-nucleon scattering lengths at unphysical light quark masses. It is found that with the help of nuclear effective field theory (NEFT), not only the quark mass dependence of the effective range parameters, but also the leading quark mass dependence of all the low energy deuteron matrix elements can be obtained. The quark mass dependence of deuteron charge radius, magnetic moment, polarizability and the deuteron photodisintegration cross section are shown based on the NPLQCD lattice calculation of the scattering lengths at 354 MeV pion mass and the NEFT power counting scheme of Beane, Kaplan and Vuorinen. Further improvement can be obtained by performing the lattice calculation at smaller quark masses. Our result can be used to constrain the time variation of isoscalar combination of u and d quark mass m_q, to help the anthropic principle study to find the m_q range which allows the existence of life, and to provide a weak test of the multiverse conjecture.

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。

↑