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arXiv 2212.03561hep-ph
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寻找$a_0(980)$介子的部分子分布函数

Searching for $a_0(980)$-meson parton distribution function

Zai-Hui Wu, Hai-Bing Fu, Tao Zhong, Yu Chen, Ya-Hong Dai

AI总结:

该研究采用LCHO模型拟合$a_0(980)$介子光锥分布振幅矩,给出多标度领头扭度分布振幅、价夸克PDF及其Mellin矩和标度演化。

摘要:

本文利用光锥谐振子模型(LCHO)计算标量$a_0(980)$介子的领头扭度波函数。模型参数通过拟合其光锥分布振幅的$\xi$矩$\langle\xi_{a_0}^n\rangle_\zeta$来确定。随后给出三个不同标度$\zeta=(1.0,2.0,5.2)~{\rm GeV}$下的$a_0(980)$介子领头扭度光锥分布振幅。在建立$a_0(980)$介子领头扭度部分子分布函数/价夸克分布函数与其LCHO波函数之间的关系后,展示不同标度下的$q^{a_0}(x,\zeta)$和$x q^{a_0}(x,\zeta)$。此外,还计算$a_0(980)$介子价夸克分布函数在$n=(1,2,3)$时的Mellin矩$\langle x^n q^{a_0}\rangle_\zeta$,即$\langle x q^{a_0}\rangle_{\zeta_5}=0.026$、$\langle x^2 q^{a_0}\rangle_{\zeta_5}=0.017$和$\langle x^3 q^{a_0}\rangle_{\zeta_5}=0.012$。最后给出Mellin矩之比$x^n_{a_0}(\zeta,\zeta_k)$的标度演化。

英文摘要:

In this paper, we calculate the scalar $a_0(980)$-meson leading-twist wavefunction by using light-cone harmonic oscillator model (LCHO). In which the model parameters are determined by fitting the $ξ$-moments $\langleξ_{a_0}^n\rangle_ζ$ of its light-cone distribution amplitudes. Then, the $a_0(980)$-meson leading-twist light-cone distribution amplitudes with three different scales $ζ= (1.0, 2.0, 5.2)~{\rm GeV}$ are given. After constructing the relationship between $a_0(980)$-meson leading-twist parton distribution functions/valence quark distribution function and its LCHO wavefunction, we exhibit the $q^{a_0}(x,ζ)$ and $x q^{a_0}(x,ζ)$ with different scales. Furthermore, we also calculate the Mellin moments of the $a_0(980)$-meson's valence quark distribution function $\langle x^n q^{a_0}\rangle_ζ$ with $n = (1,2,3)$, i.e. $\langle x q^{a_0}\rangle_{ζ_5} = 0.026$, $\langle x^2 q^{a_0}\rangle_{ζ_5} = 0.017$ and $\langle x^3 q^{a_0}\rangle_{ζ_5} = 0.012$. Finally, the scale evolution for the ratio of the Mellin moments $x^n_{a_0}(ζ,ζ_k)$ are presented.

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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