Dipion decays of heavy baryons

Compared with the charmed baryons, the bottom baryons are not very well known, either experimentally Or theoretically. In this paper, we investigate the dipion strong decays of the P-wave and D-wave excited bottom baryons in the framework of the QPC model. We also extend the same analysis to the charmed baryons.

双π系统与J^(PC)=1^(-+)的奇特混杂态(英文)

基本的守恒定律要求IG(JPC) =1-(1-+ )的态和IG(JPC) =0 + (1-+ )的态都不能衰变到双π系统。文献 [17,18]提出的关于可以在双π系统中寻找 1-+ 混杂态的论点是不正确的。

Using X（3823）→J/ψπ＋π- to identify coupled-channel effects

Very recently, the Belle and BESIII experiments observed a new charmonium-like state X（3823）, which is a good candidate for tile D-wave charmonium （13D2）. Because the X（3823） is just near the DD＊ threshold, the decay X（3823）→J/ψπ＋π- can be a golden channel to test the significance of coupled-channel effects. In this work, this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion （QCDME） contributions. The partial decay width, the dipion invari^nt mass spectrum distribution dF[X（3823） →J/ψπ＋π- /dmπ＋π-, and the corresponding dF[X（3823） →J/ψπ＋π-/d cosθ distribution are computed. Many param- eters are determined from exi：sting experimental data, so the results depend mainly only on one unknown phase between the QCDME and hidden-charm dipion amplitudes.

原子核内的夸克分布——Ⅲ 双π态的分布函数

本文讨论了双π态的形成,它的分布函数,以及它对原子结构函数的贡献。结果表明双π态对原子核结构函数的贡献是不能忽略的。

原子核内夸克的分布——Ⅰ 原子核内的复杂现象(代引言)

概要地论述了EMC效应讨论的现状和问题,提出了进一步解决这一问题的方案。