论文标题
LHC的全链四夸克的分裂产生
Fragmentation production of fully-charmed tetraquarks at LHC
论文作者
论文摘要
$ x（6900）$共振最近在LHCB实验的Double-j/ψ$频道中发现，对揭开完全迷人的Tetraquark State的性质的强烈兴趣引起了人们的浓厚兴趣。本文的目的是提出一个独立于模型的理论框架，以研究这种新颖的外来had子的包容性产生，即由四个重夸克（通常称为$ t_ {4c} $）组成的共鸣，在大型$ p_t $ p_t $ p_t $ p_t $ p_t $ p_t $中。吸引渐近自由和事实$ m_c \ggλ_ {\ rm qcd} $，我们提出，可以将非定位但普遍的gluon-to-t-$ t_ {4c} $碎片函数分解为可扰动的可计算的短路系数和远程元素元素的元素的元素。我们在$α_s$和速度扩展中计算最低级的短距离系数。采用diquark ansatz大概估计那些尚不为NRQCD矩阵元素以及标准的QCD分解定理，我们预测$ t_ {4c/4b}（4c/4b}（0^{++}）$ t_ and $ t_ {4c/4b} $ pp at y y y y y y y y AT热切地等待着与未来LHC实验的对抗。
The $X(6900)$ resonance, very recently discovered in the double-$J/ψ$ channel at LHCb experiment, has spurred intensive interest in unravelling the nature of the fully charmed tetraquark state. The aim of this paper is to present a model-independent theoretical framework to study the inclusive production of this novel species of exotic hadrons, the resonances composed of four heavy quark (commonly referred to as $T_{4c}$), at large $p_T$ in hadron collision experiments. Appealing to asymptotic freedom and the fact $m_c\gg Λ_{\rm QCD}$, we propose that the nonpertubative yet universal gluon-to-$T_{4c}$ fragmentation function, can be decomposed into the product of the perturbatively calculable short-distance coefficient and the long-distance NRQCD matrix elements. We compute the short-distance coefficient at lowest-order in $α_s$ and velocity expansion. Adopting the diquark ansatz to roughly estimate those not-yet-known NRQCD matrix elements, together with the standard QCD factorization theorem, we predict the differential production rates for the $T_{4c/4b}(0^{++})$ and $T_{4c/4b}(2^{++})$ at large $p_T$ in $pp$ collision, which eagerly awaits the confrontation with the future LHC experiments.
