Fragmentation production of fully-charmed tetraquarks at the LHC

Fragmentation production of fully-charmed tetraquarks at the LHC
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大型强子对撞机中完全魅力四夸克的碎片产生

DOI:
10.1103/physrevd.106.114029
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发表时间:
2020-09
期刊:
影响因子:
5
通讯作者:
Jia-Yue Zhang
Jia-Yue Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Feng Feng;Yingsheng Huang;Yu Jia;Wen-Long Sang;Xiaonu Xiong;Jia-Yue Zhang

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最近在LHCb实验的双J/psi通道中发现的X(6900)共振激发了人们对解开完全被迷住的四夸克态的性质的浓厚兴趣。本文的目的是提出一个与模型无关的理论框架来研究强子碰撞实验中这种奇异强子的包容产生,即由四个重夸克组成的共振态(通常称为$T_{4c}$)在大p_T$下的包容产生。利用渐近自由和m_c\gg \Lambda_{\rm QCD}$的事实,我们提出了非微扰但普适的胶子-T_{4c}$碎裂函数,可以分解为微扰可计算的短程系数和长程NRQCD矩阵元的乘积.我们在$\alpha_s$和速度展开中计算最低阶的短距离系数。采用双夸克对射法粗略估计了那些未知的NRQCD矩阵元,并结合标准QCD因子分解定理,预测了pp碰撞中大p T下$T_{4c/4 b}(0^{++})和$T_{4c/4 b}(2^{++})的微分产生率,这是我们期待与未来LHC实验对抗的结果。
The $X(6900)$ resonance, very recently discovered in the double-$J/\psi$ 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 $m_c\gg \Lambda_{\rm QCD}$, 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 $\alpha_s$ 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.
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