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arXiv 2102.09118hep-ph
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共线分解中改进的颜色蒸发模型中$J/ψ$到${\mathcal O}(α_s^3)$的直接生成和极化

Production and polarization of direct $J/ψ$ to ${\mathcal O}(α_s^3)$ in the improved color evaporation model in collinear factorization

Vincent Cheung, Ramona Vogt

摘要:

在改进的颜色蒸发模型中,我们用共线分解方法计算了直接$J/ψ$在$\mathcal{O}(α_s^3)$的产生和偏振。我们提出的第一个计算的偏振参数$λ_\vartheta$,$λ_ϕ$,和$λ_{\vartheta ϕ}$的螺旋度和柯林斯-Soper框架,以及框架不变的偏振参数$\tildeλ$作为横向动量的函数。我们发现协议与$J/ψ$截面和不变的偏振参数在小和中等$p_T$。

英文摘要:

We calculate the production and polarization of direct $J/ψ$ in the improved color evaporation model at $\mathcal{O}(α_s^3)$ in the collinear factorization approach. We present the first calculation of polarization parameters $λ_\vartheta$, $λ_ϕ$, and $λ_{\vartheta ϕ}$ in the helicity and the Collins-Soper frames, as well as the frame-invariant polarization parameter $\tildeλ$ as a function of transverse momentum. We find agreement with both $J/ψ$ cross sections and the invariant polarization parameters at small and moderate $p_T$.

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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