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arXiv 1608.06231hep-ph
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光子-光子碰撞产生$J/ψ+ c + \bar{c}$的NLO修正

NLO QCD Corrections for $J/ψ+ c + \bar{c}$ Production in Photon-Photon Collision

Zi-Qiang Chen, Long-Bin Chen, Cong-Feng Qiao

摘要:

$γ+γ\rightarrow J/ψ+c+\bar{c}$包含过程是通过光子-光子散射产生$J/ψ$的一个极其重要的子过程,如在LEP \uppercase \expandafter{\romannumeral2}或各种类型的未来电子-正电子对撞机中。本文在非相对论QCD(NRQCD)分解的框架下,对这一过程进行了次领先(NLO)QCD修正,首次对两个射弹到三体夸克偶素包含的产生过程进行了NLO计算.通过将质心能量设置为LEP \uppercase \expandafter{\romannumeral2}、$\sqrt{s}=197$ GeV,我们在NLO精度下对该过程的$p_t^2$分布和总截面进行了分析。结果表明,总截面通过$K$因子约为1.46的非线性光学修正得到了适度的增强,从而减小了DELPHI数据与色单重态(CS)计算之间的差异,同时色八重态(CO)的贡献仍然不可避免。在未来的环形正负电子对撞机(CEPC),非线性光学修正被发现是更显着的,与$K$的因素约为1.76。

英文摘要:

The $γ+γ\rightarrow J/ψ+c+\bar{c}$ inclusive process is an extremely important subprocess in $J/ψ$ production via photon-photon scattering, like at LEP\uppercase\expandafter{\romannumeral2} or various types future electron-positron colliders. In this work we perform the next-to-leading(NLO) QCD corrections to this process in the framework of non-relativistic QCD(NRQCD) factorization formalism, the first NLO calculation for two projectiles to 3-body quarkonium inclusive production process. By setting the center-of-mass energy at LEP\uppercase\expandafter{\romannumeral2}, the $\sqrt{s}=197$ GeV, we conduct analyses of the $p_t^2$ distribution and total cross section of this process at the NLO accuracy. It turns out that the total cross section is moderately enhanced by the NLO correction with a $K$ factor of about 1.46, and hence the discrepancy between DELPHI data and color-singlet(CS) calculation is reduced while the color-octet(CO) contributions are still inevitable at this order. At the future Circular Electron-Positron Collider(CEPC), the NLO corrections are found to be more significant, with a $K$ factor of about 1.76.

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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