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arXiv 1808.06233hep-ph
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作为TMD胶子密度检验的在LHC的相关非即时$J/ψ+ μ$和$J/ψ+ J/ψ$产生

Associated non-prompt $J/ψ+ μ$ and $J/ψ+ J/ψ$ production at LHC as a test for TMD gluon density

S. P. Baranov, A. V. Lipatov, M. A. Malyshev

摘要:

我们用$k_T$ -因子分解方法研究了LHC中由$b$味强子衰变产生的$J/ψ$介子和μ子以及非瞬发双$J/ψ$产生.为了描述包含性的$b$ -强子衰变到不同的粲偶素态,我们采用碎裂方法,并采用基于非相对论QCD分解的碎裂函数。利用Catani-Ciafaloni-Fiorani-Marchesini方程和Kimber-Martin-Ryskin公式计算了质子中的横动量相关胶子密度。我们调查的影响来自部分子阵雨,估计的双重部分子散射的贡献,并比较我们的预测与第一个实验数据所采取的ATLAS和LHCb合作在$\sqrt s = 8$ ~TeV。这些数据可以作为对质子中TMD胶子密度函数的一个补充检验。

英文摘要:

We consider the associated production of $J/ψ$ mesons and muons originating from the $b$-flavored hadron decays and non-prompt double $J/ψ$ production at the LHC using the $k_T$-factorization approach. To describe the inclusive $b$-hadron decays into the different charmonium states we apply fragmentation approach and adopt fragmentation functions based on the non-relativistic QCD factorization. The transverse momentum dependent (TMD) gluon densities in a proton are determined using the Catani-Ciafaloni-Fiorani-Marchesini equation and Kimber-Martin-Ryskin prescription. We investigate the effects coming from parton showers, estimate the double parton scattering contribution and compare our predictions with the first experimental data taken by the ATLAS and LHCb Collaborations at $\sqrt s = 8$~TeV. These data can serve as an additional test for TMD gluon density function in a proton.

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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