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arXiv · 2201.13432

Nuclear transverse momentum imbalance in the color dipole approach at the LHC regime

F. G. Ben·A. V. Giannini·M. V. T. Machado
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Abstract

Transverse momentum broadening of a parton propagating through a large nucleus is evaluated in the color dipole approach using different models for the dipole cross section or unintegrated gluon distribution, which lead to different values of the coefficient $C_{\mathcal{F}}(0,s)$. Numerical calculations are compared to data extracted from LHCb and ALICE experiments for nuclear broadening of $J/\psi$. We find that different models which describe the small-$x$ data predict values of $\Delta p_T^2$ that agree reasonably well with experiment, specially for forward rapidity. The centrality dependence was also analysed and the models are consistent with the ALICE measurements.

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F. G. Ben, A. V. Giannini, M. V. T. Machado. 2022-01-31. Nuclear transverse momentum imbalance in the color dipole approach at the LHC regime. https://doi.org/10.1088/1361-6471%2Fac8b27

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