Perturbative QCD and beyond: azimuthal angle correlations in deuteron-deuteron scattering from Bose-Einstein correlations

Abstract

In this paper, we found within the framework of perturbative QCD, that in deuteron-deuteron scattering the Bose-Einstein correlations due to two parton showers production, induce azimuthal angle correlations, with three correlation lengths: the size of the deuteron ($R_D$), the proton radius ($R_N$), and the size of the BFKL Pomeron which, is closely related to the saturation momentum ($R_c\sim 1/Q_s$). These correlations are independent of the values of rapidities of the produced gluons (long range rapidity correlations), for large rapidities ($\bas |y_1 - y_2| \geq 1$), and have no symmetry with respect to $\varphi \to \pi -\varphi$ (${\vec{p}}_{T1}\to -{\vec{p}}_{T1}$). Therefore, they give rise to $v_n$ for all values of $n$, not only even values. The contributions with the correlation length $R_D$ and $R_N$ crucially depend on the non-perturbative contributions, and to obtain estimates of their values, requiries a lot of modeling, while the correlations with $R_c\sim 1/Q_s$ have a perturbative QCD origin, and can be estimated in the ColorGlass Condensate (CGC) approach.

23pp, 18 figures in eps files

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Cited by in corpus (4)

• DPS in CGC: Double Quark Production and Effects of Quantum Statistics
• A CGC/saturation approach for angular correlations in proton-proton scattering
• Bose-Einstein correlations in perturbative QCD: $v_n$ dependence on multiplicity
• Azimuthal angle correlations at large rapidities: revisiting density variation mechanism