Gluon correlations from a Glasma flux-tube model compared to measured hadron correlations on transverse momentum $\bf (p_t,p_t)$ and angular differences $\bf (\eta_\Delta,\phi_\Delta)$

摘要

A Glasma flux-tube model has been proposed to explain strong elongation onpseudorapidity $\eta$ of the same-side 2D peak in minimum-bias angularcorrelations from $\sqrt{s_{NN}} = 200$ GeV \auau collisions. The same-sidepeak or "soft ridge" is said to arise from coupling of flux tubes to radialflow. Gluons radiated transversely from flux tubes are boosted by radial flowto form a narrow structure or ridge on azimuth. In this study we test theconjecture by comparing predictions for particle production, spectra andcorrelations from the Glasma model and conventional fragmentation processeswith measurements. We conclude that the Glasma model is contradicted bymeasured hadron yields, spectra and correlations, whereas a two-component modelof hadron production, including minimum-bias parton fragmentation, provides aquantitative description of most data, although $\eta$ elongation remainsunexplained.