Speaker
Description
We present the first self-consistent, first-principles, event-by-event framework for high-$p_T$ hadron production that incorporates correlated hard and soft particle production within a single theoretical approach. Using IP-Glasma, the model simultaneously generates the hard $\sim 10$ GeV gluon spectrum and the soft $\lesssim 3$ GeV gluon multiplicity, both subsequently hadronized, enabling a consistent treatment of centrality bias in both large and small systems. With parameters constrained by a previous Bayesian analysis of HERA data, we present predictions for the centrality-dependent nuclear modification factor in $\text{Pb} +\text{Pb}$, $p + \text{Pb}$, and $p + p$ collisions, finding good agreement with experimental trends from initial state physics. We further show that constraints from measured charged-particle multiplicity fluctuations across systems provide additional restrictions on the predicted nuclear modification factor. While the resulting $R_{pPb}$ is in good qualitative agreement with data, the model overshoots the measurements in the most central collisions, leaving room for final-state energy loss. Finally, we present predictions for the effects of centrality bias in $\text{O} + \text{O}$ and $\text{Ne} + \text{Ne}$ collisions.
| Is this an experimental talk? | No |
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| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |