Fragmentation of the fireball and how to observe it

TL;DR

This paper proposes that fragmentation during hadronisation in ultrarelativistic nuclear collisions can explain observed phenomena like the HBT puzzle, and suggests ways to detect it through event-wise rapidity differences and proton-proton correlations.

Contribution

It introduces the idea that bulk viscosity singularity-driven fragmentation can explain the HBT puzzle and proposes observable signatures for this scenario.

Findings

Fragmentation can explain the HBT puzzle.

Event-wise rapidity differences indicate fragmentation.

Proton-proton rapidity correlations support the scenario.

Abstract

We argue that fragmentation at hadronisation is likely scenario in ultrarelativistic nuclear collisions. In case of crossover phase transition it is driven by a singularity of the bulk viscosity. We claim that such a scenario can explain the ``HBT puzzle'' and can be identified by non-statistical differences between event-wise rapidity distributions and by proton-proton rapidity correlations.