Speaker
Description
In heavy-ion collision experiments, the centrality of a collision is defined according to the transverse energy or number of tracks observed in a given detector. We propose a procedure to relate this experiment-defined centrality to the true centrality of the collision, defined according to impact parameter, in a way which does not need require the introduction of a Glauber model or the concept of participant nucleons. Our method allows to accurately reconstruct the probability distribution of impact parameter at a fixed value of the experiment-defined centrality, up to 5%. We argue that in central collisions, the fluctuations of impact parameter have specific signatures in the centrality dependence of the cumulants of elliptic flow, $v_2\{2\}$ and $v_2\{4\}$, and that these effects are clearly visible in experimental data.
Extension to proton-nucleus collisions is discussed (work in progress).
[Based on arXiv:1708.00081]
| Content type | Theory |
|---|---|
| Centralised submission by Collaboration | Presenter name already specified |
