pT-dependent multiplicity fluctuations from PCA and initial conditions

We present a Principal Component Analysis for a hydrodynamic simulation and compare with CMS experimental data. While the results are reasonable for anisotropic flow, for multiplicity fluctuations they are qualitatively different. We argue that this is due to too large transverse momentum (p(T)) fluctuations and N - p(T) covariance in the simulation than seen experimentally. In turn this is related to too large initial size fluctuations.

Automated summary

This translation discusses a Principal Component Analysis conducted on a hydrodynamic simulation and compares it with experimental data from CMS. While the results for anisotropic flow are reasonable, they are qualitatively different for multiplicity fluctuations, possibly due to larger transverse momentum fluctuations and covariance in the simulation compared to experimental observations. This discrepancy could be related to excessive initial size fluctuations.