Tuesday, March 26, 2013

1303.5769 (John Novak et al.)

Determining Fundamental Properties of Matter Created in
Ultrarelativistic Heavy-Ion Collisions
   [PDF]

John Novak, Kevin Novak, Scott Pratt, Chris Coleman-Smith, Robert Wolpert
Posterior distributions for physical parameters describing relativistic heavy-ion collisions, such as the viscosity of the quark-gluon plasma, are extracted through a comparison of hydrodynamic-based transport models to experimental results from 100$A$ GeV + 100$A$ GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). By simultaneously varying six parameters and by evaluating several classes of observables, we are able to explore the complex intertwined dependencies of observables to model parameters. We obtain a full multi-dimensional posterior distribution for the model output given a large set of experimental observations, the methods developed here provide a range of acceptable values for each parameter, and reveal correlations between them. The breadth of observables and the number of parameters considered here go far beyond previous studies in this field. The statistical tools, which are based upon Gaussian Process emulators, are tested in detail and should be extendable to larger data sets and a higher number of parameters.
View original: http://arxiv.org/abs/1303.5769

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