Abstract
Two AdS/CFT based energy loss models are used to compute the suppression and azimuthal correlations of heavy quarks in heavy ion collisions. The model with a velocity independent diffusion coefficient is in good agreement with B and D meson data up to high pT. The partonic azimuthal correlations we calculate exhibit an order of magnitude difference in low momentum correlations to pQCD calculations [1]. We thus propose heavy flavour momentum correlations as a distinguishing observable of weaklyand strongly-coupled energy loss mechanisms.
Highlights
The quark gluon plasma is of great interest since it represents our first case study of the emergent physics of the non-abelian gauge theory QCD
Futhermore, we will probe the spectrum of their possible predictions with two plausible [6] ’t Hooft coupling constants (λ1 = 5.5 and λ2 = 12παs ≈ 11.3 with αs = 0.3) where for the former, temperature and the Yang-Mills coupling are equated, while for the latter constant, energy density and the coupling are equated. We will compare these with the pQCD based azimuthal correlations calculated in [1]
We have compared the azimuthal correlations predicted by pQCD and AdS/CFT based computations and found that, while the azimuthal correlations are qualitatively similar, the momentum correlations tell a different tale
Summary
The perturbative techniques of QCD are only adequate in a weakly coupled plasma, with calculations for strongly coupled plasmas constrained to methods like AdS/CFT-based approaches or Resonance Scattering [2] Both strong- and weak-coupling show qualitative agreement with RDAA [3], suggesting that they have attained sufficient maturity to compare them with more differential observables. Futhermore, we will probe the spectrum of their possible predictions with two plausible [6] ’t Hooft coupling constants (λ1 = 5.5 and λ2 = 12παs ≈ 11.3 with αs = 0.3) where for the former, temperature and the Yang-Mills coupling are equated, while for the latter constant, energy density and the coupling are equated We will compare these with the pQCD based azimuthal correlations calculated in [1]. We will compute the suppression of B and D mesons and compare with measurements from CMS [7] and ALICE [8] respectively
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