Jun 9 – 15, 2019
Bari, Italy
Europe/Zurich timezone

Sensitivity of heavy flavours to system size, structure and initial conditions.

Jun 11, 2019, 2:40 PM
Sala Europa (Villa Romanazzi Carducci)

Sala Europa

Villa Romanazzi Carducci

Contributed talk Heavy Flavour


Katz Roland (Subatech - Nantes)


Heavy flavour probes provide important information about the in-medium properties of the quark gluon plasma produced in heavy-ion collisions. In this work, we investigate the effects of (2+1)d event-by-event fluctuating hydrodynamic backgrounds on the nuclear suppression factor and momentum anisotropies of heavy flavour mesons and non-photonic electrons [1,2]. Using the state-of-the-art D and B mesons modular code (the so-called "DAB-mod"), updated recently with heavy-light quark coalescence, we perform a systematic comparison of different transport equations, including a few energy loss models and a relativistic Langevin model with different drag parametrizations [3]. To explore the effects of system size and structure on hard probes [4], we compare the D0 meson $R_{AA}$ and two-particle cumulants $v_2\{2\}$ and $v_3\{2\}$ for various colliding nuclei and energies: Au-Au$^{197}$ collisions at 200 GeV, Pb-Pb$^{208}$ collisions at 5.02 TeV, prolate and spherical Xe-Xe$^{129}$ collisions at 5.44 TeV [5], Ar-Ar$^{40}$ collisions at 5.85 TeV and O-O$^{16}$ collisions at 6.5 TeV and compare them to the latest experimental data. To investigate the sensitivity of hard probes to initial fluctuations, we compare MCKLN and Trento (tuned to IP-Glasma) initial conditions in Pb-Pb collisions at 5.02 TeV. We show the small dependence of the $R_{AA}$ , $v_2\{2\}$ and $v_3\{2\}$ observables over these initial fluctuations within our model, but also their strong impact on the trend of the multiparticle cumulant $v_2\{4\}/v_2\{2\}$ ratio as a function of centrality and its value in most central collisions. This ratio, known to be a probe of the initial conditions and flow fluctuations in the soft sector [6], is shown to be also driven in the hard sector by the system size and geometry [3]. We finally study the correlations and decorrelations of the heavy meson and all charged particle flows for different harmonics and compare our predictions with ALICE measurements of D meson $v_2$ vs bulk $q_2$ in Pb-Pb collisions at 5.02 TeV [7].

[1] C. Prado, J. Noronha-Hostler, R. Katz, A. Suaide, J. Noronha and M. Munhoz, Nucl. Phys. A 967 (2017) 664-667 [arXiv:1704.04654].
[2] C. Prado, J. Noronha-Hostler, R. Katz, A. Suaide, J. Noronha and M. Munhoz, Phys. Rev. C96 (2017) no.6, 064903 [arXiv:1611.02965].
[3] R. Katz, C. Prado, J. Noronha-Hostler, A. Suaide, J. Noronha and M. Munhoz, Hard Probes 2018 proceeding, Heavy-flavor dynamics in event-by-event viscous hydrodynamic backgrounds [arXiv:1812.08009].
[4] Z. Citron et al., ''Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams,'' [arXiv:1812.06772]
[5] See J. Noronha-Hostler’s talk at Santa Fe Jets and Heavy Flavor workshop 2019,
[6] P. Alba, V. Mantovani Sarti, J. Noronha, J. Noronha-Hostler, P. Parotto, I. Portillo Vazquez, and C. Ratti, Phys. Rev. C 98, 034909 (2018) [arXiv:1711.05207v2].
[7] See ALICE collaboration CERN-EP-2018-260 paper and R. Katz’s flash talk at Hard Probes for our preliminary predictions (https://indico.cern.ch/event/634426/contributions/3003663/)

Track Heavy Flavour

Primary author

Katz Roland (Subatech - Nantes)


Jacquelyn Noronha-Hostler (Rutgers University) Dr Caio Prado (Central China Normal University (CN)) Alexandre Alarcon Do Passo Suaide (Universidade de Sao Paulo (BR)) Jorge Noronha (University of Sao Paulo) Marcelo Gameiro Munhoz (Universidade de Sao Paulo (BR))

Presentation materials