Speaker
Description
We study the effect of the early stage of heavy-ion collisions on the transport of heavy quarks, by extracting two-particle correlations and nuclear modification factor [1]. We perform numerical simulations for both the temporal evolution of the initial state Glasma fields and the propagation of classical test particles in these background fields [2].
Firstly, we simulate how $Q\overline{Q}$ pairs initially produced back-to-back propagate in the Glasma and compute their two particle correlations $\mathcal{C}(\Delta\phi,\Delta\eta)$. Such a quantity is relevant for experimentally measured $D\overline{D}$ correlations. We extract the azimuthal $\sigma_{\Delta\phi}$ and rapidity $\sigma_{\Delta\eta}$ correlation widths. We study the initial quark $p_T$ and Glasma saturation momentum $Q_s$ dependence and notice dramatic decorrelations for moderate $p_T$ and $Q_s$ values.
Secondly, we initialize heavy quark $p_T$-spectra according to FONLL heavy quark production and measure how the Glasma affects the nuclear modification factor $R_{AA}$. We find that the Glasma shifts the initial spectra from low to high-$p_T$, causing an enhancement in $R_{AA}$ at larger-$p_T$. We investigate how this is affected by varying $Q_s$, along with switching between proton PDFs and nuclear nPDFs in the FONLL calculation.
[1] D. Avramescu, V. Greco, T. Lappi, H. Mäntysaari, D. Müller - in preparation
[2] D. Avramescu, V. Băran, V. Greco, A. Ipp, D. Müller, M. Ruggieri - Phys. Rev. D 107, 114021
| Category | Theory |
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