Transverse momentum dependence of η meson suppression in Au + Au collisions at sNN=200 GeV

Le résumé fourni par la source

New measurements by the PHENIX experiment at the Relativistic Heavy Ion Collider for $\ensuremath{\eta}$ production at midrapidity as a function of transverse momentum (${p}_{T}$) and collision centrality in $\sqrt{{s}_{\mathit{NN}}}=200$ GeV $\mathrm{Au}+\mathrm{Au}$ and $p+p$ collisions are presented. They indicate nuclear modification factors (${R}_{\mathrm{AA}}$) which are similar in both magnitude and trend to those found in earlier ${\ensuremath{\pi}}^{0}$ measurements. Linear fits to ${R}_{\mathrm{AA}}$ as a function of ${p}_{T}$ in 5--20 GeV$/c$ show that the slope is consistent with zero within two standard deviations at all centralities, although a slow rise cannot be excluded. Having different statistical and systematic uncertainties, the ${\ensuremath{\pi}}^{0}$ and $\ensuremath{\eta}$ measurements are complementary at high ${p}_{T}$; thus, along with the extended ${p}_{T}$ range of these data they can provide additional constraints for theoretical modeling and the extraction of transport properties.

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