Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sNN=200 GeV: Jet quenching and the response of partonic matter

Le résumé fourni par la source

Azimuthal angle ($\ensuremath{\Delta}\ensuremath{\phi}$) correlations are presented for charged hadrons from dijets for $0.4<{p}_{T}<10$ GeV/$c$ in Au+Au collisions at $\sqrt{{s}_{\mathrm{NN}}}=200$ GeV. With increasing ${p}_{T}$, the away-side distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons to $p+p$ data suggest that the away-side can be divided into a partially suppressed ``head'' region centered at $\ensuremath{\Delta}\ensuremath{\phi}~\ensuremath{\pi}$ and an enhanced ``shoulder'' region centered at $\ensuremath{\Delta}\ensuremath{\phi}~\ensuremath{\pi}\ifmmode\pm\else\textpm\fi{}1.1$. The ${p}_{T}$ spectrum for the head region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the shoulder region is independent of centrality and trigger ${p}_{T}$, which offers constraints on energy transport mechanisms and suggests that it contains the medium response to energetic jets.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.