Azimuthal di-hadron correlations in d+ Au and Au + Au collisions at sNN=200 GeV measured at the STAR detector

Le résumé fourni par la source

Yields, correlation shapes, and mean transverse momenta ${p}_{T}$ of charged particles associated with intermediate- to high-${p}_{T}$ trigger particles ($2.5<{p}_{T}<10$ GeV/$c$) in $d+$ Au and Au $+$ Au collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV are presented. For associated particles at higher ${p}_{T}\ensuremath{\gtrsim}2.5$ GeV/$c$, narrow correlation peaks are seen in $d+$ Au and Au $+$ Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle ${p}_{T}<2$ GeV/$c$, a large enhancement of the near- ($\ensuremath{\Delta}\ensuremath{\phi}~0$) and away-side ($\ensuremath{\Delta}\ensuremath{\phi}~\ensuremath{\pi}$) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au $+$ Au collisions compared to $d+$ Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at $\ensuremath{\Delta}\ensuremath{\phi}~\ensuremath{\pi}$ in central Au $+$ Au collisions.

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