The Solenoidal Tracker at RHIC (STAR) experiment at the Relativistic Heavy Ion Collider reports new measurements of jet quenching based on the semi-inclusive distribution of charged-particle jets recoiling from direct photon (gamma(dir)) and neutral pion (pi(0)) triggers in pp and central Au + Au collisions at root s(NN) = 200 GeV for triggers in the range 9 < E-T(trig) < 20 GeV. The datasets have integrated luminosities of 3.9 nb(-1) for Au + Au and 23 pb(-1) for pp collisions. Jets are reconstructed using the anti-k(T) algorithm with resolution parameters R = 0.2 and 0.5. The large uncorrelated jet background in central Au + Au collisions is corrected using a mixed-event approach, which enables precise charged-particle jet measurements at low transverse momentum p(T,jet)(ch) and large R. Recoil-jet distributions are reported in the range p(T,jet)(ch) < 25 GeV/c. Comparison of the distributions measured in pp and Au + Au collisions reveals strong medium-induced jet yield suppression for R = 0.2 with markedly less suppression for R = 0.5. Comparison is also made to theoretical models incorporating jet quenching. These data provide new insight into the mechanisms underlying jet quenching and the angular dependence of medium-induced jet-energy transport and provide new constraints on modeling such effects.
Semi-inclusive direct photon + jet and π0+jet correlations measured in p+p and central Au+Au collisions at sNN=200GeV
Fazio, S.;
2025-01-01
Abstract
The Solenoidal Tracker at RHIC (STAR) experiment at the Relativistic Heavy Ion Collider reports new measurements of jet quenching based on the semi-inclusive distribution of charged-particle jets recoiling from direct photon (gamma(dir)) and neutral pion (pi(0)) triggers in pp and central Au + Au collisions at root s(NN) = 200 GeV for triggers in the range 9 < E-T(trig) < 20 GeV. The datasets have integrated luminosities of 3.9 nb(-1) for Au + Au and 23 pb(-1) for pp collisions. Jets are reconstructed using the anti-k(T) algorithm with resolution parameters R = 0.2 and 0.5. The large uncorrelated jet background in central Au + Au collisions is corrected using a mixed-event approach, which enables precise charged-particle jet measurements at low transverse momentum p(T,jet)(ch) and large R. Recoil-jet distributions are reported in the range p(T,jet)(ch) < 25 GeV/c. Comparison of the distributions measured in pp and Au + Au collisions reveals strong medium-induced jet yield suppression for R = 0.2 with markedly less suppression for R = 0.5. Comparison is also made to theoretical models incorporating jet quenching. These data provide new insight into the mechanisms underlying jet quenching and the angular dependence of medium-induced jet-energy transport and provide new constraints on modeling such effects.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


