Hadron correlation in jets on the near and away sides of high-p{sub T} triggers in heavy-ion collisions

The correlation between the trigger and associated particles in jets produced on near and away sides of high-p{sub T} triggers in heavy-ion collisions is studied. Hadronization of jets on both sides is treated by thermal-shower and shower-shower recombinations. The energy loss of semihard and hard partons traversing the nuclear medium is parametrized in a way that renders a good fit of the single-particle inclusive distributions at all centralities. The associated hadron distribution in the near-side jet can be determined showing weak dependence on system size because of trigger bias. The inverse slope increases with trigger momentum in agreement with data. The distribution of associated particles in the away-side jet is also studied with careful attention given to antitrigger bias that is due to the longer path length that the away-side jet recoiling against the trigger jet must propagate in the medium to reach the opposite side. Centrality dependence is taken into account after determining a realistic probability distribution of the dynamical path length of the parton trajectory within each class of centrality. For symmetric dijets with p{sub T}{sup trig}=p{sub T}{sup assoc}(away), it is shown that the per-trigger yield is dominated by tangential jets. For unequal p{sub T}{sup trig}, p{sub T}{supmore » assoc}(near) and p{sub T}{sup assoc}(away), the yields are calculated for various centralities, showing an intricate relationship among them. The near-side yield agrees with data both in centrality dependence and in p{sub T}{sup assoc}(near) distribution. The average parton momentum for the recoil jet is shown to be always larger than that of the trigger jet for fixed p{sub T}{sup trig} and centrality and for any measurable p{sub T}{sup assoc}(away). With the comprehensive treatment of dijet production described here, it is possible to answer many questions regarding the behavior of partons in the medium under conditions that can be specified on measurable hadron momenta.« less