High p(T) triggered Delta eta, Delta phi correlations over a broad range in Delta eta

摘要

The first measurement of pseudorapidity (Delta eta) and azimuthal angle (Delta phi) correlations between high transverse momentum charged hadrons (p(T) > 2.5 GeV/c) and all associated particles is presented at both short-(small Delta eta) and long- range ( large Delta eta) over a continuous pseudorapidity acceptance (-4 < Delta eta < 2). In these proceedings, the various near- and away-side features of the correlation structure are discussed as a function of centrality in Au+Au collisions measured by PHOBOS at root(NN)-N-S = 200 GeV. In particular, this measurement allows a much more complete determination of the longitudinal extent of the ridge structure, first observed by the STAR Collaboration over a limited. range. In central collisions the ridge persists to at least Delta eta = 4, diminishing in magnitude as collisions become more peripheral until it disappears around N-part = 80.