The ridge laboratory

Abstract

Mechanisms proposed to explain the jet-related correlation of long range in rapidity (the ridge) observed in high-energy heavy-ion collisions are reviewed. Limitations of a model using the combined effect of transverse flow and a direction bias of partons suffering energy loss are discussed. The influence of the time scale of the correlation mechanism on the rapidity range is investigated.

Comments: Talk presented at 4th International Workshop High-pT physics at LHC 09, Prague, Feb. 4-7, 2009