Ridge and Transverse Correlation without Long-Range Longitudinal Correlation

الملخص EN

A simple phenomenological relationship between the ridge distribution in Δη and the single-particle distribution in η can be established from the PHOBOS data on both distributions.

The implication points to the possibility that it is not necessary to have long-range longitudinal correlation to explain the data.

An interpretation of the relationship is then developed, based on the recognition that longitudinal uncertainty of the initial configuration allows for non-Hubble-like expansion at early time.

It is shown that the main features of the ridge structure can be explained in a model where transverse correlation stimulated by semihard partons is the principal mechanism.

This work is related to the azimuthal anisotropy generated by minijets in Au-Au collisions at 0.2 TeV on the one hand and to the ridge structure seen in pp collisions at 7 TeV on the other hand.