Energy dependence of forward-backward transverse momentum correlation from STAR

Transverse momentum correlations could serve as a powerful probe of the early dynamics of hadronic interactions in heavy ion collisions. The related correlation coefficient is constructed from event-by-event average transverse momentum in two separated pseudorapidity regions. We present measurements of the average transverse momentum correlation coefficient $\rho$ in Au+Au collisions from 27 to 200 GeV at STAR. Results of forward-backward correlations are compared with correlations between adjacent pseudorapidity regions. The centrality and pseudorapidity separation dependence of transverse momentum correlations has been discussed.