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We report first STAR measurement on two heavy-flavor particle correlations inp+p collisions at RHIC. Heavy-flavor (charm and bottom) events are identifiedand separated on a statistical basis by the azimuthal correlation of theirdecay electrons and open charm mesons, which yield important information aboutthe underlying production mechanism. The azimuthal correlation distributionexhibits a two-peak structure which can be attributed to B decays on thenear-side and predominantly charm pair production on the away-side. Theseassumptions are supported by dedicated simulations using PYTHIA and MC@NLOevent generators. This novel correlation technique will allow comprehensiveenergy-loss measurements of heavy quarks in heavy-ion collisions.

Heavy-flavor correlation measurements via electron azimuthal correlations with open charm mesons