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PHENIX has measured the azimuthal correlations of muon pairs from charm and bottom semi-leptonic decays in p+p collisions at s√=200 GeV, using a novel analysis technique utilizing both unlike- and like-sign muon pairs to separate charm, bottom and Drell-Yan contributions. The dimuon measurements combined with the previous electron-muon and dielectron measurements span a wide range in rapidity, and are well described by PYTHIA Tune A. Through a Bayesian analysis based on PYTHIA Tune A, we show that leading order pair creation is the dominant (76%±1419%) contribution for bb¯ production, whereas the data favor the scenario in which next-to-leading-order processes dominate cc¯ production. The small contribution of next-to-leading-order processes in bb¯ production at the collision energies of the Relativistic Heavy Ion Collider contrasts with the case at Large-Hadron-Collider energies, where next-to-leading-order processes are expected to dominate.


This is a pre-print of the article Aidala, C., Y. Akiba, M. Alfred, V. Andrieux, N. Apadula et al. "Correlations of μμ, eμ, and ee pairs in p+p collisions at s√=200 GeV and implications for cc¯ and bb¯ production mechanisms." arXiv preprint arXiv:1805.04075v1 (2019). Posted with permission.

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