Abstract
The study of heavy flavor production in proton-nucleus and nucleus-nucleus collisions is a sensitive probe of the hot and dense matter created in such collisions. Installation of silicon vertex detectors in the PHENIX experiment, and increased performance of the BNL RHIC collider allowed collection of large amount of data on heavy flavor production in small colliding systems. In this talk we will present recent PHENIX results on open heavy flavor and quarkonia production in p+p, p+A, d+A, and He3+A colliding systems in a broad rapidity range, and discuss how these measurements help us to better understand all stages of nuclear collisions at high energy.
Highlights
In most genaral case the angular distribution of the positive lepton from the J/ψ decay can be written as d dN cos θdφ
If the beam circulating in the same direction as the J/ψ momentum is chosen (GJ forward), the resulting z-axis is nearly collinear with the z-axis of the HX and Collins-Soper frame (CS) frames and points in the same direction
Combinatorial and correlated background is subtracted bin-by-bin, and angular distributions are corrected for acceptance, which is calculated assuming no polarization, that is λθ = λθφ = λφ = 0
Summary
In most genaral case the angular distribution of the positive lepton from the J/ψ decay can be written as d dN cos θdφ. The three most common frames used in particle angular distribution studies are (Fig. 1): The Helicity frame (HX) [1], traditionally used in collider experiments, takes the z-axis as the spin-1 particle momentum direction
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