Abstract
We present a study of charm and beauty isolation based on a data-driven method with recent measurements on heavy flavor hadrons and their decay electrons in Au+Au collisions at sNN = 200 GeV at RHIC. The individual electron pT spectra, RAA and v2 distributions from charmed and beauty hadron decays are obtained. We find that the electron RAA from beauty hadron decays (RAAb→e) is suppressed in minimum bias Au+Au collisions but less suppressed compared with that from charmed hadron decays at pT > 3.5 GeV/c, which indicates that beauty quark interacts with the hot-dense medium with depositing its energy and is consistent with the mass-dependent energy loss scenario. For the first time, the non-zero electron v2 from beauty hadron decays (v2b→e) at pT > 3.0 GeV/c is observed and shows smaller elliptic flow compared with that from charmed hadron decays at pT < 4.0 GeV/c. At 2.5 GeV/c <pT < 4.5 GeV/c, v2b→e is smaller than a number-of-constituent-quark (NCQ) scaling hypothesis. This suggests that beauty quark is unlikely thermalized and too heavy to be moved in a partonic collectivity in heavy-ion collisions at the RHIC energy.
Highlights
The pursuit of Quark-Gluon Plasma (QGP) is one of the most interesting topics in strong interaction physics [1, 2, 3]
Studying the properties of the QGP matter and understanding its evolution in the early stage of the collisions are helpful for broadening our knowledge of the early born of the universe
Heavy quark masses, different from those of light quarks, are mostly coming from initial Higgs field coupling, which is hardly affected by the strong interactions [8]
Summary
The pursuit of Quark-Gluon Plasma (QGP) is one of the most interesting topics in strong interaction physics [1, 2, 3]. Heavy quarks are believed to be produced predominantly via hard scatterings in the early stage of the collisions and sensitive to the initial gluon density. Their total production yields can be calculated by perturbative-QCD (pQCD) [9] and are number of binary nucleon-nucleon collisions ( coll) scaled. Some attempts on the separation of charm and beauty contributions in HF decay electrons are only for from input branching ratio. Analysis Technique and Results another check, the input charmed hadron rapidity distributions with scanning the standard deviation in a range of 1.4
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