Measurements of open heavy flavor in STAR experiment

2014 ◽  
Vol 932 ◽  
pp. 45-50 ◽  
Author(s):  
Zhenyu Ye
Keyword(s):  
Heavy Flavor ◽  
Star Experiment

scholarly journals Production of Open-Charm Hadrons in AuAu Collisions at sNN=200GeV Mesured by the STAR Experiment +†

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 10 ◽  
Author(s):  
Jan Vanek
Keyword(s):  
Charm Quark ◽  
Heavy Ion ◽  
Open Charm ◽  
Hadronic Decay ◽  
Relativistic Heavy Ion Collisions ◽  
Supervised Machine Learning ◽  
Machine Learning Techniques ◽  
Heavy Flavor ◽  
Quark Interaction ◽  
Star Experiment

Charm quarks are primarily produced at the early stages of ultra-relativistic heavy-ion collisions and can therefore probe the quark-gluon plasma throughout its whole evolution. Final-state open-charm hadrons are commonly used to experimentally study the charm quark interaction with the medium. Thanks to the excellent secondary vertex resolution provided by the Heavy Flavor Tracker, STAR is able to directly reconstruct D ± , D 0 , D s , and Λ c ± via their hadronic decay channels. The topological cuts for signal extraction are optimized using supervised machine learning techniques. In these proceedings, we present an overview of recent open charm results from the STAR experiment. The nuclear modification factors of open-charm mesons and Λ c ± /D 0 ratio are shown as functions of transverse momentum and collision centrality.

scholarly journals Open Bottom Production in Au+Au Collisions at s NN = 200 GeV with the STAR Experiment

2018 ◽  
Vol 46 ◽  
pp. 1860014 ◽  
Author(s):  
Shenghui Zhang
Keyword(s):  
Heavy Flavor ◽  
Vertex Detector ◽  
Significance Level ◽  
Decay Channels ◽  
Nuclear Modification ◽  
Decay Products ◽  
Charm Hadron ◽  
200 Gev ◽  
Star Experiment ◽  
Nuclear Modification Factors

In these proceedings, we present measurements of open bottom hadron production through multiple decay channels in Au+Au collisions at [Formula: see text] = 200 GeV by the STAR experiment. Namely, measurements of nuclear modification factors for electrons, [Formula: see text], and [Formula: see text] from open bottom hadron decays are shown. The decay products are topologically identified utilizing the Heavy Flavor Tracker, a silicon vertex detector installed at STAR during the period of 2014 - 2016. It enables precise reconstruction of displaced decay vertices. The results show large suppression for non-prompt [Formula: see text] and non-prompt [Formula: see text] at high transverse momenta, and indicate less suppression for electrons from bottom hadron decays than for those from charm hadron decays at [Formula: see text] significance level.

scholarly journals Recent highlights from STAR

2018 ◽  
Vol 171 ◽  
pp. 01004
Author(s):  
Wangmei Zha
Keyword(s):  
Quark Matter ◽  
Heavy Ion Collisions ◽  
Star Collaboration ◽  
Heavy Ion ◽  
Particle Identification ◽  
Heavy Flavor ◽  
Ion Collisions ◽  
Star Experiment ◽  
Electro Magnetic ◽  
Magnetic Probes

The Solenoidal Tracker at RHIC (STAR) experiment takes advantage of its excellent tracking and particle identification capabilities at mid-rapidity to explore the properties of strongly interacting QCD matter created in heavy-ion collisions at RHIC. The STAR collaboration presented 7 parallel and 2 plenary talks at Strangeness in Quark Matter 2017 and covered various topics including heavy flavor measurements, bulk observables, electro-magnetic probes and the upgrade program. This paper highlights some of the selected results.

scholarly journals Measurements of open charm production and flow in √sNN = 200GeV Au+Au collisions with the STAR experiment at RHIC

2018 ◽  
Vol 192 ◽  
pp. 00015
Author(s):  
Spyridon Margetis
Keyword(s):  
Transport Model ◽  
Supervised Machine Learning ◽  
Heavy Flavor ◽  
Strong Suppression ◽  
Data Set ◽  
Model Calculations ◽  
Central Collisions ◽  
200 Gev ◽  
Star Experiment ◽  
Signal Significance

We present an improved, higher statistics, measurement with respect to the previously published results of the D0 meson elliptic flow (v2) as a function of transverse momentum (pT) in Au+Au collisions at √sNN = 200 GeV with the STAR Heavy Flavor Tracker (HFT). The D0 v2 results are compared to those of light-flavor hadrons to test the number-of-constituent-quark (NCQ) scaling. They are also compared to recent hydrodynamic and transport model calculations. We also report on the updated measurements of D0 nuclear modification factors RAA and RCP using the 2014 data. The measured D0 RAAin central collisions is less than 1 across the entire pT region. The D0 yields show strong suppression at high pT (> 6 GeV/c) in central collisions, consistent with those of light flavor hadrons. We also report the measurements of collision centrality and pT dependences of the Λ±c production in Au+Au collisions at √sNN = 200 GeV, using the HFT. The Λ±c signal significance is greatly improved with the addition of the highstatistics data set collected in 2016 and the use of a supervised machine learning method for a more effcient topological reconstruction of the decay vertices. The measured Λ±c/D0 ratio in 10-80% Au+Au collisions shows a significant enhancement compared to the PYTHIA prediction for p + p collisions, across the measured pT range.

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