scholarly journals Measurements of heavy flavor and di-electron production at STAR

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Gang Wang
Keyword(s):  
Final Stage ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Flavor ◽  
Ion Collisions ◽  
Quark Interaction ◽  
Electron Production ◽  
Dense Nuclear Matter ◽  
Heavy Flavor Production ◽  
Electromagnetic Probes

AbstractHeavy quarks are produced early in the relativistic heavy ion collisions, and provide an excellent probe into the hot and dense nuclear matter created at RHIC. In these proceedings, we will discuss recent STAR measurements of heavy flavor production, to investigate the heavy quark interaction with the medium. Electromagnetic probes, such as electrons, provide information on the various stages of the medium evolution without modification by final stage interactions. Di-electron production measurements by STAR will also be discussed.

scholarly journals Highlights from PHENIX at RHIC

2018 ◽  
Vol 171 ◽  
pp. 01003
Author(s):  
Rachid Nouicer
Keyword(s):  
Heavy Quark ◽  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Dense Medium ◽  
Heavy Flavor ◽  
Theoretical Understanding ◽  
Rapidity Region ◽  
Ion Collisions

Hadrons conveying strange quarks or heavy quarks are essential probes of the hot and dense medium created in relativistic heavy-ion collisions. With hidden strangeness, ϕ meson production and its transport in the nuclear medium have attracted high interest since its discovery. Heavy quark-antiquark pairs, like charmonium and bottomonium mesons, are mainly produced in initial hard scattering processes of partons. While some of the produced pairs form bound quarkonia, the vast majority hadronize into particles carrying open heavy flavor. In this context, the PHENIX collaboration carries out a comprehensive physics program which studies the ϕ meson production, and heavy flavor production in relativistic heavy-ion collisions at RHIC. In recent years, the PHENIX experiment upgraded the detector in installing silicon vertex tracker (VTX) at mid-rapidity region and forward silicon vertex tracker (FVTX) at the forward rapidity region. With these new upgrades, the experiment has collected large data samples, and enhanced the capability of heavy flavor measurements via precision tracking. This paper summarizes the latest PHENIX results concerning ϕ meson, open and closed charm and beauty heavy quark production in relativistic heavy-ion collisions. These results are presented as a function of rapidity, energy and system size, and their interpretation with respect to the current theoretical understanding.

Understanding the unexpected suppression patterns at RHIC and LHC

2014 ◽  
Vol 29 (31) ◽  
pp. 1430035
Author(s):  
Magdalena Djordjevic ◽  
Marko Djordjevic
Keyword(s):  
Heavy Ion Collisions ◽  
D Mesons ◽  
Heavy Ion ◽  
Theoretical Framework ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Flavor ◽  
Major Goal ◽  
Neutral Pions ◽  
Single Electrons ◽  
Ion Collisions

Understanding properties of QCD matter created in ultra-relativistic heavy-ion collisions is a major goal of RHIC and LHC experiments. Suppression of light and heavy flavor observables is a powerful tool to understand these properties and the suppressions of underlying partons appear to suggest a clear hierarchy in the suppression of these observables. However, the measurements show significant qualitative differences between the observed and intuitively expected patterns, in particular for neutral pions and single electrons at RHIC and for charged hadrons and D mesons at LHC, which are denoted as heavy flavor puzzles at RHIC and LHC. In this review, we discuss these puzzles and also summarize evidence that they can be consistently explained within the same theoretical framework.

scholarly journals Erratum to: “Heavy-Flavor Production in pp and Heavy-Ion Collisions in QCD up to LHC Energies”

2011 ◽  
Vol 74 (1) ◽  
pp. 173-173 ◽  
Author(s):  
C. Merino ◽  
C. Pajares ◽  
M. M. Ryzhinskiy ◽  
Yu. M. Shabelski ◽  
A. G. Shuvaev
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Heavy Flavor ◽  
Ion Collisions ◽  
Heavy Flavor Production

scholarly journals Jet and heavy flavor production in heavy-ion collisions

2017 ◽  
Vol 289-290 ◽  
pp. 121-124
Author(s):  
Zhong-Bo Kang ◽  
Felix Ringer ◽  
Ivan Vitev
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Heavy Flavor ◽  
Ion Collisions ◽  
Heavy Flavor Production

scholarly journals An Experimental Review on Heavy-Flavorv2in Heavy-Ion Collision

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Md. Nasim ◽  
Roli Esha ◽  
Huan Zhong Huang
Keyword(s):  
Hadron Collider ◽  
Large Mass ◽  
Heavy Ion ◽  
Azimuthal Anisotropy ◽  
Relativistic Heavy Ion Collisions ◽  
Dense Medium ◽  
Heavy Flavor ◽  
Relativistic Heavy Ion Collider ◽  
Ion Collisions ◽  
Ion Collision

For over a decade now, the primary purpose of relativistic heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC) has been to study the properties of QCD matter under extreme conditions—high temperature and high density. The heavy-ion experiments at both RHIC and LHC have recorded a wealth of data in p+p, p+Pb, d+Au, Cu+Cu, Cu+Au, Au+Au, Pb+Pb, and U+U collisions at energies ranging fromsNN=7.7 GeV to 7 TeV. Heavy quarks are considered good probe to study the QCD matter created in relativistic collisions due to their very large mass and other unique properties. A precise measurement of various properties of heavy-flavor hadrons provides an insight into the fundamental properties of the hot and dense medium created in these nucleus-nucleus collisions, such as transport coefficient and thermalization and hadronization mechanisms. The main focus of this paper is to present a review on the measurements of azimuthal anisotropy of heavy-flavor hadrons and to outline the scientific opportunities in this sector due to future detector upgrade. We will mainly discuss the elliptic flow of open charmed meson (D-meson),J/ψ, and leptons from heavy-flavor decay at RHIC and LHC energy.

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 Experimental Overview on Heavy Flavor Production in Heavy Ion Collisions.

2018 ◽  
Vol 172 ◽  
pp. 04004
Author(s):  
Cesar L. da Silva
Keyword(s):  
Heavy Ion ◽  
High Energy ◽  
Mass Hierarchy ◽  
Heavy Flavor ◽  
Nuclear Collisions ◽  
Ion Collisions ◽  
Heavy Flavor Production ◽  
200 Gev ◽  
The Media ◽  
8 Tev

The use of probes containing heavy quarks is one of the pillars for the study of medium formed in high energy nuclear collisions. The conceptual ideas formulated more than two decades ago, such as quark mass hierarchy of the energy that the probe lose in the media and color screening of bound heavy quarkonia states, have being challenged by the measurements performed at RHIC and LHC. A summary of the most recent experimental observations involving charm and bottom quarks in pp, pA, and AA collisions from collisions energies extending from √sNN =200 GeV to 8 TeV is presented. This manuscript also discuss possibilities of new measurements which can be at reach with increased statistics and detector upgrades.

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