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### Open heavy flavor and quarkonia measurements in heavy-ion collisions at RHIC

Bielcik Jaroslav
EPJ Web of conferences, 01 April 2014, Vol.70, p.00057 [Peer Reviewed Journal]
Directory of Open Access Journals (DOAJ)
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Title: Open heavy flavor and quarkonia measurements in heavy-ion collisions at RHIC
Author: Bielcik Jaroslav
Subject: Physics
Description: The properties of the hot and dense nuclear matter produced at RHIC in heavy-ion collisions can be investigated in multiple ways by heavy flavor production. The STAR and PHENIX experiments have excellent capability to study both open heavy flavor and quarkonia. Heavy quarks are produced in early stage of the collisions and the mechanisms of their interaction with nuclear matter are not yet well understood. The open heavy flavor hadrons can be studied using electrons from their semileptonic decays or via direct reconstruction through their hadronic decay channels. The heavy quarkonia production is expected to be sequentially suppressed depending on the temperature of the produced nuclear matter. However, cold nuclear matter effects play an important role and have to be well understood. In this paper we report recent results from the RHIC heavyion program on non-photonic electrons, direct reconstruction of charm mesons, J/ψ as well as ϒ in p+p, d+Au and Au+Au collisions at √sNN...
Is part of: EPJ Web of conferences, 01 April 2014, Vol.70, p.00057
Identifier: 2100-014X (E-ISSN); 10.1051/epjconf/20147000057 (DOI)
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### STAR heavy-flavor results

Bielcik, Jaroslav
arXiv.org, Jul 16, 2009
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
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Title: STAR heavy-flavor results
Author: Bielcik, Jaroslav
Contributor: Bielcik, Jaroslav (pacrepositoryorg)
Subject: Collisions ; Photonics ; Mesons ; Flavors
Description: A summary of the heavy flavor results from the STAR experiment is presented. Both open heavy flavor as well as quarkonia measurements are presented. A strong suppression of heavy flavor non-photonic electrons is observed in central Au+Au collisions at 200GeV. Relative contribution of bottom contribution to non-photonic electron spectra in p+p collisions is extracted from data. Nuclear modification factor of J/Psi mesons at high-pT is found to be consistent with one in central Cu+Cu collisions at 200GeV. Strong signal of Upsilon(1S+2S+3S) state is observed in d+Au collisions at 200GeV.
Is part of: arXiv.org, Jul 16, 2009
Identifier: 2331-8422 (E-ISSN)
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### STAR heavy-flavor results

Bielcik, Jaroslav
Cornell University
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Title: STAR heavy-flavor results
Author: Bielcik, Jaroslav
Subject: High Energy Physics - Experiment
Description: A summary of the heavy flavor results from the STAR experiment is presented. Both open heavy flavor as well as quarkonia measurements are presented. A strong suppression of heavy flavor non-photonic electrons is observed in central Au+Au collisions at 200GeV. Relative contribution of bottom contribution to non-photonic electron spectra in p+p collisions is extracted from data. Nuclear modification factor of J/Psi mesons at high-pT is found to be consistent with one in central Cu+Cu collisions at 200GeV. Strong signal of Upsilon(1S+2S+3S) state is observed in d+Au collisions at 200GeV. Comment: Presented at XVII International Workshop on Deep-Inelastic Scattering and Related Subjects, Madrid, 2009
Identifier: 0907.2816 (ARXIV ID)
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### The study of heavy flavors via non-photonic electrons in STAR

Bielcik, Jaroslav
arXiv.org, Oct 30, 2008
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
Available
Title: The study of heavy flavors via non-photonic electrons in STAR
Author: Bielcik, Jaroslav
Contributor: Bielcik, Jaroslav (pacrepositoryorg)
Subject: Quarks ; Quarks ; Electrons ; Collisions ; Partons ; Photonics ; Gluons ; Flavor (Particle Physics) ; Hadrons ; Transverse Momentum ; Dependence ; Energy Dissipation
Description: The strong suppression of hadrons with high transverse momenta in central Au+Au collisions observed at RHIC is generally interpreted as a consequence of energy loss of energetic partons in the hot and dense matter before fragmenting. The study of heavy quark production tests our understanding of energy loss mechanisms. Heavy quarks were expected to lose less energy in the medium than light quarks and gluons due to the suppression of small-angle gluon radiation. However, the high transverse momentum non-photonic electron spectra, which are dominated by semi-leptonic decays of heavy quarks, show a strong suppression in central Au+Au collisions as well. Current theoretical models do not satisfactory explain this observation. Preliminary non-photonic electron spectra are being extracted for Cu+Cu collisions at $$\sqrt{s_{NN}}$$ = 200 GeV. They are compared to the non-photonic electron yields from p+p and Au+Au collisions at the same collision energy. This provides a direct experimental test...
Is part of: arXiv.org, Oct 30, 2008
Identifier: 2331-8422 (E-ISSN)
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### The study of heavy flavors via non-photonic electrons in STAR

Bielcik, Jaroslav
Cornell University
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Title: The study of heavy flavors via non-photonic electrons in STAR
Author: Bielcik, Jaroslav
Subject: Nuclear Experiment
Description: The strong suppression of hadrons with high transverse momenta in central Au+Au collisions observed at RHIC is generally interpreted as a consequence of energy loss of energetic partons in the hot and dense matter before fragmenting. The study of heavy quark production tests our understanding of energy loss mechanisms. Heavy quarks were expected to lose less energy in the medium than light quarks and gluons due to the suppression of small-angle gluon radiation. However, the high transverse momentum non-photonic electron spectra, which are dominated by semi-leptonic decays of heavy quarks, show a strong suppression in central Au+Au collisions as well. Current theoretical models do not satisfactory explain this observation. Preliminary non-photonic electron spectra are being extracted for Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV. They are compared to the non-photonic electron yields from p+p and Au+Au collisions at the same collision energy. This provides a direct experimental test of the dependence of the non-photonic electron yield on collision system size. Comment: ICHEP 08, 3 pages, 1 figure
Identifier: 0810.5456 (ARXIV ID)
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### Heavy flavor physics at STAR

Bielcik, Jaroslav
Cornell University
Available
Title: Heavy flavor physics at STAR
Author: Bielcik, Jaroslav
Subject: Nuclear Experiment
Description: In these proceedings, heavy flavor production as measured by STAR is disscussed. This can be done directly by reconstruction of the hadronic decays or indirectly by the measurement of electrons from semileptonic decays of heavy quark mesons. The extracted charm production total cross-section per nucleon-nucleon collision in d+Au and Au+Au collisions shows binary scaling, supporting the idea that charm quarks are produced in hard scattering in the initial phase of the collision. The preliminary non-photonic electron spectra from $p+p$, $d+Au$ and $Au+Au$ collisions at $\sqrt{s_{NN}}=200$ GeV at mid-rapidity are presented. The momentum range of reconstructed non-photonic electrons is $1.5 < p_{T}< 10$ GeV/c. The dominant contribution to the non-photonic electron spectrum is the semi-leptonic decay of D and B mesons. The electron nuclear modification factor ($R_{AA}$) shows a large suppression in central Au+Au collisions, indicating an unexpectedly large energy loss for heavy quarks in the hot and dense matter created at RHIC. Theoretical models tend to overpredict the data if the contributions from both charm and beauty decays are taken into account. Comment: Presented at Rencontres de Moriond, QCD and high energy hadronic interactions, 18-25 March 2006, La Thuile, Italy (5 pages, 2 figures)
Identifier: nucl-ex/0606010 (ARXIV ID)
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### Heavy flavor physics at STAR

Bielcik, Jaroslav
arXiv.org, Jun 5, 2006
© ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
Available
Title: Heavy flavor physics at STAR
Author: Bielcik, Jaroslav
Contributor: Bielcik, Jaroslav (pacrepositoryorg)
Subject: Quarks ; Quarks ; Electrons ; Collisions ; Charm (Particle Physics) ; Photonics ; Flavor (Particle Physics) ; Decay ; Mesons ; Accident Reconstruction ; Energy Dissipation
Description: In these proceedings, heavy flavor production as measured by STAR is disscussed. This can be done directly by reconstruction of the hadronic decays or indirectly by the measurement of electrons from semileptonic decays of heavy quark mesons. The extracted charm production total cross-section per nucleon-nucleon collision in d+Au and Au+Au collisions shows binary scaling, supporting the idea that charm quarks are produced in hard scattering in the initial phase of the collision. The preliminary non-photonic electron spectra from $$p+p$$, $$d+Au$$ and $$Au+Au$$ collisions at $$\sqrt{s_{NN}}=200$$ GeV at mid-rapidity are presented. The momentum range of reconstructed non-photonic electrons is $$1.5 < p_{T}< 10$$ GeV/c. The dominant contribution to the non-photonic electron spectrum is the semi-leptonic decay of D and B mesons. The electron nuclear modification factor ($$R_{AA}$$) shows a large suppression in central Au+Au collisions, indicating an unexpectedly large energy loss for heavy quarks...
Is part of: arXiv.org, Jun 5, 2006
Identifier: 2331-8422 (E-ISSN)
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