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 Open Bottom Production in Au Au Collisions at √sNN = 200 GeV with the STAR Experiment

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 39 ◽  
Author(s):  
Shenghui Zhang
Keyword(s):  
Hadron Production ◽  
The Other ◽  
Heavy Flavor ◽  
Significance Level ◽  
Decay Channels ◽  
Nuclear Modification ◽  
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 s NN = 200 GeV by the STAR experiment. Specifically, measurements of nuclear modification factors for electrons, J / ψ , and D 0 from open bottom hadron decays, enabled by the Heavy Flavor Tracker, are shown. A large suppression for non-prompt J / ψ and non-prompt D 0 are observed at high transverse momenta. On the other hand, there seems to be less suppression for electrons from bottom hadron decays than for those from charm hadron decays at ∼ 2 σ significance level.

scholarly journals Quarkonium measurements in heavy-ion collisions with the STAR experiment

2018 ◽  
Vol 171 ◽  
pp. 18015
Author(s):  
Xinjie Huang
Keyword(s):  
Transverse Momentum ◽  
Nuclear Matter ◽  
Heavy Ion Collisions ◽  
Theoretical Calculations ◽  
Heavy Ion ◽  
Matter Effects ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Star Experiment ◽  
Nuclear Modification Factors

In these proceedings, we present the latest measurements of J/ψ and ϒ by the STAR experiment. The J/ψ and ϒ production measured in p+p collisions provide new baselines for similar measurements in Au+Au collisions, while the measurements in p+Au collisions can help quantify the cold nuclear matter effects. The J/ψ υ2 is measured in both U+U and Au+Au collisions to place constraints on the amount of J/ψ arising from recombination of deconfined charm and anti-charm pairs. Furthermore, the nuclear modification factors for ground and excited ϒ states as a function of transverse momentum and centrality are presented, and compared to those measured at the LHC as well as to theoretical calculations.

scholarly journals PHENIX results on open heavy flavor production

2018 ◽  
Vol 171 ◽  
pp. 18017
Author(s):  
Takashi Hachiya
Keyword(s):  
Minimum Bias ◽  
Heavy Flavor ◽  
Meson Decays ◽  
Nuclear Modification ◽  
Central Collisions ◽  
Single Electrons ◽  
Charm Hadron ◽  
Heavy Flavor Production

PHENIX measures the open heavy flavor productions in p + p, Cu+Au, and Au+Au collisions at [see formula in PDF] = 200 and 510 GeV using the silicon tracking detectors for mid- and forward rapidities. In Au+Au collisions, the nuclear modification of single electrons from bottom and charm hadron decays are measured for minimum bias and most central collisions. It is found that bottoms are less suppressed than charms in pT=3-5 GeV/c and charms in most central collisions are more suppressed than that in minimum bias collisions. In p + p and Cu+Au collisions, J/ψ from B meson decays are measured at forward and backward rapidities. The nuclear modification of B mesons in Cu+Au collisions is consistent with unity.

scholarly journals Nuclear modification factors ofϕmesons ind+Au,Cu+Cu, andAu+Aucollisions atsNN=200 GeV

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
A. Adare ◽  
S. Afanasiev ◽  
C. Aidala ◽  
N. N. Ajitanand ◽  
Y. Akiba ◽  
...  
Keyword(s):  
Nuclear Modification ◽  
200 Gev ◽  
Nuclear Modification Factors

scholarly journals Open-Charm Hadron Measurements in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment

Universe ◽  
2019 ◽  
Vol 5 (9) ◽  
pp. 196
Author(s):  
Jan Vanek
Keyword(s):  
D Mesons ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Open Charm ◽  
Strong Interactions ◽  
Heavy Flavor ◽  
Directed Flow ◽  
Charm Quarks ◽  
Charm Hadron ◽  
200 Gev

Study of the open-charm hadron production in heavy-ion collisions is crucial for understanding the properties of the Quark-Gluon Plasma. In these papers, we report on a selection of recent STAR measurements of open-charm hadrons in Au+Au collisions at s NN = 200 GeV , using the Heavy-Flavor Tracker. In particular, the nuclear modification factors of D 0 and D ± mesons, elliptic and directed flow of D 0 mesons, D s /D 0 and Λ c / D 0 yield ratios are discussed. The observed suppression of D 0 and D ± mesons suggests strong interactions of the charm quarks with the QGP. The measured elliptic flow of D 0 mesons is large and follows the NCQ scaling, suggesting that charm quarks may be close to thermal equilibrium with the QGP medium. Both D s /D 0 and Λ c / D 0 yield ratios are found to be enhanced in Au+Au collisions. The enhancement can be explained by models incorporating coalescence hadronization of charm quarks. In addition, the directed flow of the D 0 mesons is measured to be negative and larger than that of light-flavor mesons which is in a qualitative agreement with hydrodynamic model predictions with a tilted QGP bulk.

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