241. |
- Hornback, D., et al.
(författare)
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Measurements of heavy-quark production via single leptons at PHENIX
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- The measurement of single leptons from the semi-leptonic decay of heavy-flavor hadrons has long been a means for studying heavy-quark production. PHENIX has measured single muons in pp collisions at forward rapidity and single electrons in both pp and AuAu collisions at mid-rapidity at . The most recent PHENIX single lepton results are presented in the context of state-of-the-art pQCD calculations. An updated azimuthal anisotropy, v2(pT), measurement for heavy-flavor single electrons in AuAu collisions is also presented.
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242. |
- Huang, S., et al.
(författare)
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Measurements of high pt identified particles v1 and v2 in sqrt(s) = 200GeV Au-Au collisions
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
-
Tidskriftsartikel (refereegranskat)abstract
- The v2 and v4 of pions, kaons and protons have been measured by PHENIX in 200 GeV Au+Au collisions up to pT ~ 6 GeV/c and 4 GeV/c, respectively. The v4 of all these identified particles have been found to scale with the number of constituent quarks and all these particles have a similar v4/v22 ratio which is close to 0.9. The scaling behavior of v2 is studied at high pT and a deviation from the universal scaling is observed for transverse kinetic energy (KET/nq) higher than 1 GeV.
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243. |
- Issah, M., et al.
(författare)
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System size and beam energy dependence of azimuthal anisotropy from PHENIX
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
-
Tidskriftsartikel (refereegranskat)abstract
- We present azimuthal anisotropy measurements in Au+Au and Cu+Cu collisions at and 200 GeV. Comparison between reaction plane and cumulant v2 measurements in Au+Au collisions at GeV shows that non-flow contributions, originating mainly from jets, influence the extracted v2 for pT 3.5 GeV/c. Number of constituent quark (NCQ) scaling of v2, when studied as a function of transverse kinetic energy KET, is seen to hold for Au+Au collisions at and 200 GeV and for Cu+Cu collisions at GeV for KET 1 GeV. Differential hexadecupole flow v4 seems to exhibit scaling with integral v2 for centrality ≤40% as has been observed for differential v2.
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