861 research outputs found
Event anisotropy of identified , photon and electron compared to charged , , and deuteron in = 200 GeV Au+Au at PHENIX
We report the recent results of event anisotropy analysis focused on in
= 200 GeV Au+Au collisions at PHENIX.Comment: 4 pages, 3 figures, contribution to the proceedings of the 17th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
(Quark Matter, Oakland, January 11-17, 2004). To appear in the proceedings
(Journal of Physics G
Measurement of Open Heavy Flavor Production with Single Muons in p+p and d+Au Collisions at RHIC
Heavy flavor production in hadronic collisions is dominated by gluonic
processes and so is a sensitive probe of the gluon structure function in the
nucleon and its modification in nuclei. A study of heavy flavor production in
p+p and d+Au collisions in various kinematic regions presents an opportunity to
probe cold nuclear medium effects; parton shadowing, color glass condensate,
initial state energy loss, and coherent multiple scattering in final state
interactions. The PHENIX muon arms cover both forward and backward directions
in the rapidity range of . We investigate single muon
production from open heavy flavor and light mesons decay in p+p and d+Au
collisions at forward and backward rapidity.Comment: Strangeness in Quark Matter, 2006, UCL
Excitation functions of baryon anomaly and freeze-out properties at RHIC-PHENIX
The intermediate region (2 - 5 GeV/) in central Au+Au collisions at
RHIC has a rich physics content. The (anti)proton to pion ratio at the
intermediate gives us a powerful tool to investigate the bulk properties
of the hot and dense matter created at RHIC and their hadronization processes.
We present the preliminary results of identified charged hadron spectra at the
lower beam energies at RHIC. The excitation function of (anti)proton to pion
ratios from SPS to RHIC are shown. We also discuss the onset of the baryon
enhancement at the high energy heavy ion collisions.Comment: 4 pages, 3 figures, Quark Matter 2006 conference proceeding
Strangeness and heavy flavor at RHIC: Recent results from PHENIX
We report recent results of strangeness and heavy flavor measurements from
PHENIX.
The topics are: Elliptic flow of strangeness and heavy flavor electron
production comparing to the other hadrons, meson production, and an
exotic particle search.Comment: 8 pages, 6 figures, 1 table. Submitted to J. Phys. G (Proceedings of
the 8th International Conference on Strangeness in Quark Matter, Cape Town,
South Africa, September 15-20, 2004
Heavy-Flavor Measurements by the PHENIX Experiment at RHIC
In recent years, PHENIX has studied many important observables related to
heavy-flavor physics through their leptonic decay measurements including the
invariant yield of electrons from nonphotonic sources, and prompt single muons,
both of which are dominated by D and B mesons. Charm and beauty cross-sections
were measured and compared through single lepton, and lepton-hadron
correlations in p+p collisions at = 200 GeV. Observables for
quarkonia production such as invariant yield and polarization were also
measured in p+p collisions. In Au+Au collisions, preliminary results for the
for single electrons and a 90% CL upper limit for the suppression of
s were produced. And in +Au collisions, a preliminary
study for production in different centrality ranges was extracted.Comment: 8 pages, 9 figures, International Conference on Strangeness in Quark
Matter Conference 2009 Proceeding
High p_T identified particles in PHENIX: data vs. theory
Two of the most interesting experimental results of heavy-ion reactions at
RHIC collider energies are in the hard scattering sector where central Au+Au
data show a very different behaviour compared to p+p and peripheral Au+Au
collisions. The so-called ``high p_T pi^0 suppression'' and the ``anomalous''
baryon/meson ratio observed by PHENIX in central Au+Au collisions at
sqrt(s_{NN}) = 200 GeV are reviewed and compared to various theoretical
calculations based on different strongly interacting medium scenarios.Comment: To appear in the proceedings of 19th Winter Workshop on Nuclear
Dynamics, Breckenridge, Colorado, US, March 8-15, 200
Charge Correlation in Near Side Hadron-Hadron Jets at sqrt(sNN)=200GeV in PHENIX
We analyze the relative azimuthal () distribution of same-charge
and opposite-charge particle pairs. We then remove elliptic flow background
using the ZYAM method. Comparisons between near angle peak widths
are presented for various centralities.Comment: Poster Proceedings from 2005 Quark Matter Conference. 4 Pages, 4
Figure
Some thoughts on di-jet correlation in Au + Au collisions from PHENIX
PHENIX has measured the two particle azimuth correlation in Au + Au at
= 200 GeV. Jet shape and yield at the away side are found to be
strongly modified at intermediate and low , and the modifications vary
dramatically with and centrality. At high , away side jet peak
reappears but the yield is suppressed. We discuss the possible physics pictures
leading to these complicated modifications.Comment: 3 pages, 2 figures. Contributed talk at PANIC '05 conference, Santa
Fe, NM, Oct24-28, 200
Direct Photon Measurement at RHIC-PHENIX
Results on direct photon measurements from the PHENIX experiment at RHIC are
presented. The direct photon yields for 6 GeV/ as a function of
centrality in Au-Au collisions at =200 GeV are found to be
consistent with NLO pQCD calculation scaled by the number of binary collisions.
The results suggest that the photons observed are emitted from the initial
stage of hard scattering. Comparisons with several theoretical calculations are
also presented.Comment: 8 pages, 13 figures. Proceedings for 21st Winter Workshop on Nuclear
Dynamics held in Breckenridge, Colorado, U.S.A., in Feburary, 200
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