737 research outputs found
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
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
Scaling properties of azimuthal anisotropy of mesons and baryons at RHIC
Detailed measurements of the azimuthal anisotropy (\v2) for identified
charged particles are reported as a function of transverse momentum () and
centrality for Au+Au collisions at \sqrtsNN = 200 GeV. The measurements
indicate clear evidence for eccentricity and particle flavor scaling over a
broad range of centralities and transverse rapidity , indicating a
hydrodynamical origin of the fine structure of azimuthal anisotropy at RHIC.
The observed scaling supports the picture of a suddenly hadronizing
(recombining) fluid of quarks. An apparent breaking of flavor scaling at
relatively large values of points to an important change in the mechanism
for particle emission.Comment: 21St Winter workshop on Nuclear Dynamic
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