2,660 research outputs found
High-p_T azimuthal correlations of neutral strange baryons and mesons in STAR at RHIC
We present results on two-particle azimuthal correlations of high-
neutral strange baryons (,) and mesons ()
associated with non-identified charged particles in d+Au and Au+Au collisions
at = 200 GeV. In particular, we discuss properties of the
near-side yield of associated charged particles as a function of centrality,
transverse momentum and , as well as possible baryon/meson and
particle/antiparticle differences. The results are compared to the proton and
pion triggered correlations and to fragmentation and recombination models.Comment: 3 pages, 2 figures, AIP proceedings of PANIC05 conference, Santa-Fe,
New Mexico, USA, October 24-28, 200
Elliptic Flow and Semi-hard Scattering at SPS
Results on elliptic flow and two-particle correlations in the semi-hard
regime are presented.Comment: 4 pages, 4 figures, 3 of which contain 2 eps file
Two and Three Particle Flavor Dependent Correlations
The PHENIX collaboration has developed novel methodologies for reliable
extraction of jet functions from two and three particle azimuthal correlation
functions measured at mid-rapidity in Au+Au collisions at GeV.
The extracted jet shape and the yield of jet-associated partner hadrons (per
trigger hadron) are found to vary with particle type and collision centrality,
indicating a significant effect of the nuclear collision medium on the (di)jet
fragmentation process.Comment: Proceedings for Quark Matter 2005 parallel tal
Elliptic flow contribution to two-particle correlations at different orientations to the reaction plane
Collective anisotropic particle flow, a general phenomenon present in
relativistic heavy-ion collisions, can be separated from direct
particle-particle correlations of different physics origin by virtue of its
specific azimuthal pattern. We provide expressions for flow-induced
two-particle azimuthal correlations, if one of the particles is detected under
fixed directions with respect to the reaction plane. We consider an ideal case
when the reaction plane angle is exactly known, as well as present the general
expressions in case of finite event-plane resolution. We foresee applications
for the study of generic two-particle correlations at large transverse momentum
originating from jet fragmentation.Comment: 5 pages, 3 figures, to be published as Rapid Communications in
Phys.Rev.C Re-submit paper to with small improvements in text for better
understanding, some minor changes in notation, and correcting one formula
where a summation was forgotten. One new reference, one reference to
conference report removed since full paper was already reference
High-pT strange particle spectra and correlations in STAR
We present results on strange particle production in p+p, d+Au and Au+Au
collisions at = 200 GeV. We discuss the nuclear modification
factors () and ratios of particle yields in order to investigate the
range of anomalous baryon production.The medium modification of the
fragmentation process is further explored by studying azimuthal correlations at
intermediate- for , and trigger
particles. The results are compared to fragmentation and recombination models.Comment: 4 pages, 3 figures. To appear in the proceedings of 2nd International
Conference on Hard and Electromagnetic Probes of High-Energy Nuclear
Collisions (HP2006), Asilomar, California, USA, June 9-16, 200
Anisotropic flow background to jet-correlation relative to reaction plane: A revisit of the mathematical framework
We derive the flow-background formula for jet-correlation analysis with high
pT trigger particles in any azimuth window relative to reaction plane,
extending the mathematic framework of previous study in [J. Bielcikova, et al.,
Phys. Rev. C 69 (2004) 021901(R)].Comment: 4 pages, 1 figure, published versio
Using two- and Three-particle correlations to probe strongly interacting partonic matter
The latest two- and three-particle correlation measurements obtained by the
PHENIX collaboration are presented. Three-particle correlations are consistent
with the presence of conical emission patterns in the data. Two-particle
correlations relative to the collision geometry reveal strong shape and yield
modifications of the away-side jet, that depend on the orientation of the
trigger particle with respect to the event plane. A difference in the geometry
dependence of the per trigger yields in the regions around and can be understood by a different
geometry dependence of jet energy loss and the medium response to the deposited
energy.Comment: 4 pages, 3 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennesse
Elliptic Flow arising from Ridges due to Semi-hard Scattering
Azimuthal anisotropy in heavy-ion collisions is studied by taking into
account the ridges generated by semi-hard scattering of intermediate-momentum
partons, which can be sensitive to the initial spatial configuration of the
medium in non-central collisions. In a simple treatment of the problem where
the recombination of only thermal partons is considered, analytical formulas
can be derived that yield results in accord with the data on v_2 for p_T <1-2
GeV/c. Centrality dependence is described by a geometrical factor. Ridge
phenomenology is used to determine the initial slopes of v_2 at low p_T for
both pion and proton. For higher p_T, shower partons from high-p_T jets must be
included, but they are not considered here.Comment: revised version with new title and expanded discussion, to be
published in Phys. Lett.
Jet Correlations of Identified Particles in PHENIX
Azimuthal two particle correlations at intermediate with one of the
particles identified have been measured at PHENIX. Trigger () baryons and mesons show little significant difference in the number of
associated particles () independent of centrality. For
inclusive hadron triggers with , associated
fragmentation particles with show a higher baryon to
meson ratio on the away side.Comment: talk given at Quark Matter 2004, 4 pages 4 figur
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