2,808 research outputs found
Traces of Thermalization at RHIC
I argue that measurements of Au+Au collisions at 20, 130 and 200 GeV of the
centrality dependence of the mean p_t together with p_t and net-charge
fluctuations reflect the approach to local thermal equilibrium.Comment: 4 pages, 4 eps figures, for proc. Quark Matter 2004, to be published
in J. Phys.
Recent high pT measurements in STAR
After five years of data taking, the STAR experiment at the Relativistic
Heavy Ion Collider (RHIC) at Brookhaven National Laboratory provides precise
measurements of particle production at high transverse momentum in p-p, d-Au,
and Au-Au collisions at sqrt(s) = 200 GeV. We review recent results on the
flavor dependence of high pT particle suppression and hadron particle spectra
at sqrt(s) = 62.4 GeV. New results on two-particle angular correlations for
identified trigger particles and for low momentum associated charged hadrons in
p-p and Au-Au as well as near-side correlations will be presented
and discussed.Comment: 5th International Conference on Physics and Astrophysics of Quark
Gluon Plasma, Calcutta. 8 pages, 10 figures, submitted to J. Phys. G: Nucl.
Part. Phy
Recent results from the STAR spin program at RHIC
The STAR experiment uses polarized p+p collisions at RHIC to determine the
contributions to the spin of the proton from gluon spin and from orbital
angular momentum of the quarks and gluons. Selective STAR measurements of the
longitudinal double spin asymmetry for inclusive jet and inclusive hadron
production are presented here. In addition, we report measurements of the
transverse spin asymmetry for di-jet production at mid-rapidity and the
transverse single-spin asymmetry for forward pi0 productionComment: 4 pages, 5 figures, presented at GHP06 conferenc
Introduction to Library Trends 47 (2) Fall 1998: How Classifications Work: Problems and Challenges in an Electronic Age
published or submitted for publicatio
Particle dependence of elliptic flow in Au+Au collisions at 200 GeV
The elliptic flow parameter () for and
has been measured at mid-rapidity in Au + Au collisions at
GeV by the STAR collaboration. The values for both
and saturate at moderate , deviating
from the hydrodynamic behavior observed in the lower region. The
saturated values and the scales where the deviation begins are
particle dependent. The particle-type dependence of shows features
expected from the hadronization of a partonic ellipsoid by coalescence of
co-moving quarks. These results will be discussed in relation to the nuclear
modification factor () which has also been measured for and
by the STAR collaboration.Comment: 6 pages, 3 figures, Strange Quark Matter 2003 Conference (SQM 2003):
updated with 2 figures from original talk that did not appear in the journa
Novel Bose-Einstein Interference in the Passage of a Fast Particle in a Dense Medium
When an energetic particle collides coherently with many medium particles at
high energies, the Bose-Einstein symmetry with respect to the interchange of
the exchanged virtual bosons leads to a destructive interference of the Feynman
amplitudes in most regions of the phase space but a constructive interference
in some other regions of the phase space. As a consequence, the recoiling
medium particles have a tendency to come out collectively along the direction
of the incident fast particle, each carrying a substantial fraction of the
incident longitudinal momentum. Such an interference appearing as collective
recoils of scatterers along the incident particle direction may have been
observed in angular correlations of hadrons associated with a high-
trigger in high-energy AuAu collisions at RHIC.Comment: 10 pages, 2 figures, invited talk presented at the 35th Symposium on
Nuclear Physics, Cocoyoc, Mexico, January 3, 2012, to be published in IOP
Conference Serie
High pT correlations with strange particles in STAR
We present the highlights of the current identified strange particles
DeltaPhi and DeltaEta correlations analyses, including system-size and
trigger-pT of the jet and ridge, jet, ridge and away-side meson/baryon ratios,
and the current state of the multi-strange baryon analysis. We see clear
azimuthal peaks of comparable strength for all strange baryons and K0-short
mesons. We see no observable species dependence on the same-side jet or ridge
yields as a function of pT. However, while the away side and the ridge have
Lambda to K0-short ratio similar to that of the bulk, the jet-only ratio is
similar to that in . The implications of these findings on current
in-medium jet theoretical explanations are discussed.Comment: Proceedings for the Strangeness in Quark Matter 2007 Conference in
Levoca, Slovaki
As Hot as the Sun: Aztec Fevers, Medicine, and Magic in 16th-Century Mexico
Fevers had a significant presence in Mexico's sixteenth-century medical manuscripts, a consequence of the endemic and epidemic infections common to the pre and post-Hispanic eras. The distinctly Aztec conceptualization of these fevers invites further inquiry into the Aztec medical system. The Aztecs recognized multiple types of fevers, both natural and supernatural, manifesting in hot and cold forms. Thus, fevers can serve as a lens through which to examine the Aztecs' perception of the body and the universe, as well as the cosmic structure, dualities, and deities that governed the two. Furthermore, the animistic entities that connected the body to the divine also played a role in the development of fever. To address this state of disequilibrium, health practitioners relied upon their knowledge of the body, disease symptomology, and their vast pharmacopeia. In cases where a condition was suspected of having a supernatural etiology, these practitioners turned to magic
Open heavy flavor production at RHIC
The study of heavy flavor production in relativistic heavy ion collisions is
an extreme experimental challenge but provides important information on the
properties of the Quark-Gluon Plasma (QGP) created in Au+Au collisions at RHIC.
Heavy-quarks are believed to be produced in the initial stages of the
collision, and are essential on the understanding of parton energy loss in the
dense medium created in such environment. Moreover, heavy-quarks can help to
investigate fundamental properties of QCD in elementary p+p collisions. In this
work we review recent results on heavy flavor production and their interaction
with the hot and dense medium at RHIC.Comment: Quark Matter 2006 proceedings, 8 pages, 5 figure
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