649 research outputs found
Bulk Properties in Au+Au Collisions at = 9.2 GeV in STAR Experiment at RHIC
One of the primary goals of high-energy heavy-ion collisions is to establish
the QCD phase diagram and search for possible phase boundaries. The planned
RHIC energy scan program will explore this exciting physics topic using
heavy-ion collisions at various center of mass energies. The first test run
with Au+Au collisions at = 9.2 GeV took place in early 2008. We
present the results on identified particle ratios, azimuthal anisotropy
parameters (v1 and v2) and HBT at midrapidity using data from this run. These
results are compared to data for both lower and higher center of mass energies
at the AGS, SPS and RHIC. These new data demonstrate the capabilities of the
STAR detector for exploring the QCD phase diagram.Comment: 4 pages, 2 figures: Re-submitted to appear in proceedings for Quark
Matter 2009, March 30 - April 4, Knoxville, Tennesse
Transition from Baryonic to Mesonic Freeze-Out
The recently discovered sharp peak in the K+/pi+ ratio is discussed in the
framework of the statistical model. In this model a rapid change is expected as
the hadronic gas undergoes a transition from a baryon-dominated to a
meson-dominated gas. The transition happens at sqrt{s_{NN}} = 8.16 GeV,
temperature T = 140 MeV and baryon chemical potential mu_B = 410 MeV. The
maximum in the Lambda/pi ratio is well reproduced by the statistical model, but
the change in the K+/pi+ ratio is much less pronounced than the one observed by
the NA49 collaboration. Further experimental tests are proposed to clarify the
nature of the transition. In particular, the maxima expected in the statistical
model for the Xi/pi and Omega/pi ratios occur at slightly higher beam energies
than the maxima for the Lambda/pi and K+/pi+ ratios.Comment: 5 pages, 5 postscript figures, uses elsart.st
Transverse Energy per Charged Particle and Freeze-Out Criteria in Heavy-Ion Collisions
In relativistic nucleus-nucleus collisions the transverse energy per charged
particle, E_T/N_ch, increases rapidly with beam energy and remains
approximately constant at about 800 MeV for beam energies from SPS to RHIC. It
is shown that the hadron resonance gas model describes the energy dependence,
as well as the lack of centrality dependence, qualitatively. The values of
E_T/N_ch are related to the chemical freeze-out criterium E/N about 1 GeV valid
for primordial hadrons.Comment: 8 pages, 5 figure
Mid-rapidity , , and spectra and particle ratios from STAR
Results are presented on , , and transverse mass
spectra and particle multiplicity ratios at mid-rapidity in Au+Au collisions at
=130 and 200 GeV and in p+p collisions at =200
GeV. Comparisons are made to results from lower energies. The bulk properties
of the collision inferred from these results are discussed.Comment: 4 pages, 3 figures, Talk presented at Quark Matter 2002, Nantes,
France, July 200
Myles Away from Perfect: The Potential Impact on NIL Deals following LSU Quarterback’s Retirement
Just prior to the 2022 College Football Season, Louisiana State University Quarterback Myles Brennan decided to abruptly retire from football. Despite the unexpected finish to his career, Brennan is still going to likely retain all of the money he received in endorsements that were paid through the newly approved “NIL” deals available to collegiate athletes, as a result of a stipulation that these deals cannot be “performance-based”. In this article, Brian Ahle evaluates the potential ways in which endorsers may be able to protect their investments, while still complying with the NIL Policies that provide protections towards the athletes.https://scholarship.law.slu.edu/lawjournalonline/1100/thumbnail.jp
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