Darwin’s God: Evolution and the Problem of Evil

Anderson, Owen

doi:10.5840/pc20035275

Cited by 8 publications

(7 citation statements)

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“…The vast range of data collected in the BES program allows for the systematic study of kinetic freeze-out parameters and to see their energy dependence trends. The BES results presented here are obtained for Au+Au collisions at √ s NN = 7.7, 11.5, 19.6, 27, and 39 GeV at mid-rapidity (|y| <0.1) using both STAR Time Projection Chamber (TPC) and Time Of Flight (TOF) detectors [17]. The error bars shown in figures represent the statistical and systematic errors added in quadrature.…”

Section: Introductionmentioning

confidence: 99%

Systematics of kinetic freeze-out properties in high energy collisions from STAR

Kumar

2014

Nuclear Physics A

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The main aim of the RHIC Beam Energy Scan (BES) program is to explore the QCD phase diagram which includes search for a possible QCD critical point and the phase boundary between QGP and hadronic phase. We report the collision energy and centrality dependence of kinetic freeze-out properties from the measured mid-rapidity (|y| < 0.1) light hadrons (pions, kaons, protons and their anti-particles) for Au+Au collisions at the center-of-mass energy √ s NN = 7.7, 11.5, 19.6, 27, and 39 GeV. The STAR detector, with a large uniform acceptance and excellent particle identification is used in the data collection and analysis. The kinetic freeze-out temperature T kin and average collective velocity β parameters are extracted from blast-wave fits to the identified hadron spectra and systematically compared with the results from other collision energies including those at AGS, SPS and LHC. It is found that all results fall into an anti-correlation band in the 2-dimension (T kin , β ) distribution: the largest value of collective velocity and lowest temperature is reached in the most central collisions at the highest collision energy. The energy dependence of these freeze-out parameters are discussed.

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Section: Introductionmentioning

confidence: 99%

Systematics of kinetic freeze-out properties in high energy collisions from STAR

Kumar

2014

Nuclear Physics A

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“…Once the (T, µ B ) space points are obtained, one can study various signatures of the possible QCD phase boundary and QCD critical point. The data presented here are from Au+Au collisions at √ s N N = 7.7, 11.5, and 39 GeV, for the midrapidity (|y| < 0.1) region using both the STAR Time Projection Chamber (TPC) and the Time Of Flight (TOF) detectors [3]. The errors shown in figures are statistical and systematic errors added in quadrature.…”

Section: Introductionmentioning

confidence: 99%

Identified hadron production from the RHIC beam energy scan

Kumar

2011

J. Phys. G: Nucl. Part. Phys.

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A current focus at RHIC is the Beam Energy Scan to study the QCD phase diagram -temperature (T ) vs. baryon chemical potential (µ B ). The STAR experiment has collected data for Au+Au collisions at √ s N N = 7.7 GeV, 11.5 GeV, and 39 GeV in the year 2010. We present midrapidity results on rapidity density, average transverse mass, and particle ratios for identified hadrons from the STAR experiment. Collision dynamics are studied in the framework of chemical and kinetic freeze-out conditions.

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“…The new data presented are from approximately 20 million Au+Au √ s N N = 200 GeV and 40 million Cu+Cu √ s N N = 200 GeV collisions recorded at RHIC in 2004 and 2005, respectively. In order to extract the Λ,Λ, K 0 S , Ξ − ,Ξ + , Ω − ,Ω + yields as a function of transverse momentum, p T , STAR's [7] Time Projection Chamber (TPC) [8] is utilized to identify these particles via their dominant weak decay channels. The channels are…”

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confidence: 99%

Strangeness Enhancement in Cu-Cu and Au-Au Collisions atsNN=200 GeV

Agakishiev¹,

Aggarwal²,

Ahammed³

et al. 2012

Phys. Rev. Lett.

135

103

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We report new STAR measurements of mid-rapidity yields for the Λ, Λ, K 0 S , Ξ − , Ξ+ , Ω − , Ω+ particles in Cu+Cu collisions at √ sNN = 200 GeV, and mid-rapidity yields for the Λ, Λ, K 0 Sparticles in Au+Au at √ sNN = 200 GeV. We show that at a given number of participating nucleons, the production of strange hadrons is higher in Cu+Cu collisions than in Au+Au collisions at the same center-of-mass energy. We find that aspects of the enhancement factors for all particles can be described by a parameterization based on the fraction of participants that undergo multiple collisions.

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Darwin’s God: Evolution and the Problem of Evil

Cited by 8 publications

References 0 publications

Systematics of kinetic freeze-out properties in high energy collisions from STAR

Systematics of kinetic freeze-out properties in high energy collisions from STAR

Identified hadron production from the RHIC beam energy scan

Strangeness Enhancement in Cu-Cu and Au-Au Collisions atsNN=200 GeV

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