An excitation function of K− and K+ production in Au+Au reactions at the AGS

Ahle, L.; Akiba, Y.; Ashktorab, K.; Baker, M. D.; Beavis, D.; Budick, B.; Chang, James; Chasman, C.; Chen, Z.; Chu, Y. Y.; Chujo, T.; Cumming, J. B.; Debbe, R.; Dunlop, J. C.; Eldredge, W.; Fleming, Kathleen; Fung, S. Y.; Garcia, E. Oliver; Gushue, S.; Hamagaki, H.; Hayano, R.; Heintzelman, G.; Kang, Joon Ho; Kim, E. J.; Kumagai, A.; Kurita, K.; Lee, J. H.; Lee, Y. K.; Miake, Y.; Mignerey, A. C.; Moulson, M.; Muentz, C.; Nagano, K.; Ogilvie, C. A.; Olness, J.W.; Oyama, K.; Remsberg, L. P.; Sako, H.; Seto, R.; Shea, J.; Shigaki, K.; Steadman, S. G.; Stephans, G. S. F.; Tamagawa, Toru; Tannenbaum, M. J.; Ueno-Hayashi, S.; Videbæk, F.; Xiang, H.; Wang, F.; Yagi, K.; Zhu, Fan; Back, B. B.; Betts, R. R.; Chang, W. C.; Y., C.; Ganz, R.; Gillitzer, A.; Henning, W.; Hofman, D. J.; Holzman, B.; Kim, S. Y.; Kwon, Y.; McLeod, D.; Nanal, V.; Pak, R.; Ruangma, A.; Russ, D.; Stanskas, P. J.; Wang, H.; Wolfs, F. L. H.; Wuosmaa, A. H.; Xu, G.; Yao, H.; Zou, C.

doi:10.1016/s0370-2693(00)00916-3

Cited by 131 publications

(96 citation statements)

References 38 publications

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“…The right panel of Fig. 2 is a compilation of the evolution of the midrapidity charged particle density, dN ch /dη⌋ |η|≤1 , per participating nucleon pair, N part /2, as a function of collision energy from PHOBOS [44,45,46,47,48,49] and lower energy heavy ion reactions at the SPS [50,51] and AGS [52,53,54,55,56]. The PHOBOS data are for the 6% most central Au+Au interactions.…”

Section: Energy Densitymentioning

confidence: 99%

“…Therefore, this is a system whose description in terms of simple hadronic degrees of freedom is inappropriate. [54,95,96] and PHOBOS at RHIC [91,92]) and Pb+Pb (SPS [93,94]) as a function of nucleon-nucleon center-of-mass energy. Error bars are statistical only.…”

Section: -35%mentioning

confidence: 99%

“…Using particle yields to deduce properties of the system is a concept that long predates QCD and heavy ion collisions [88,89,90]. Figure 4 compares the antiparticle to particle ratios for both protons and kaons measured at RHIC by PHOBOS [91,92] to the corresponding numbers found at lower energies [54,93,94,95,96]. Clearly, the systems formed at RHIC are much closer to having equal numbers of particles and antiparticles than was true at lower energies.…”

Section: Baryon Chemical Potentialmentioning

confidence: 99%

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The PHOBOS perspective on discoveries at RHIC

et al. 2005

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This paper describes the conclusions that can be drawn from the data taken thus far with the PHOBOS detector at RHIC. In the most central Au+Au collisions at the highest beam energy, evidence is found for the formation of a very high energy density system whose description in terms of simple hadronic degrees of freedom is inappropriate. Furthermore, the constituents of this novel system are found to undergo a significant level of interaction. The properties of particle production at RHIC energies are shown to follow a number of simple scaling behaviors, some of which continue trends found at lower energies or in simpler systems. As a function of centrality, the total number of charged particles scales with the number of participating nucleons. When comparing Au+Au at different centralities, the dependence of the yield on the number of participants at higher p T (∼4 GeV/c) is very similar to that at low transverse momentum. The measured values of charged particle pseudorapidity density and elliptic flow were found to be independent of energy over a broad range of pseudorapidities when effectively viewed in the rest frame of one of the colliding nuclei, a property we describe as "extended longitudinal scaling". Finally, the centrality and energy dependences of several observables were found to factorize to a surprising degree.

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Section: Energy Densitymentioning

confidence: 99%

Section: -35%mentioning

confidence: 99%

Section: Baryon Chemical Potentialmentioning

confidence: 99%

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The PHOBOS perspective on discoveries at RHIC

et al. 2005

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“…11 we present excitation functions for a selection of strange particle yields over the whole energy range from lowest AGS to LHC energy. The experimental ratios K ± /π ± , Λ/π + and Ξ − /Λ are calculated from measurements of absolute yields of π ± [29,48,31,32,49,50], K ± [51,31,32,49,50], Λ [52] and Ξ − [53]. The errors reflect the systematic uncertainties.…”

Section: Particle Yields and Their Statistical Descriptionmentioning

confidence: 99%

Ultrarelativistic Nucleus–Nucleus Collisions and the Quark–Gluon Plasma

Andronic¹,

Braun‐Munzinger

2004

The Hispalensis Lectures on Nuclear Physics Vol. 2

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We present an overview of selected aspects of ultrarelativistic nucleus-nucleus collisions, a research program devoted to the study of strongly interacting matter at high energy densities and in particular to the characterization of the quark-gluon plasma (QGP). The basic features of the phase diagram of nuclear matter, as currently understood theoretically, are discussed. The experimental program, carried out over a broad energy domain at various accelerators, is briefly reviewed, with an emphasis on the global characterization of nucleusnucleus collisions. Two particular aspects are treated in more detail: i) the application of statistical models to a phenomenological description of particle production and the information it provides on the phase diagram; ii) the production of hadrons carrying charm quarks as messengers from the QGP phase.

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“…Experimental data on transversal momentum distributions of kaons produced in central Pb+Pb or Au+Au collisions show an anomalous dependence on the collision energy [1,2,3]. The effective temperature T * , or slope parameter of the transversal-momentum spectra [4], increases with energy in AGS and RHIC energy domains.…”

Section: Introductionmentioning

confidence: 99%