Charged particle densities from Au+Au collisions at =130 GeV

Bearden, I. G.; Beavis, D.; Beşliu, C.; Blyakhman, Y.; Brzychczyk, J.; Budick, B.; Bøggild, H.; Chasman, C.; Christensen, C. H.; Christiansen, P.; Cibor, J.; Debbe, R.; Gaardhøje, J. J.; Grotowski, K.; Hagel, K.; Hansén, O.; Holm, Anders; Holme, A.K.; Ito, H.; Jakobsen, Emil; Jipa, A.; Jørdre, J. I.; Jundt, F.; Jørgensen, C. E.; Keutgen, T.; Kim, E.J; Kozik, T.; Larsen, T. M.; Lee, J.H; Lee, Y.K; Løvhøiden, G.; Majka, Z.; Makeev, A.; McBreen, E; Murray, M.; Natowitz, J. B.; Nielsen, B. S.; Olchanski, K.; Olness, J.W.; Ouerdane, D.; Płaneta, R.; Rami, F.; Röhrich, D.; Samset, B. H.; Sanders, S.; Sheetz, R. A.; Sosin, Z.; Staszel, P.; Thorsteinsen, T.F.; Tveter, Trine Spedstad; Videbæk, F.; Wada, Ryoichi; Wieloch, A.; Zgura, I. S.

doi:10.1016/s0370-2693(01)01333-8

Cited by 140 publications

(39 citation statements)

References 28 publications

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“…The data at both centralities show an extended scaling with the longitudinal velocity in the rest frame of one of the projectiles, identical behavior to that seen in simpler systems (see, for example, [147,148,142,153]). Similar behavior in nucleus-nucleus collisions over a narrower range in η ′ was first observed by BRAHMS [181,182]. Figure 24 illustrates one example of how the scaling behaviors can be used to infer the properties of particle production which lie outside the experimental acceptance at large collision energies.…”

Section: Longitudinal Dependence Of Particle Production: Au+au At Rhicsupporting

confidence: 65%

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: Longitudinal Dependence Of Particle Production: Au+au At Rhicsupporting

confidence: 65%

The PHOBOS perspective on discoveries at RHIC

et al. 2005

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“…The BRAHMS experiment uses the charged particle multiplicity observed in a pseudorapidity range of −2.2 ≤ η ≤ 2.2 to determine reaction centrality (44,45,46). The multiplicities are measured in a "multiplicity array" consisting of an inner barrel of Si strip detectors (SiMA) and an outer barrel of plastic scintillator "tile" detectors (TMA) (37,47) for collisions within 36 cm of the nominal vertex location.…”

Section: Brahmsmentioning

confidence: 99%

Glauber Modeling in High-Energy Nuclear Collisions

Miller

Reygers

Sanders

et al. 2007

Annu. Rev. Nucl. Part. Sci.

1,531

1,485

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This is a review of the theoretical background, experimental techniques, and phenomenology of what is called the "Glauber Model" in relativistic heavy ion physics. This model is used to calculate "geometric" quantities, which are typically expressed as impact parameter (b), number of participating nucleons (Npart) and number of binary nucleon-nucleon collisions (N coll ). A brief history of the original Glauber model is presented, with emphasis on its development into the purely classical, geometric picture that is used for present-day data analyses. Distinctions are made between the "optical limit" and Monte Carlo approaches, which are often used interchangably but have some essential differences in particular contexts. The methods used by the four RHIC experiments are compared and contrasted, although the end results are reassuringly similar for the various geometric observables. Finally, several important RHIC measurements are highlighted that rely on geometric quantities, estimated from Glauber calculations, to draw insight from experimental observables. The status and future of Glauber modeling in the next generation of heavy ion physics studies is briefly discussed.

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“…Previously it was reported that both charged particle [10,11] and photon pseudorapidity density [12,13], normalized by the average number of participating nucleon pairs as a function of η − y beam , where y beam is the beam rapidity, is independent of beam energy. Further, it was observed that such longitudinal scaling was centrality dependent for charged particles, but was centrality independent for photons [12,13].…”

Section: Longitudinal Scalingmentioning

confidence: 99%

“…Particle production is found to follow a unique, collision energy independent, longitudinal scaling [9] in p+p and d+Au, as well as in heavy-ion collisions [10,11]. Such longitudinal scaling is also found to be independent of collision centrality for photons [12,13].…”

Section: Introductionmentioning

confidence: 99%

Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC

et al. 2010

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We present the multiplicity and pseudorapidity distributions of photons produced in Au+Au and Cu+Cu collisions at √ s NN = 62.4 and 200 GeV. The photons are measured in the region −3.7 < η < −2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of the collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for Au+Au and Cu+Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 ± 0.1 and 1.2 ± 0.1 for √ s NN = 62.4 GeV and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of η − y beam , are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies.

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Charged particle densities from Au+Au collisions at =130 GeV

Abstract: Preprint submitted to Elsevier Science

Cited by 140 publications

References 28 publications

The PHOBOS perspective on discoveries at RHIC

The PHOBOS perspective on discoveries at RHIC

Glauber Modeling in High-Energy Nuclear Collisions

Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC

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