'P, therefore, P' without Circularity

Sorensen, Roy

doi:10.5840/jphil199188558

Cited by 27 publications

(22 citation statements)

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“…The data at RHIC is consistent with a partially thermalized system of deconfined quarks undergoing collective expansion with an azimuthal anisotropy in momentum space proportional to the initial spatial anisotropy [3,14,15]. As the system cools, pairs and triplets of neighboring quarks coalesce to become the valence quarks (or "constituent quarks") of mesons and baryons (where the gluons presumably contribute to dressing the valence quarks [16,17]).…”

Section: Introduction a Quark Coalescence In The Highest-energy Hmentioning

confidence: 72%

“…Thus, coalescence provides a natural explanation for the "anomolous baryon enhancement" at intermediate p T observed in the highest-energy heavy ion collisions at RHIC [2]. Similarly, the nuclear modification factor-the scaled ratio R AA (p T ) of transverse momentum distributions from heavy ion and p + p collisions-shows a clear separation into mesons and baryons [3,15].…”

Section: Introduction a Quark Coalescence In The Highest-energy Hmentioning

confidence: 99%

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Constituent quark scaling violation due to baryon number transport

2011

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In ultra-relativistic heavy ion collisions at √ s NN ≈ 200 GeV, the azimuthal emission anisotropy of hadrons with low and intermediate transverse momentum (p T 4 GeV/c) displays an intriguing scaling. In particular, the baryon (meson) emission patterns are consistent with a scenario in which a bulk medium of flowing quarks coalesces into three-quark (two-quark) "bags." While a full understanding of this number of constituent quark (NCQ) scaling remains elusive, it is suggestive of a thermalized bulk system characterized by colored dynamical degrees of freedom-a quark-gluon plasma (QGP). In this scenario, one expects the scaling to break down as the central energy density is reduced below the QGP formation threshold; for this reason, NCQ-scaling violation searches are of interest in the energy scan program at the Relativistic Heavy Ion Collider (RHIC). However, as √ s NN is reduced, it is not only the initial energy density that changes; there is also an increase in the net baryon number at midrapidity, as stopping transports entrance-channel partons to midrapidity. This phenomenon can result in violations of simple NCQ scaling. Still in the context of the quark coalescence model, we describe a specific pattern for the break-down of the scaling that includes different flow strengths for particles and their anti-partners. Related complications in the search for recently suggested exotic phenomena are also discussed.

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Section: Introduction a Quark Coalescence In The Highest-energy Hmentioning

confidence: 72%

Section: Introduction a Quark Coalescence In The Highest-energy Hmentioning

confidence: 99%

Constituent quark scaling violation due to baryon number transport

2011

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“…Recently in references (53) and (76), the STAR and PHOBOS collaborations have reported measurements of not only the v 2 , but also the r.m.s. width σ v 2 .…”

Section: Eccentricity Fluctuationsmentioning

confidence: 99%

Glauber Modeling in High-Energy Nuclear Collisions

Miller

Reygers

Sanders

et al. 2007

Annu. Rev. Nucl. Part. Sci.

1,535

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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“…Despite the short lifetime of this matter (on the order of 10 fm/c), there is strong evidence that it has time to (locally) thermalize and can be described as a nearly perfect fluid. One can compute the expected abundance of different particle species produced from a thermalized QGP and compare it with the ratios of detected particle species at RHIC or LHC; the results are in good agreement with one another [1], [2]. Another place where hydrodynamics has provided particularly good agreement with heavy ion experiments is with the so-called "collective flow" [1] [3].…”

Section: Experiments At the Relativistic Heavy Ion Collider (Rhic) Anmentioning

confidence: 52%

“…One can compute the expected abundance of different particle species produced from a thermalized QGP and compare it with the ratios of detected particle species at RHIC or LHC; the results are in good agreement with one another [1], [2]. Another place where hydrodynamics has provided particularly good agreement with heavy ion experiments is with the so-called "collective flow" [1] [3]. When two nuclei collide the resulting QGP will be anisotropic in space, because of differences in density distributions inside the individual nuclei, even for central collisions.…”

Section: Experiments At the Relativistic Heavy Ion Collider (Rhic) Anmentioning

confidence: 63%

Precision studies ofvnfluctuations

Gorda¹,

Romatschke²

2014

Phys. Rev. C

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The power spectrum of heavy ion collisions is investigated by studying initial state fluctuations on top of a smooth hydrodynamic flow. In particular, the stability of the location of the first minimum of the power spectrum and the dependence of the hydrodynamic response v n /ε n on n and on η/s are discussed. In our study we develop a new Green's function method for the analytic hydrodynamic flow by S. Gubser and make use of a fully non-linear hydrodynamics code. We find that there will be no well-defined first minimum of the response for n < 10, due to the fact that all minima in that region are found to be sensitive to the location of the initial perturbations. Also, we find that the often proposed form of the hydrodynamical response, that ln (v n /ε n ) depend quadratically on n and linearly on η/s, should not hold once many events have been averaged over.

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'P, therefore, P' without Circularity

Cited by 27 publications

References 0 publications

Constituent quark scaling violation due to baryon number transport

Constituent quark scaling violation due to baryon number transport

Glauber Modeling in High-Energy Nuclear Collisions

Precision studies ofvnfluctuations

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