Effects of nucleus initialization on event-by-event observables

Tavares, B. Mattos; Drescher, H. J.; Kodama, T.

doi:10.1590/s0103-97332007000100014

Cited by 14 publications

(15 citation statements)

References 8 publications

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“…(As mentioned in ref. [1], this choice also gave reasonably good agreement with the results forṽ rms 2 in the literature for (almost) central events [4].) Although overall shape of the plot ofṽ rms n will crucially depend on the values of these proportionality constants, and hence may change completely from what is shown here, the qualitative features such as the presence of peaks may remain unaffected.…”

Section: Results For Non-central Collisionssupporting

confidence: 84%

“…The average value is determined by carrying out the Fourier expansion in the event-plane reference frame. Even for the so-called 'central collisions' one determines event plane for very small impact parameter collisions and then carries out the traditional analysis of determination of average flow [4]. However, determination of event plane is highly non-trivial making determination of higher flow coefficients very difficult.…”

Section: Using Cmbr Analysis Tools For Rhicementioning

confidence: 99%

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Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

et al. 2010

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Recently we have shown that there are crucial similarities in the physics of cosmic microwave background radiation (CMBR) anisotropies and the flow anisotropies in relativistic heavy-ion collision experiments (RHICE). We also argued that, following CMBR anisotropy analysis, a plot of root-mean square values of the flow coefficients, calculated in a lab fixed frame for RHICE, can yield important information about the nature of initial state anisotropies and their evolution. Here we demonstrate the strength of this technique by showing that elliptic flow for non-central collisions can be directly determined from such a plot without any need for the determination of event-plane.

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Section: Results For Non-central Collisionssupporting

confidence: 84%

Section: Using Cmbr Analysis Tools For Rhicementioning

confidence: 99%

Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

et al. 2010

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“…1), additional deviations can be attributed to different initializations of the nuclei in both models. Indeed, the event-by-event observables show a higher sensitivity to the initial nucleon density distribution than the standard single particle observables [25]. A pilot study using UrQMD shows different ω when applying different initialization shapes.…”

Section: Multiplicity Fluctuations In 1% Most Central Collisionsmentioning

confidence: 97%

Multiplicity fluctuations in nucleus-nucleus collisions: Dependence on energy and atomic mass number

et al. 2008

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Event-by-event multiplicity fluctuations in central C+C, S+S, In+In, and Pb+Pb as well as p+p collisions at bombarding energies from 10 to 160 AGeV are studied within the hadron string dynamics and ultrarelativistic quantum molecular dynamics microscopic transport approaches. Our investigation is directly related to the future experimental program of the NA61 Collaboration at the SPS for a search of the quantum chromodynamics (QCD) critical point. The dependence on energy and atomic mass number of the scaled variances for negative, positive, and all charged hadrons is presented and compared to the results of the model of independent sources. Furthermore, the nucleus-nucleus results from the transport calculations are compared to inelastic proton-proton collisions for reference. We find a dominant role of the participant number fluctuations in nucleus-nucleus reactions at finite impact parameter b. To reduce the influence of the participant numbers fluctuations on the charged particle multiplicity fluctuations only the most central events have to be selected. Accordingly, the samples of the 1% most central nucleus-nucleus collisions with the largest numbers of the projectile participants are studied. The results are compared with those for collisions at zero impact parameter. A strong influence of the centrality selection criteria on the multiplicity fluctuations is pointed out. Our findings are essential for an optimal choice of colliding nuclei and bombarding energies for the experimental search of the QCD critical point.

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“…To mimic experimental conditions as realistically as possible the non-equilibrium dynamics in the initial and the final state are taken into account on an event-by-event basis (see e.g. discussions in [24,16,17,25,26,27]).…”

Section: Model Descriptionmentioning

confidence: 99%

The ⟨m_T⟩ excitation function: freeze-out and equation of state dependence

Petersen

Steinheimer

Bleicher

et al. 2009

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

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An integrated Boltzmann+hydrodynamics transport approach is applied to investigate the dependence of the mean transverse mass on the freeze-out and the equation of state over the energy range from E lab = 2 − 160A GeV. This transport approach based on the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) with an intermediate hydrodynamic stage allows for a systematic comparison without adjusting parameters. We find that the multiplicities of pions and protons are rather insensitive to different freeze-out prescriptions and changes in the equation of state, but the yields are slightly reduced in the hybrid model calculation compared to a pure transport calculation while the (anti)kaon multiplicities are increased. The mean transverse mass excitation functions of all three particle species are found to be sensitive to the different freeze-out treatments as well as to the equation of state. We find that the bag model equation of state with a strong first order phase transition is in qualitative agreement with the experimentally observed step-like behaviour in the m T excitation function. The hybrid model with a hadron gas equation of state leads to a overestimation of the m T , especially at higher energies. However, nonequilibrium effects seem also to be substantial as is suggested by the comparison with standard UrQMD results.PACS numbers: 25.75.Nq,24.10.Lx,24.10.Nz m T excitation function

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Effects of nucleus initialization on event-by-event observables

Cited by 14 publications

References 8 publications

Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

Multiplicity fluctuations in nucleus-nucleus collisions: Dependence on energy and atomic mass number

The ⟨m_T⟩ excitation function: freeze-out and equation of state dependence

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Effects of nucleus initialization on event-by-event observables

Cited by 14 publications

References 8 publications

Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

Using cosmic microwave background radiation analysis tools for flow anisotropies in relativistic heavy-ion collisions

Multiplicity fluctuations in nucleus-nucleus collisions: Dependence on energy and atomic mass number

The ⟨mT⟩ excitation function: freeze-out and equation of state dependence

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The ⟨m_T⟩ excitation function: freeze-out and equation of state dependence