Centrality dependence of global variables in relativistic heavy ion collisions: Final<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>p</mml:mi><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>data analysis in the framework of a statistical model

Prorok, Dariusz

doi:10.1103/physrevc.73.064901

Cited by 6 publications

(16 citation statements)

References 40 publications

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“…4 in Ref. [7], it looks almost the same as the top plot of Fig. 4 here) the situation in the low-p T range is similar to this in the chemical strangeness non-equilibrium case, namely pions are in complete agreement with the data, kaons are ≈ 13% above and protons and antiprotons are the most overestimated, ≈ 34%.…”

Section: B Identified Hadron Spectrasupporting

confidence: 79%

“…I (for comparison the results for the chemical equilibrium case are repeated from Ref. [7]). Other physical quantities like the surface velocity β max ⊥ , the volume at the beginning of the freeze-out V f.o. )…”

Section: A Determination Of Geometric Parametersmentioning

confidence: 99%

“…This is the case considered in Ref. [7]: the statistical parameters (T = 160.0 MeV, µ B = 24.0 MeV) are fitted to the STAR particle yield ratios [19] and the geometric parameters to the p T spectra of identified hadrons delivered by the STAR Collaboration in Ref. [20].…”

Section: B Identified Hadron Spectramentioning

confidence: 99%

“…Again, since the STAR identified hadron spectra [20] are for different centrality classes than the STAR (K * 0 +K * 0 )/2 spectra [5], the values of geometric parameters for 0 − 10% and 10 − 30% centrality bins explored by STAR in (K * 0 +K * 0 )/2 measurements are the averages of the values fitted in Ref. [7] for bins which added percent coverage equals 0 − 10% and 10 − 30% respectively. This gives ρ max = 8.81 fm, τ = 6.98 fm for the 0 − 10% centrality bin and ρ max = 7.035 fm, τ = 6.095 fm for the 10 − 30% centrality bin.…”

Section: B Identified Hadron Spectramentioning

confidence: 99%

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Statistical hadronization model approach tosNN=200GeV Au-Au collisions:pT<

Prorok

2007

Phys. Rev. C

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Three possible scenarios of the statistical hadronization model are reexamined with the use of the pT spectra of the PHENIX and very low pT PHOBOS measurements at √ sNN = 200 GeV. These scenarios are: (a) full chemical non-equilibrium, (b) strangeness chemical non-equilibrium and (c) chemical equilibrium. Fits to the spectra are done within the Cracow single-freeze-out model, which takes into account both the expansion and resonance decays. Predictions for spectra of φ, K(892) * 0 and π 0 are also given. The global variables like the transverse energy at midrapidity, the charged particle multiplicity at midrapidity and the total multiplicity of charged particles are evaluated and their predicted values agree qualitatively well with the experimental data. The thorough analysis within this model suggests that the chemical full non-equilibrium case is the least likely and both other cases are of the similar likelihood. It is also shown that if the full chemical non-equilibrium freeze-out took place it could manifest itself in the enhancement of the π 0 -production at very low transverse momenta.

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Section: B Identified Hadron Spectrasupporting

confidence: 79%

Section: A Determination Of Geometric Parametersmentioning

confidence: 99%

Section: B Identified Hadron Spectramentioning

confidence: 99%

Section: B Identified Hadron Spectramentioning

confidence: 99%

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Statistical hadronization model approach tosNN=200GeV Au-Au collisions:pT<

Prorok

2007

Phys. Rev. C

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“…This has been achieved with the help of the more general, direct interpretation of the data and the removal of the most weakly bound resonances from the hadron gas. Since the chemical equilibrium SFOM without the above two new assumptions succeeded in the correct description of spectra measured at the RHIC in the broad range of collision energy [5,6,13,22], it might suggest new phenomena occurring in the most central class of Pb-Pb collisions at √ s N N = 2.76 TeV. These phenomena seem to appear at the two levels: in individual events, where the production of identified hadrons in each collision can be describe within the chemical equilibrium SFOM but with the reduced content of the hadron gas, and in the whole sample, causing substantial differences among collisions belonging to the same most central class.…”

Section: Discussionmentioning

confidence: 99%

Single freeze-out, statistics and pion, kaon and proton production in central Pb–Pb collisions at $\sqrt{{s}_{{NN}}}=2.76$ TeV

Prorok¹

2016

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

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Many data in the high energy physics are, in fact, sample means. It is shown that when this exact meaning of the data is taken into account and the most weakly bound states are removed from the hadron resonance gas, the acceptable fit to the whole spectra of pions, kaons and protons measured at midrapidity in central Pb-Pb collisions at √ s N N = 2.76 TeV [Phys.Rev.Lett.109,252301 (2012)] is obtained.The invariant distributions are predicted with the help of the single-freeze-out model in the chemical equilibrium framework. Low p T pions and protons are reproduced simultaneously as well as p/π ratio. Additionally, correct predictions extend over lower parts of large p T data. Some more general, possible implications of this approach are pointed out.

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Rapidity-dependent chemical potentials in a statistical approach

Broniowski¹,

Biedron²

2008

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

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Abstract. We present a single-freeze-out model with thermal and geometric parameters dependent on the position within the fireball and use it to describe the rapidity and transverse-momentum spectra of pions, kaons, protons, and antiprotons measured at RHIC at √ s NN = 200 GeV by BRAHMS. THERMINATOR is used to perform the necessary simulation, which includes all resonance decays. The result of the fit to the data is the expected growth of the baryon and strange chemical potentials with the spatial rapidity α . The value of the baryon chemical potential at α ∼ 3 is about 200 MeV, i.e. lies in the range of the highest SPS energies. The chosen geometry of the fireball has a decreasing transverse size as the magnitude of α is increased, which also corresponds to decreasing transverse flow. The strange chemical potential obtained from the fit to the K + /K − ratio is such that the local strangeness density in the fireball is compatible with zero. The resulting rapidity spectra of net protons are described qualitatively within the statistical approach. As a result of our study, the knowledge of the "topography" of the fireball is acquired, allowing for other analyses and predictions.

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Centrality dependence of global variables in relativistic heavy ion collisions: FinalpTdata analysis in the framework of a statistical model

Cited by 6 publications

References 40 publications

Statistical hadronization model approach tosNN=200GeV Au-Au collisions:pT<

Statistical hadronization model approach tosNN=200GeV Au-Au collisions:pT<

Single freeze-out, statistics and pion, kaon and proton production in central Pb–Pb collisions at $\sqrt{{s}_{{NN}}}=2.76$ TeV

Rapidity-dependent chemical potentials in a statistical approach

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