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Scaling properties at freeze-out in relativistic heavy ion collisions

The collaboration
Phys.Rev.C 83 (2011) 034910, 2011.

Abstract
Identified charged pion, kaon, and proton spectra are used to explore the system size dependence of bulk freeze-out properties in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 and 62.4 GeV. The data are studied with hydrodynamically-motivated Blast-wave and statistical model frameworks in order to characterize the freeze-out properties of the system. The dependence of freeze-out parameters on beam energy and collision centrality is discussed. Using the existing results from Au+Au and $pp$ collisions, the dependence of freeze-out parameters on the system size is also explored. This multi-dimensional systematic study furthers our understanding of the QCD phase diagram revealing the importance of the initial geometrical overlap of the colliding ions. The analysis of Cu+Cu collisions, which expands the system size dependence studies from Au+Au data with detailed measurements in the smaller system, shows that the bulk freeze-out properties of charged particles studied here scale with the total charged particle multiplicity at mid-rapidity, suggesting the relevance of initial state effects.

• #### Figure 3(a)

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Negatively charged pion spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 3(b)

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Negatively charged pion spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 3(c)

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Negatively charged kaon spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 3(d)

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Negatively charged kaon spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 3(e)

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Negatively charged proton spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 3(f)

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Negatively charged proton spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 4(a)

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Positively charged pion spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 4(b)

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Positively charged pion spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 4(c)

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Positively charged kaon spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 4(d)

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Positively charged kaon spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 4(e)

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Positively charged proton spectra from Cu+Cu collisions 200 GeV as a function of pT for different centralities.

• #### Figure 4(f)

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Positively charged proton spectra from Cu+Cu collisions 62.4 GeV as a function of pT for different centralities.

• #### Figure 6(a)

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Mean transverse momentum of negatively charged pions, kaons and protons as a function of charged hadron multiplicity.

• #### Figure 6(b)

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Mean transverse momentum of positively charged pions, kaons and protons as a function of charged hadron multiplicity [figure not available...

• #### Figure 7(a)

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Integrated yields of negatively charged pions, kaons and protons as a function of charged hadron multiplicity.

• #### Figure 7(b)

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Integrated yields of positively charged pions, kaons and protons as a function of charged hadron multiplicity [figure not available in...

• #### Figure 8(a)

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particle Ratios -I (pbar/pi^-, k^-/pi^-) versus multiplicity.

• #### Figure 8(b)

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particle ratios -II (p/pi^+, k^+/pi^+) versus multiplicity.

• #### Figure 8(c)

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particle ratios -III (p+pbar/pi, k/pi) versus multiplicity.

• #### Figure 8(d)

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particle Ratios -IV (pi^-/pi^+, k^-/k^+, pbar/p) versus multiplicity [only pbar/p figure available in paper].

• #### Figure 9

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Enhancement factors for negatively charged pions, kaons and protons as a function of Npart [Ref. Phys.Rev.C 81, 044902, 2010]. pp...

• #### Figure 10(b)

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The kinetic freeze-out temperature (Tkin) and chemical freeze-out temperature (Tch) versus multiplicity.

• #### Figure 10(c)

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flow velocity versus multiplicity.

• #### Figure 13

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chemical potentials versus multiplicity.

• #### Figure 14(b)

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strangeness suppression factor versus multiplicity.

• #### Appendix -I

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dNch/deta values for different centrality.

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