Neutral kaon interferometry in Au+Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.C 74 (2006) 054902, 2006.

Abstract (data abstract)
We present the first statistically meaningful results from two-K0s interferometry in heavy-ion collisions. A model that takes the effect of the strong interaction into account has been used to fit the measured correlation function. The effects of single and coupled channel were explored. At the mean transverse mass m_T = 1.07 GeV, we obtain the values R = 4.09 +/- 0.46 (stat.) +/- 0.31 (sys) fm and lambda = 0.92 +/- 0.23 (stat) +/- 0.13 (sys), where R and lambda are the invariant radius and chaoticity parameters respectively. The results are qualitatively consistent with m_T systematics established with pions in a scenario characterized by a strong collective flow.

  • Figure 1

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    K0s invariant mass distribution

  • Figure 2

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    Signal to (Signal + Background) ratio for K0s decay length > 6 cm.

  • Figure 3

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    Mean KT distribution of K0s pairs

  • Figure 4

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    K0sK0s correlation function

  • Figure 5

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    K0sK0s theoretical correlation function

  • Figure 6

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    K0sK0s correlation function with fit functions

  • Figure 7

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    K0sK0s radius versus pair purity

  • Figure 8

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    K0sK0s lambda versus pair purity

  • Figure 9

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    K0sK0s radius versus Mean KT

  • Figure 10

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    K0sK0s radius versus MT

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