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Strangeness Enhancement in Cu+Cu and Au+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV

The collaboration
Phys.Rev.Lett. 108 (2012) 072301, 2012.

Abstract (data abstract)
BNL-RHIC. We report new STAR measurements of mid-rapidity yields for the $\Lambda$, $\bar{\Lambda}$, $K^0_S$, $\Xi^-$, $\bar{\Xi}^+$, $\Omega^-$, $\bar{\Omega}^+$ particles in Cu+Cu collisions at $\sqrt{s_{NN}} = 200$ GeV, and mid-rapidity yields for the $\Lambda$, $\bar{\Lambda}$, $K^0_S$ particles in Au+Au at $\sqrt{s_{NN}} = 200$ GeV. We show that at a given number of participating nucleons, the production of strange hadrons is higher in Cu+Cu collisions than in Au+Au collisions at the same center-of-mass energy. We find that aspects of the enhancement factors for all particles can be described by a parameterization based on the fraction of participants that undergo multiple collisions.

• #### Figure 1.1: Invariant mass spectra vs $p_T$

Data from Figure 1

10.17182/hepdata.95886.v1/t1

$K^0_S$ invariant mass spectra from Cu+Cu $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The uncertainties on the spectra...

• #### Figure 1.2: Invariant mass spectra vs $p_T$

Data from Figure 1

10.17182/hepdata.95886.v1/t2

$\Lambda$ and $\bar{\Lambda}$ invariant mass spectra from Cu+Cu $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The $\Lambda$ and...

• #### Figure 1.3: Invariant mass spectra vs $p_T$

Data from Figure 1

10.17182/hepdata.95886.v1/t3

$\Xi$ and $\bar{\Xi}$ invariant mass spectra from Cu+Cu $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The uncertainties on...

• #### Figure 1.4: Invariant mass spectra vs $p_T$

Data from Figure 1

10.17182/hepdata.95886.v1/t4

$\Omega + \bar{\Omega}$ invariant mass spectra from Cu+Cu $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The uncertainties on...

• #### Figure 1.5: Invariant yield vs $p_T$ in Au+Au (0-12%) collisions

Data from Figure 1

10.17182/hepdata.95886.v1/t5

$K^0_S$ invariant mass spectra from Au+Au $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The uncertainties on the spectra...

• #### Figure 1.6: Invariant yield vs $p_T$ in Au+Au (0-12%) collisions

Data from Figure 1

10.17182/hepdata.95886.v1/t6

$\Lambda$ and $\bar{\Lambda}$ invariant mass spectra from Au+Au $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The $\Lambda$ and...

• #### Figure 2.1: $d^2N/dydp_T$ mass spectra as a function of $p_T$

Data from Figure 2

10.17182/hepdata.95886.v1/t7

$K^0_S$, $\Lambda$, and $\bar{\Lambda}$, spectra divided by $\langle N_{part} \rangle$ for Cu+Cu $0 − 10\%$ ($\langle N_{part} \rangle \sim 99$)...

• #### Figure 2.2: $d^2N/dydp_T$ mass spectra as a function of $p_T$

Data from Figure 2

10.17182/hepdata.95886.v1/t8

• #### Figure 2.4: $d^2N/dydp_T$ mass spectra as a function of $p_T$

Data from Figure 2

10.17182/hepdata.95886.v1/t10

• #### Figure3.1: Strangeness Enhancement as a function of Npart

Data from Figure 3

10.17182/hepdata.95886.v1/t12

The enhancement factor for (multi-) strange particles in Cu+Cu $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The $\Lambda$,...

• #### Figure3.2: Strangeness Enhancement as a function of Npart

Data from Figure 3

10.17182/hepdata.95886.v1/t13

The enhancement factor for (multi-) strange particles in Au+Au $\sqrt{s_{NN}} = 200$ GeV collisions, where $|y| < 0.5$. The $\Lambda$,...

• #### Figure4: Ratio of particle yields

Data from Figure 4

10.17182/hepdata.95886.v1/t14

Ratio of particle yields in central Cu+Cu and midcentral Au+Au collisions when $\langle N_{part} \rangle = 99$ in each case...