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K/pi Fluctuations at Relativistic Energies

The collaboration
Phys.Rev.Lett. 103 (2009) 092301, 2009.

Abstract (data abstract)
We report results for $K/\pi$ fluctuations from Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6, 62.4, 130, and 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. Our results for $K/\pi$ fluctuations in central collisions show little dependence on the incident energies studied and are on the same order as results observed by NA49 at the Super Proton Synchrotron in central Pb+Pb collisions at $\sqrt{s_{NN}}$ = 12.3 and 17.3 GeV. We also report results for the collision centrality dependence of K/π fluctuations as well as results for $K^{+}/\pi^{+}$, $K^{-}/\pi^{-}$, $K^{+}/\pi^{-}$, and $K^{-}/\pi^{+}$ fluctuations. We observe that the $K/\pi$ fluctuations scale with the multiplicity density, $dN/d\eta$, rather than the number of participating nucleons.

• #### Figure 1

Data from Figure 1

10.17182/hepdata.98971.v1/t1

(Color online) The event-by-event $K/\pi$ ratio for 200 GeV Au+Au central collisions (0-5%) compared with the same quantity calculated from...

• #### Figure 1 inset

Data from Figure 1 inset

10.17182/hepdata.98971.v1/t2

(Color online) The event-by-event $K/\pi$ ratio for 200 GeV Au+Au central collisions (0-5%) compared with the same quantity calculated from...

• #### Figure 2

Data from Figure 2

10.17182/hepdata.98971.v1/t3

(Color online) Measured dynamical $K/\pi$ fluctuations in terms of σdyn for central collisions (0 - 5%) of 19.6, 62.4, 130,...

• #### Figure 3

Data from Figure 3

10.17182/hepdata.98971.v1/t4

(Color online) Measured dynamical $K/\pi$ fluctuations in terms of $\nu_{dyn,K\pi}$ for 62.4 and 200 GeV Au+Au compared with $\sigma^{2}_{dyn}$ from...

• #### Figure 4

Data from Figure 4

10.17182/hepdata.98971.v1/t5

(Color online) The dN/dη scaled dynamical $K/\pi$ fluctuations for summed charges (stars), same signs (circles), and opposite signs (squares) as...