Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{_{NN}}} =$~6.3 to 17.3 GeV

Energy dependence of kaon-to-proton ratio fluctuations in centralPb+Pbcollisions fromsNN=6Antičić1, Baatar2, Barna3 et al. 2011Phys. Rev. C231160View full textAdd to dashboardCite

“…1. The azimuthal acceptance is described in [17] and the comprehensive acceptance tables to be used in simulations can be found in [18]. At each energy, the largest possible acceptance was used to ensure the highest statistical significance.…”

“…The analysis procedure is similar to the one employed by NA49 in the study of fluctuations of the K/π and p/π ratios [17]. in [19,20] is used.…”

“…This sample is made such as to preserve the original multiplicity distribution, with no two tracks in a mixed event taken from the same physical event. As described in detail in [17], the mixed events contain no correlation due to physical processes, but effects from finite number statistics remain. The measured dE/dx information is still attached to the individual particles, so that the likelihood method can be applied to the mixed events in the same way as to the original events.…”

“…Their scaled dispersion is denoted σ mix . The dynamical fluctuations can now be constructed as the quadratic difference [17,19,20]:…”

“…The method described above has been successfully used and thoroughly tested in the analysis of K/π and p/π fluctuations [17], and the same extensive quality checks were applied in the present analysis. For instance, outlying events with very small or high K/p ratios were found to contribute only modestly to the reported fluctuation signal: Consistent with [17],…”