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Measurements of Xileft(1530right)⁰ and overline{Xi}left(1530right)⁰ production in proton-proton interactions at sqrt{s_(NN)} = 17.3 GeV in the NA61/SHINE experiment
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Measurements of Xileft(1530right)⁰ and overline{Xi}left(1530right)⁰ production in proton-proton interactions at sqrt{s_(NN)} = 17.3 GeV in the NA61/SHINE experiment
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Double-differential yields of $\Xi\left(1530\right)^{0}$ and $\overline{\Xi}\left(1530\right)^{0}$ resonances produced in \pp interactions were measured at a laboratory beam momentum of 158~\GeVc. This measurement is the first of its kind in \pp interactions below LHC energies. It was performed at the CERN SPS by the \NASixtyOne collaboration. Double-differential distributions in rapidity and transverse momentum were obtained from a sample of 26$\cdot$10$^6$ inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of $\Xi\left(1530\right)^{0}$ (6.73 $\pm$ 0.25 $\pm$ 0.67)$\times10^{-4}$ and $\overline{\Xi}\left(1530\right)^{0}$ (2.71 $\pm$ 0.18 $\pm$ 0.18)$\times10^{-4}$. The rapidity and transverse momentum spectra and mean multiplicities were compared to predictions of string-hadronic and statistical model calculations.
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$K^{*}(892)^0$ production and the time between freeze-outs in $^{40}$Ar+$^{45}$Sc collisions by NA61/SHINE at the CERN SPS
First K*(892)^0 yields in central 40Ar+45Sc at √sNN=8.8–16.8 GeV give freeze-out time intervals of a few fm/c (lower limits) at the higher energies, similar to Pb+Pb.
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