K∗(892)0 meson production in inelastic p+p interactions at 40 and 80 GeV/c beam momenta measured by NA61/SHINE at the CERN SPS

Abstract

Measurements of $K^{\ast }{(892)}^0$ resonance production via its $K^{+}{\pi }^{-}$ decay mode in inelastic p+p collisions at beam momenta 40 and 80 $\text{GeV}/c$ ($\sqrt{s_{\mathit{NN}}}=8.8$ and 12.3 $\text{GeV}$) are presented. The data were recorded by the NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The template method was used to extract the $K^{\ast }{(892)}^0$ signal. Transverse momentum and rapidity spectra were obtained. The mean multiplicities of $K^{\ast }{(892)}^0$ mesons were found to be $(35.1\pm 1.3(\mathrm{stat})\pm 3.6(\mathrm{sys}))·{10}^{-3}$ at 40 $\text{GeV}/c$ and $(58.3\pm 1.9(\mathrm{stat})\pm 4.9(\mathrm{sys}))·{10}^{-3}$ at 80 $\text{GeV}/c$. The NA61/SHINE results are compared with the Epos1.99 and Hadron Resonance Gas models as well as with world data. The transverse mass spectra of $K^{\ast }{(892)}^0$ mesons and other particles previously reported by NA61/SHINE were fitted within the Blast-Wave model. The transverse flow velocities are close to 0.1–0.2 of the speed of light and are significantly smaller than the ones determined in heavy nucleus-nucleus interactions at the same beam momenta.