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Register a new userMeasurements of $Xi^{-}$ and $overline{Xi}^{+}$ production in proton-proton interactions at $sqrt{s_{NN}}$ = 17.3 GeV in the NA61/SHINE experiment
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The production of $Xi(1321)^{-}$ and $overline{Xi}(1321)^{+}$ hyperons in inelastic p+p interactions is studied in a fixed target experiment at a beam momentum of 158 GeV/textit{c}. Double differential distributions in rapidity y and transverse momentum $p_{T}$ are obtained from a sample of 33M inelastic events. They allow to extrapolate the spectra to full phase space and to determine the mean multiplicity of both $Xi^{-}$ and $overline{Xi}^{+}$. The rapidity and transverse momentum spectra are compared to transport model predictions. The $Xi^{-}$ mean multiplicity in inelastic p+p interactions at 158~GeVc is used to quantify the strangeness enhancement in A+A collisions at the same centre-of-mass energy per nucleon pair.
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Double-differential yields of $Xileft(1530right)^{0}$ and $overline{Xi}left(1530right)^{0}$ 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 $Xileft(1530right)^{0}$ (6.73 $pm$ 0.25 $pm$ 0.67)$times10^{-4}$ and $overline{Xi}left(1530right)^{0}$ (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.
The momentum correlation between protons and lambda particles emitted from central Pb+Pb collisions at sqrt(s_{NN}) = 17.3 GeV was studied by the NA49 experiment at the CERN SPS. A clear enhancement is observed for small relative momenta (q_{inv} < 0.2 GeV). By fitting a theoretical model, which uses the strong interaction between the proton and the lambda in a given pair, to the measured data a value for the effective source size is deduced. Assuming a static Gaussian source distribution we derive an effective radius parameter of R_G = 3.02 pm 0.20$(stat.)^{+0.44}_{-0.16}(syst.) fm.
Pentaquark states have been extensively investigated theoretically in the context of the constituent quark model. In this paper results of an experimental search for pentaquarks in the Ximpim, Ximpip, Xippim and Xippip invariant mass spectra in proton-proton interactions at $sqrt{s}$=17.3~GeV are presented. Previous possible evidence from the NA49 collaboration of the existence of a narrow Ximpim baryon resonance in p+p interactions is not confirmed with almost 10 times greater event statistics. The search was performed using the NASixtyOne detector which reuses the main components of the NA49 apparatus. No signal was observed with either the selection cuts of NA49 or newly optimised cuts.
We report on the first multi-differential measurement of $phi$ meson and $Xi^{-}$ hyperon production as well as the $phi/K^-$ and $phi/Xi^-$ ratio in Au+Au collisions at ${sqrt{s_{rm NN}} = rm{3,GeV}}$ with the STAR experiment under its fixed targ et configuration at RHIC. $phi$ mesons and $Xi^{-}$ hyperons are measured through their hadronic decay channels, $phirightarrow K^+K^-$ and $Xi^-rightarrow Lambdapi^-$. The transverse kinetic energy spectra of $K^-$, $phi$ and $Xi^{-}$ are presented in different centrality and rapidity intervals. The total production yields and the ratios within a $4pi$ coverage are calculated and compared to thermal model predictions. A calculation within the grand canonical ensemble framework shows a clear discrepancy from our measurement. Our data favor the canonical ensemble approach employing local strangeness conservation with a small strangeness correlation length ($r_c leq 4.2$ fm) in 0--10% central Au+Au collisions at ${sqrt{s_{rm NN}} = rm{3,GeV}}$.
Measurements of hadron production in p+C interactions at 31 GeV/c are performed using the NA61/ SHINE spectrometer at the CERN SPS. The analysis is based on the full set of data collected in 2009 using a graphite target with a thickness of 4% of a nuclear interaction length. Inelastic and production cross sections as well as spectra of $pi^pm$, $K^pm$, p, $K^0_S$ and $Lambda$ are measured with high precision. These measurements are essential for improved calculations of the initial neutrino fluxes in the T2K long-baseline neutrino oscillation experiment in Japan. A comparison of the NA61/SHINE measurements with predictions of several hadroproduction models is presented.
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