We present Lambda Lambda correlation measurements in heavy-ion collisions for Au + Au collisions at root s(NN) = 200 GeV using the STAR experiment at the Relativistic Heavy-Ion Collider. The Lednicky-Lyuboshitz analytical model has been used to fit the data to obtain a source size, a scattering length and an effective range. Implications of the measurement of the Lambda Lambda correlation function and interaction parameters for dihyperon searches are discussed.

/pdf/l-l-correlation-function-in-au-au-collisions-at-snn-200gev-3o3l3nhxyr.pdf

Λ Λ correlation function in Au+Au collisions at sNN =200GeV

A high statistics measurement of the $\mathrm{\ensuremath{\Lambda}}\phantom{\rule{0}{0ex}}\mathrm{\ensuremath{\Lambda}}$ correlation function in heavy-ion collisions at RHIC suggests that the strength of the interaction is weak and provides a new limit on H-dibaryon production

/pdf/llcorrelation-function-inau-aucollisions-atsnn-200-gev-ubb0q2tug5.pdf

ΛΛCorrelation Function inAu+AuCollisions atsNN=200 GeV

We extend the study of a ${J}^{P}={2}^{+},I=3/2$, $\ensuremath{\pi}\ensuremath{\Lambda}N$ quasibound state [Phys. Rev. D 78, 014013 (2008)] by solving nonrelativistic Faddeev equations, using ${}^{3}{S}_{1}\ensuremath{-}{}^{3}{D}_{1}$, $\ensuremath{\Lambda}N\ensuremath{-}\ensuremath{\Sigma}N$ coupled channels chiral quark model local interactions, and $\ensuremath{\pi}N$ and coupled $\ensuremath{\pi}\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\pi}\ensuremath{\Sigma}$ separable interactions fitted to the position and decay parameters of the $\ensuremath{\Delta}(1232)$ and $\ensuremath{\Sigma}(1385)$ resonances, respectively. The results exhibit a strong sensitivity to the $p$-wave pion-hyperon interaction, with a $\ensuremath{\pi}\ensuremath{\Lambda}N$ quasibound state persisting over a wide range of acceptable parametrizations.

Coupled channels calculation of a π Λ N quasibound state

Exotic strange multibaryon states have been observed in the effective mass spectra of: Λπ±, Λπ+π−, Λp, Λpp, Λπp, ΛΛ and ΛKs0, Ks0p, Ks0π± subsystems. The measured Λ/π+ ratio for average multiplicities from the pC reaction is equal to (5.3 ± 0.8) × 10−2, and it is approximately two times larger than the Λ/π+ ratio simulated by the FRITIOF model and than that of experimental pp reactions at the same energy. The observed wellknown resonances Σ*+ (1385) and K*± (892) from PDG are good tests of this method. The mean value of the mass for the Σ*−(1385) resonance is shifted to 1370 MeV/c2 and the width is two times larger than the same value from PDG. Such kind of behavior for the width and invariant mass of Σ*− (1385) resonance is interpreted as an extensive contribution from stopped Ξ− → Λπ− and medium effect. There is enhancement of the production contribution for all observed hyperons. A few events were registered by hypothesis of light H0 and heavy H0, + dihyperons. Dihyperons were observed by weak decay channels: (Σ−p), (Λpπ−), (Λpπ0), and (K−pp).

The search for and study of the strange multibaryon states in systems with Λ-hyperon and K s 0 -meson in pA collision at momentum of 10 GeV/ c

Study of ΛΛ correlations and search for H-dibaryon with STAR detector at RHIC

Strange particle production and an H-dibaryon search in p-A collisions at the AGS

Experiment 910 at the Brookhaven National Laboratory AGS accelerator is a study of proton-nucleus collisions using 6, 12.5 and 18 GeV/c proton beams. E910 was designed to have close to 100% acceptance, and to provide a large enough data sample to allow particle production to be studied as a function of collision “centrality”. The E910 spectrometer is built around a large TPC, as shown schematically in fig. 1. Because the TPC does not provide good particle identification or momentum resolution at high momentum, these are obtained by including downstream tracking, a time of flight detector and a Cherenkov detector.

H Dibaryon Search in p-A Collisions at the AGS

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Strange particle production and an H-dibaryon search in p-A collisions at the AGS

H Dibaryon Search in p-A Collisions at the AGS