May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

Study of $\Lambda-\Lambda$ correlations and search for the H-dibaryon with the STAR detector at RHIC

Not scheduled
Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 94
Poster Correlations and fluctuations


Neha Shah (UCLA)


Considerable experimental efforts have been devoted to search for the existence of H-dibaryon, a six quark state, proposed by Jaffe[1]. It has also been proposed that the H particle would appear as a bump in the $\Lambda-\Lambda$ invariant mass spectra if the H is a resonance state, or the H would lead to a depletion of the Lambda-\Lambda$ correlation near the threshold if the H is weakly bound. In this scenario, the mass of H is expected to be in the range (2230, 2380) MeV. Because of high rate of strange particle production per heavy ion collision, Relativistic Heavy Ion Collider (RHIC) is a unique place to search for the H-dibaryon. The $\Lambda-\Lambda$ correlation measurements at RHIC are sensitive to their mutual interactions, which can be used to probe whether there is a stable H particle or H resonance. This sensitivity is unique at RHIC because of the allowed range of $\Lambda-\Lambda$ scattering parameters in nucleus-nucleus collisions. We will present the measurement of $\Lambda-\Lambda$ correlations in Au+Au collisions at $\sqrt{s}=39$GeV and $\sqrt{s}=200$GeV using the STAR experiment at RHIC. [1] R. L. Jaffe, Phys. Rev. Lett. 38, 195 (1977).

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