Exotic particle searches with STAR at RHIC
Sonia Kabana (for the STAR Collaboration)

TL;DR
This paper reports preliminary results from the STAR experiment at RHIC, observing a narrow peak in invariant mass spectra that could indicate a new exotic pentaquark particle in heavy-ion collisions.
Contribution
First search for exotic pentaquark states in Au+Au collisions at RHIC using the STAR detector, identifying a potential new particle candidate.
Findings
Observed a narrow peak at 1734 MeV in $\Lambda K^0_s$ invariant mass
Peak has a statistical significance between 3 and 6 sigma
Potential candidate for $N^0$ or $\Xi^0$ pentaquark states
Abstract
We present preliminary results of the STAR experiment at RHIC on exotic particle searches in minimum bias Au+Au collisions at = 200 GeV. We observe a narrow peak at 1734 0.5 5 MeV in the invariant mass with width consistent with the experimental resolution of about 6 MeV within the errors. The statistical significance can be quantified between 3 and 6 depending on cuts and methods. If this peak corresponds to a real particle state it would be a candidate for the or the I=1/2 pentaquark states.
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