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Report No.

Possibility of a new narrow $$Lambda^*$$ resonance near the $$Lambda eta$$ threshold

Tanida, Kiyoshi

Evidence for a narrow $$Lambda^*$$ resonance at a mass of about 1665 MeV (just above the combined mass of the $$Lambda$$ ground state plus the $$eta$$ meson) has been seen in the $$M(pK^-)$$ mass of the Dalitz plot for $$Lambda_c to pK^-pi^+$$ decay at the Belle experiment. Additional evidence for this resonance is found in the partial-wave analysis (PWA) of data on $$K^- p$$ reactions done independently by several groups, driven by angular distributions of the $$K^- p to Lambdaeta$$ reaction by the Crystal Ball collaboration. If a narrow $$Lambda^*$$ resonance exists at this mass, then the conventional quark model cannot explain it, and a possible explanation is that it is a crypto-exotic baryon with a dominant meson-baryon component to its wave function. Therefore we have proposed a definitive experiment for $$K^- p to Lambda eta$$, using the newly built hypTPC detector to establish the existence of the proposed narrow $$Lambda(1665)$$ and determine its spin and parity in just two weeks of beamtime at J-PARC (E72). We will discuss these evidences for the proposed $$Lambda^*$$ resonance and introduce the E72 experiment.



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