Abstract
We report the first observation of the double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The mass and width are measured to be 1610.4±6.0(stat)_{-4.2}^{+6.1} (syst) MeV/c^{2} and 59.9±4.8(stat)_{-7.1}^{+2.8}(syst) MeV, respectively. We obtain 4.0σ evidence of the Ξ(1690)^{0} with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S=-2.
Highlights
We report the first observation of the double strange baryon Ξð1620Þ0 in its decay to Ξ−πþ via Ξþc → Ξ−πþπþ decays based on a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetricenergy eþe− collider
In this Letter, we study the decay Ξþc → ΞÃ0πþ, ΞÃ0 → Ξ−πþ based on a data sample collected with the Belle detector at the KEKB asymmetric-energy eþe− (3.5 on 8 GeV) collider [17]
The Ξð1530Þ0 and Ξð1690Þ0 signals are modeled with P- and S-wave relativistic Breit-Wigner functions convolved with a fixed Gaussian resolution function of width 1.38 and 2.04 MeV=c2, respectively, as determined from the Monte Carlo (MC) simulation
Summary
We report the first observation of the double strange baryon Ξð1620Þ0 in its decay to Ξ−πþ via Ξþc → Ξ−πþπþ decays based on a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetricenergy eþe− collider. In this Letter, we study the decay Ξþc → ΞÃ0πþ, ΞÃ0 → Ξ−πþ based on a data sample collected with the Belle detector at the KEKB asymmetric-energy eþe− (3.5 on 8 GeV) collider [17]. We generate MC events for the nonresonant three-body decay Ξþc → Ξ−πþπþ with a uniform distribution in phase space.
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