Measurement of the $\vec{n}p\to d{\pi }^0{\pi }^0$ Reaction with Polarized Beam in the Region of the $d^{\ast }(2380)$ Resonance

Abstract

We report on a high-statistics measurement of the most basic double pionic fusion reaction $\vec{n}p\to d{\pi }^0{\pi }^0$ over the energy region of the $d^{\ast }(2380)$ resonance by use of a polarized deuteron beam and observing the double fusion reaction in the quasifree scattering mode. The measurements were performed with the WASA detector setup at COSY. The data reveal substantial analyzing powers and confirm conclusions about the $d^{\ast }$ resonance obtained from unpolarized measurements. We also confirm the previous unpolarized data obtained under complementary kinematic conditions.

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• A new possibility for light-quark Dark Matter
• An Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction?
• Electromagnetic properties of the $d^{\ast }(2380)$ hexaquark
• The legacy of the experimental hadron physics programme at COSY
• Is $d^{\ast }(2380)$ a compact hexaquark state?
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• On the Production of an Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction
• Resonance $d^{\ast }(2380)$ and higher isospin states
• On Sequential Single-Pion Production in Double-Pionic Fusion