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 $d^*(2380)$ 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 $d^*$ resonance obtained from unpolarized measurements. We also confirm the previous unpolarized data obtained under complementary kinematic conditions.
Highlights
As has been pointed out previously by Harney [1], finite vector analyzing powers Ay(Θ) arise in reaction processes only, if at least two different partial waves interfere
We report on a high-statistics measurement of the most basic double-pionic fusion reaction np → dπ0π0 over the energy region of the d∗(2380) resonance by use of a polarized deuteron beam and observing the double fusion reaction in the quasifree scattering mode
The data reveal substantial analyzing powers and confirm conclusions about the d∗ resonance obtained from unpolarized measurements
Summary
As has been pointed out previously by Harney [1], finite vector analyzing powers Ay(Θ) arise in reaction processes only, if at least two different partial waves interfere. In case of an isolated s-channel resonance, which is formed by a single partial wave matching to spin and parity of the resonance, the analyzing powers in the resonance region will be vanishing small, if there is no sizeable interfering background from other reaction processes. In the reaction pn → dπ0π0 a pronounced, narrow resonance structure corresponding to a mass of
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