Abstract
We have measured the cross section for π − + 4 He→ π − + 3 H+p at 5 GeV/c incident pion momentum. The momentum transfer to the pion was in the region 0.005≦| t ππ |≦0.15 (GeV/ c) 2 and the triton recoil momentum in the region 0.24 ≦ p t ≦ 0.60 GeV/ c. A theoretical model including final-state interactions has also been developed. Strong final-state interactions prohibit a direct extraction of the relative proton-triton bound-state wave function. Nevertheless, we are able to conclude that the wave function remains positive for relative proton-triton momenta up to at least 0.6 GeV/ c. This result questions the relevance of wave functions derived from the helium electromagnetic form factor.
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