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Article Dans Une Revue Physical Review Letters Année : 2010

Precision Determination of the dπ↔NN Transition Strength at Threshold

Résumé

n unusual but effective way to determine at threshold the dπ↔NN transition strength α is to exploit the hadronic ground-state broadening Γ1s in pionic deuterium, accessible by x-ray spectroscopy. The broadening is dominated by the true absorption channel dπ-→nn, which is related to s-wave pion production pp→dπ+ by charge symmetry and detailed balance. Using the exotic atom circumvents the problem of Coulomb corrections to the cross section as necessary in the production experiments. Our dedicated measurement finds Γ1s=(1171-49+23)  meV yielding α=(252-11+5)  μb.

Dates et versions

hal-00537623 , version 1 (18-11-2010)

Identifiants

Citer

Th. Strauch, F. D. Amaro, Dimitri Anagnostopoulos, P. Buhler, Daniel S. Covita, et al.. Precision Determination of the dπ↔NN Transition Strength at Threshold. Physical Review Letters, 2010, 104 (14), pp.142503. ⟨10.1103/PhysRevLett.104.142503⟩. ⟨hal-00537623⟩
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