## Differential cross section and analysing power of the quasi-free $pn -{pp}_s \pi^-$ reaction at 353 MeVстатья

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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.

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 [1] Differential cross section and analysing power of the quasi-free pn -{pp}_s π- reaction at 353 mev / S. Dymov, T. Azaryan, S. Barsov et al. // Physics Letters B. — 2012. — Vol. 712. — P. 375–379. In order to test chiral perturbation theory and establish links between p-wave pion production in nucleon–nucleon collisions and low energy three-nucleon scattering, an extensive programme of experiments on pion production is currently underway at COSY-ANKE. The final proton pair is measured at very low excitation energy, leading to an S-wave diproton, denoted here as {pp}s. By using a deuterium target we have obtained data on the differential cross section and analysing power of the quasi-free reaction at 353 MeV. The spectator proton psp was either measured directly in silicon tracking telescopes or reconstructed using the momentum of a detected π−. Both observables can be described in terms of s-, p-, and d-wave pion production amplitudes. Taken together with the analogous data on the reaction, full partial wave decompositions of both processes were carried out. [ DOI ]