Progress in NN --> NNpi

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dc.creatorBaru, V.
dc.creatorHaidenbauer, J.
dc.creatorHanhart, C.
dc.creatorKudryavtsev, A.
dc.creatorLensky, V.
dc.creatorMeissner, U. -G.
dc.date2007-11-17
dc.date.accessioned2026-07-07T11:54:15Z
dc.date.available2026-07-07T11:54:15Z
dc.descriptionWe survey the recent developments in the reaction $NN \to NNπ$ in effective field theory. We show that the proper construction of the production operator needs a careful separation of irreducible pieces from reducible ones. The result of this consideration is a complete cancellation of all loops in the production operator at NLO. Moreover, we show that this procedure brings the leading Weinberg-Tomozawa vertex on-shell, thus enhancing the corresponding contribution to the transition amplitude by a factor of 4/3 as compared to the commonly used value. We also discuss the role of the $Δ(1232)$ for the s-wave pion production. Being relatively sizable individually the direct and rescattering mechanisms of the $Δ$ excitation at NLO cancel each other to a large extent. Thus, we conclude that the net effect of the $Δ$ at NLO is very small.
dc.description10 papes, 7 figures. Invited talk to the 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Sept. 10th-14th 2007 (MENU 2007), Juelich, Germany
dc.identifierhttps://arxiv.org/abs/0711.2748
dc.identifierhttp://arxiv.org/abs/0711.2748
dc.identifierECONFC070910:128,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204834
dc.subjectNuclear Theory
dc.titleProgress in NN --> NNpi
dc.typetext

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