caa a22 4500 445871784 CHVBK 20180317145514.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1140/epja/i2011-11012-9 doi (NATIONALLICENCE)springer-10.1140/epja/i2011-11012-9 Chiral perturbation theory calculation for pn $ \rightarrow$ d$ \pi$ $ \pi$ at threshold [Elektronische Daten] [B. Liu, V. Baru, J. Haidenbauer, C. Hanhart] Abstract.: We investigate the reaction pn $ \rightarrow$ d $ \pi$ $ \pi$ in the framework of Chiral Perturbation Theory (ChPT). For the first time a complete calculation of the leading-order contributions is presented. We identify various diagrams that are of equal importance as compared to those recognized in earlier works. The diagrams at leading order behave as expected by the power counting. Also for the first time the nucleon-nucleon interaction in the initial, intermediate and final state is included consistently and found to be very important. Although the perturbative series for the production operator is expected to converge very slowly, this study provides the theoretical basis for a future evaluation of the non-resonant contributions in two-pion production reactions in nucleon-nucleon collisions. SIF, Springer-Verlag Berlin Heidelberg, 2011 Liu B. School of Science, Xian Jiaotong University, 710049, Xian, China aut Baru V. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut Haidenbauer J. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut Hanhart C. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut The European Physical Journal A Springer-Verlag 47/1(2011-01-01), 1-12 1434-6001 47:1<1 2011 47 10050 https://doi.org/10.1140/epja/i2011-11012-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epja/i2011-11012-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu B. School of Science, Xian Jiaotong University, 710049, Xian, China aut NATIONALLICENCE 700 1- Baru V. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 700 1- Haidenbauer J. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 700 1- Hanhart C. Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 773 0- The European Physical Journal A Springer-Verlag 47/1(2011-01-01), 1-12 1434-6001 47:1<1 2011 47 10050 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer