Pion-nucleon amplitude near threshold: the sigma-term and scattering lengths beyond few loops

Fernando Simionato Perrotta,Valérie COMPAN,MAURO FRECCERO,Harald Aschauer,Daniil Kozlov,Olga Shlykova,Giovanni de Simone,Dr. Malla Balakrishna,Francesco Fidecaro,Isidoro Ferrante,Miguel Reinaldo Bonnett Del Alamo,Xiaomeng Wu,Angelina Dolgaya,Г.М. Флейшер,Ruben Gutierrez-Priego,Ekaterina Vargina,Simon Bober,Anzhelika Postol,Вячеслав Терентьев,Alexander Shipilov,Елена Власова,Zafar Zoidov,Александр Иванько,ivan lupandin,Jeroen Bergmann,Isabelle Chary-Valckenaere,Alexander Ivanov,Aleksandra Janas,Viacheslav Kashkin,Tran-Hieu Nguyen,Olga Lozovskaya,Tyler Herrington,Hiroyuki Yoshida,Atrayee Bandyopadhyay,Di Hu,Hiroko Kawai-Toyooka,Jing Tang,Юрий Лабынцев,Maryna Derkach,Andreas Scherer,AYODEJI OLUWASEYI ADULOJU,Olga N. 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