caa a22 4500 465809316 CHVBK 20180323112111.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02902618 doi (NATIONALLICENCE)springer-10.1007/BF02902618 Gensini P. Dipartimento di Fisica dell'Università, Perugia aut Low-energy theorems on violations of the quark-line rule in scalar-isoscalar channels from low- Q 2 gluodynamics [Elektronische Daten] [P. Gensini] Теоремы при низких энергиях для нарушений правила кварковых линий в скаляризоскалярных каналах из глюодинамики при малых Q 2 Summary: Low-energy theorems are derived for two cases of violations of the quark-line rule in scalar-isoscalar, meson-meson channels from the hypothesis of dominance of the so-called <<longitudinal>> instantons, advanced for the dynamics of gluons in such channels by the ITEP school. The results seem in reasonable agreement with phenomenological information, and solve a long-standing puzzle in the <<accepted values>> for the sigma terms in a <<natural>> way (i.e. without further, specific assumptions on hadronic wave functions). Società Italiana di Fisica, 1990 12.38.Lg - Quantum chromodynamics. Other nonperturbative calculations nationallicence 13.25 - Hadronic decays of mesons nationallicence 13.75.Lb - Low-energy meson-meson interactions nationallicence Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 33-46 103:1<33 1990 103 40763 https://doi.org/10.1007/BF02902618 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02902618 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Gensini P. Dipartimento di Fisica dell'Università, Perugia aut NATIONALLICENCE 773 0- Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 33-46 103:1<33 1990 103 40763 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer