Isoscalar off-shell effects in threshold pion production frompdcollisions
نویسندگان
چکیده
منابع مشابه
Compton scattering by a pion and off-shell effects.
We consider Compton scattering by a pion in the framework of chiral perturbation theory. We investigate off–shell effects in the s– and u–channel pole diagrams. For that purpose we perform a field transformation which, in comparison with the standard Gasser and Leutwyler Lagrangian, generates additional terms at order p4 proportional to the lowest–order equation of motion. As a result of the eq...
متن کاملCompton scattering from a pion and off – shell effects ∗
We discuss the most general form of the electromagnetic vertex of an off–shell pion. The framework of chiral perturbation theory is used to illustrate the representation dependence of the electromagnetic three–point Green's function. For that purpose we discuss the concept of field transformations which, in comparison with the standard Gasser and Leutwyler Lagrangian, generate equivalent Lagran...
متن کاملOff - shell effects on particle production ∗
We investigate the observable effects of off-shell propagation of nucleons in heavy-ion collisions at SIS energies. Within a semi-classical BUU transport model we find a strong enhancement of subthreshold particle production when off-shell nucleons are propagated. During the past 15 years semi-classical transport models have extensively and quite successfully been applied to the description of ...
متن کاملOff-shell effects in dilepton production from hot interacting mesons
The production of dielectrons in reactions involving a1 mesons and pions is studied. We compare results obtained with different phenomenological Lagrangians that have been used in connection with hadronic matter and finite nuclei. We insist on the necessity for those interactions to satisfy known empirical properties of the strong interaction. Large off-shell effects in dielectron production ar...
متن کاملThreshold Pion Production at Large Momentum Transfers
We consider threshold pion electroproduction on a proton target for photon virtualities in the region 1 − 10 GeV. The S-wave multipoles at threshold, E0+ and L0+, are calculated using light-cone sum rules.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review C
سال: 2000
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.61.064009