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17 papers · 2 filters
The and Transitions in the Extended NJL Model
Johan Bijnens, Ansar Fayyazuddin, Joaquim Prades
We calculate within the Extended Nambu--Jona-Lasinio model the leading in contribution to to all orders in the external momenta and quark masses. This result…
Nuclear Effects in Charm Production
Paul Hoyer
I briefly review our understanding of the nuclear target dependence of charm and charmonium production, in view of charm physics at Elfe.
Elastic scattering to two loops
J. Bijnens, G. Colangelo, G. Ecker +2
We evaluate analytically the elastic scattering amplitude to two loops in chiral perturbation theory and give numerical values for the two --wave scattering lengths and for…
as the Topological Origin of B+L Violation in the Hot Electroweak Theory
Minos Axenides, Andrei Johansen, Holger Bech Nielsen +1
The space of static finite-energy configurations in the electroweak theory admits a topological structure. More precisely, we show that this space contains two disconnected s…
Analysis of the Hadronic Light-by-Light Contributions to the Muon
Johan Bijnens, Elisabetta Pallante, Joaquim Prades
We calculate the hadronic light-by-light contributions to the muon . We use both and chiral counting to organize the calculation. Then we calculate the leading and nex…
Interactions on Nuclei
Paul Hoyer
I review hard photon initiated processes on nuclei. The space-time development of the DIS reaction as viewed in the target rest frame qualitatively describes the nuclear shadowing…