Author/Authors :
Oset، نويسنده , , E. and Dِring، نويسنده , , M. and Strottman، نويسنده , , D. and Jido، نويسنده , , D. and Napsuciale، نويسنده , , M. S. Sasaki، نويسنده , , K. and Vaquera-Araujo، نويسنده , , C.A. and Kaskulov، نويسنده , , M. and Hernandez، نويسنده , , E. and Nagahiro، نويسنده , , H. and Hirenzaki، نويسنده , , S.، نويسنده ,
Abstract :
In these lectures I will show some results obtained with the chiral unitary approach applied to the photo- and electro-production of mesons. The results for the photo-production of η π 0 p and K 0 π 0 Σ + , together with related reactions will be shown, having with common denominator the excitation of the Δ ( 1700 ) resonance which is one of those dynamically generated in the chiral unitary approach. Then I will show the results obtained for the e + e − → ϕ f 0 ( 980 ) reaction which reproduce the bulk of the data except for a pronounced peak, giving support to a new mesonic resonance, X(2175). Results will also be shown for the electromagnetic form factors of the N ∗ ( 1535 ) resonance, also dynamically generated in this approach. Finally, I will show some results on the photo-production of the ω in the nuclei, showing that present experimental results claiming a shift of the ω mass in the medium are tied to a particular choice of background and are not conclusive. On the other hand, the same experimental results show unambiguously a huge increase of the ω width in the nuclear medium.
