Measurements of the γ*p → Δ reaction at low Q2 (CROSBI ID 201740)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Sparveris, N. ; Stave, S. ; Achenbach, P. ; Ayerbe Gayoso, C. ; Baumann, D. ; Bernauer, J. ; Bernstein, A.M. ; Böhm, R. ; Bosnar, Damir ; Botto, T. ; Christopoulou, A. ; Dale, D. ; Ding, M. ; Distler, M.O. ; Doria, L. ; Friedrich, J. ; Karabarbounis, A ; Makek, Mihael ; Merkel, H. ; Müller, U. ; Nakagawa, I. ; Neuhausen, R. ; Nungesser, L. ; Papanicolas, C.P. ; Piegsa, A. ; Pochodzalla, J. ; Potokar, M. ; Seimetz, M. ; Širca, S. ; Stiliaris, S. ; Walcher, Th. M. Weis
engleski
Measurements of the γ*p → Δ reaction at low Q2
We report new p(e, e'p)pi0 measurements in the Delta+(1232) resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.
electron scattering; pion production; chiral effective field theory
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Podaci o izdanju
49
2013.
136-142
objavljeno
1434-6001
10.1140/epja/i2013-13136-2
