Nucleon distribution amplitudes and their application to nucleon form factors and the N→Δ transition at intermediate values of Q2
Lenz, A.; Göckeler, M.; Kaltenbrunner, T.; Warkentin, N.
We compare a recent lattice determination of the nucleon distribution amplitudes with other approaches and models. We study the nucleon distribution amplitudes up to twist 6 in next-to-leading conformal spin and we also investigate conformal d-wave contributions to the leading-twist distribution amplitude. With the help of light-cone sum rules one can relate the distribution amplitudes to the form factors of the nucleon or the N→Δ transition at intermediate values of the momentum transfer. We compare our results with experimental data in the range 1 GeV2≤Q2≤10 GeV2. Keeping in mind that we are working only in leading order QCD and next-to-leading order QCD corrections might be sizeable, we already obtain a surprisingly good agreement for the nucleon form factors GnM, GpM, GpA, and GpT and for the N→Δ transition form factor ratios REM and RSM.
Lenz, A., Göckeler, M., Kaltenbrunner, T., & Warkentin, N. (2009). Nucleon distribution amplitudes and their application to nucleon form factors and the N→Δ transition at intermediate values of Q2. Physical Review D, 79(9), https://doi.org/10.1103/physrevd.79.093007
|Journal Article Type||Article|
|Publication Date||May 15, 2009|
|Deposit Date||Nov 19, 2012|
|Journal||Physical Review D|
|Publisher||American Physical Society|
|Peer Reviewed||Peer Reviewed|
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