Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-07-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 5 figures
Scientific paper
We discuss the role of nucleon and its excited state poles in the twist expansion of the nucleon structure function moments. We find that the nucleon pole contribution was overestimated in previous analyses by a factor of two. Inclusion of this missing factor makes the duality appear for all moments at least down to Q2=1 GeV2. For resonance poles the time reversal invariance together with unitarity demand at least four of them in the forward Compton scattering amplitude. These poles as well as the elastic pole can be propagated separately through the standard Operator Product Expansion derivation for DIS. This part of the amplitude gives a coherent, positive, higher twist contribution, which can be singled out of the total and compared with the remaining one given mostly by threshold effects. A comparison of the estimated resonance contribution to the data on structure function moments allows to test large-Q2 behavior of proton-resonance transition form-factors.
No associations
LandOfFree
Elastic and Resonance contributions to moments of the proton structure function F2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Elastic and Resonance contributions to moments of the proton structure function F2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic and Resonance contributions to moments of the proton structure function F2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-445072