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Resonance contribution to the moments of the structure function F2 at small Q2 | | M. Osipenko
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25 Jul 2003 | | Subject: | hep-ph | | Abstract: | We address the issue of the role of nucleon excited states in the twist expansion of the nucleon structure function moments. The contribution to the forward Compton scattering amplitude originated from resonance poles, situated on a separate Riemann sheet, is not included in the standard Operator Product Expansion procedure. This part of the amplitude has to be subtracted from the total moments before making a comparison to QCD predictions. The lowest limit where the resonance contribution to n-th moment of the structure function F2 can be neglected is estimated as Q2>M2(1+0.3(n-2)). Below this limit any higher twist extraction from total inclusive moments is affected by the significant impact of the resonance poles. | | Source: | arXiv, hep-ph/0307316 | | Services: | Forum | Review | PDF | Favorites | |
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