Nota de FísicaPublicado
Diffractive Leptoproduction of Small Masses in QCD
1996
Dados da publicação
- Autores
- —
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1996
- Descrição
- In this paper we consider the process of diffraction dissociation in deeply inelastic scattering in the region of small produced mass, which we define as production of <math>\bar{q} q\,\!</math> -pair and <math>\bar{q} q\,\!</math> <math>G\,\!</math> system in the final state. We show that the small distance contributions <math>(r _{\perp} \propto 1/Q)\,\!</math> to the longitudinal polarised virtual photon dominate. Formulae for the cross section using the gluon structure function are written within the framework of perturbative QCD. It is shown that the production of small masses by the transverse polarised photon is concentrated at moderate values of <math>r _{\perp} \sim 1 GeV^{-1}\,\!</math>, where the pQCD approach can be applied. This could be responsible for a considerable part of the diffractive production. It is shown that only <math>\bar{q} q\,\!</math> pair production contribute to the diffraction dissociation at <math>\beta > 0.4\,\!</math>, the possibility to extract the value of the gluon structure function from the measurements in this kinematic region is discussed. The evolution of the DD structure function is studied, and a solution to the DD evolution equations is proposed. Shadowing corrections are discussed for both the transverse and longitudinal polarised photon, and estimates of the different damping factors are given. The relation between diffractive production and the corrections to <math>F_2\,\!</math>, is alluded to.
- Ano
- 1996
- Número
- CBPF-NF-021/96
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não