Non - perturbative effect in the nucleon structure function and the Gottfried sum ∗
نویسندگان
چکیده
We investigate the non-perturbative effect in the nucleon structure function and the Gottfried sum by using a non-perturbative quark propagator with lowest dimensional condensate contributions from the QCD vacuum. It is shown that the non-perturbative effect modifies the conventional quarkparton model formula of the nucleon structure function at finite Q2 and suggests a non-trivial Q2 dependence in the Gottfried sum. This work is supported by National Natural Science Foundation of China. Mailing address. Email address: [email protected]
منابع مشابه
Nucleon Structure Functions within a Chiral Soliton Model ∗
We study nucleon structure functions within the bosonized Nambu–Jona–Lasinio model where the nucleon emerges as a chiral soliton. We discuss the model predictions on the Gottfried sum rule for electron–nucleon scattering. A comparison with a low–scale parametrization shows that the model reproduces the gross features of the empirical structure functions. We also compute the leading twist contri...
متن کاملNuclear Effects on the Extraction of Neutron Structure Functions
Nuclear effects in light nuclei due to the presence of spin-one isosinglet 6-quark clusters are investigated. The quark distributions of 6-quark clusters are obtained by using a perturbative QCD (pQCD) based framework, which allows us to get a good description of the ratio of the deuteron structure function to the free nucleon structure function. Nuclear effects on the extraction of the neutron...
متن کاملAnomalous Evolution of the Gottfried Sum
We discuss nonperturbative QCD evolution of nonsinglet nucleon structure functions, with particular application to the Gottfried sum. We show that the coupling of the quark partons to bound state mesons leads to nonperturbative contributions to the Altarelli– Parisi equations which, due to the axial anomaly, result in a strong scale dependence of nonsinglet structure functions for values of Q a...
متن کاملMesons and the Structure of Nucleons *
The role of mesons, particularly the pion, in the structure of nucleons is reviewed and investigated. Since quark-antiquark pairs are likely to " transform " into mesons at large distances, mesons are expected to contribute to nucleon structure. Their effects on the Gottfried sum rule, on the strangeness content of the nucleon, and on the spin of the nucleon are discussed.
متن کاملOff-shell pion structure function and flavor asymmetry in the nucleon sea
We study off-shell effects of the pion cloud on the sea quark distribution in the nucleon. The structure function of the off-mass-shell pion is obtained within the Nambu and Jona-Lasinio model, where the shape of the distribution function depends on the pion momentum. By using the momentum dependent pion structure function, the SU(2) flavor asymmetry in the nucleon see is reexamined within the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996