un 2 00 5 Medium modifications of nucleon electromagnetic form factors
نویسنده
چکیده
We use the Nambu-Jona-Lasinio model as an effective quark theory to investigate the medium modifications of the nucleon electromagnetic form factors. By using the equation of state of nuclear matter derived in this model, we discuss the results based on the naive quark-scalar diquark picture, the effects of finite diquark size, and the me-son cloud around the constituent quarks. We apply this description to the longitudinal response function for quasielastic electron scattering. RPA correlations, based on the nucleon-nucleon interaction derived in the same model, are also taken into account in the calculation of the response function.
منابع مشابه
0 50 50 05 v 1 2 M ay 2 00 5 A relativistic Glauber approach to polarization transfer in 4 He ( ~ e , e ′
Polarization-transfer components for He(~e, e~ p)H are computed within the relativistic multiplescattering Glauber approximation (RMSGA). The RMSGA framework adopts relativistic singleparticle wave functions and electron-nucleon couplings. The predictions with free and various parametrizations for the medium-modified electromagnetic form factors are compared to the world data. In conventional n...
متن کامل1 J un 2 00 7 Global Analysis of Nucleon Strange Form Factors at Low Q 2
The existence of a “sea” of quarks and antiquarks in the nucleon has been firmly established in deep-inelastic lepton scattering experiments as well as in the production of dilepton pairs (the Drell-Yan process). However, demonstrating the role of these q̄q pairs in the static electromagnetic properties of the nucleon has been a more elusive and difficult task. As the lightest quark that contrib...
متن کاملRole of color neutrality in nuclear physics: Modifications of nucleonic wave functions.
The influence of the nuclear medium upon the internal structure of a composite nucleon is examined. The interaction with the medium is assumed to depend on the relative distances between the quarks in the nucleon consistent with the notion of color neutrality, and to be proportional to the nucleon density. In the resulting description the nucleon in matter is a superposition of the ground state...
متن کامل- th / 9 70 60 43 v 1 1 8 Ju n 19 97 In - medium electron - nucleon scattering
In-medium nucleon electromagnetic form factors are calculated in the quark meson coupling model. The form factors are typically found to be suppressed as the density increases. For example, at normal nuclear density and Q 2 ∼ 0.3 GeV 2 , the nucleon electric form factors are reduced by approximately 8% while the magnetic form factors are reduced by only 1 − 2%. These variations are consistent w...
متن کاملar X iv : h ep - p h / 03 11 35 0 v 1 2 6 N ov 2 00 3 Radiative corrections to the neutron β − decay within the Standard Model
Radiative corrections to the neutron β−decay within the Standard Model. Abstract Starting with the basic Lagrangian of the Standard Model, the radiative corrections to the neutron β−decay are acquired. The electroweak interactions are consistently taken into consideration amenably to the Weinberg-Salam theory. The effect of the strong quark-quark interactions on the neutron β−decay is parameter...
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 2005