Proton sea quark flavour asymmetry and Roper resonance
نویسندگان
چکیده
منابع مشابه
Detailed Balancing and Sea-Quark Flavor Asymmetry of Proton
In this text, the protons are taken as an ensemble of Fock states. Using detailed balancing principle, some properties of intrinsic gluons and intrinsic sea quarks of proton involved statistics are gained without any parameter. A new origin of the light flavor sea-quark asymmetry is given here beside known models as Pauli blocking, meson-cloud, chiral-field, chiral-soliton and instantons. 12.40...
متن کاملDetailed Balance and Sea-Quark Flavor Asymmetry of Proton
In this study, the proton is taken as an ensemble of quark-gluon Fock states. Using the principle of detailed balance, the probabilities of finding every Fock states of the proton are obtained without any parameter. A new origin of the light flavor sea quark asymmetry, i.e., ū 6= d̄, is given as a pure statistical effect. It is found that d̄− ū ≈ 0.124, which is in surprisingly agreement with the...
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We discuss a new description for the Roper resonance, the first nucleon excited state of JP = 1/2+, in a model of strong diquark correlations. Treating the scalarisoscalar and axial-vector–isovector diquarks as independent degrees of freedom, two states having nucleon quantum numbers are constructed. Due to the scalar and axial-vector nature of the diquarks, the two nucleon states have differen...
متن کاملElectroproduction of the Roper resonance and the constituent quark model
A parameter-free evaluation of the N −P11(1440) electromagnetic transition form factors is performed within a light-front constituent quark model, using for the first time the eigenfunctions of a mass operator which generates a large amount of configuration mixing in baryon wave functions. A one-body electromagnetic current, which includes the phenomenological constituent quark form factors alr...
متن کاملElectroexcitation of the Roper resonance in the relativistic quark models
The amplitudes of the transition γ∗N → P11(1440) are calculated within light-front relativistic quark model assuming that the P11(1440) is the first radial excitation of the 3q nucleon state. The results are compared with those obtained in close approaches by other authors and with standard nonrelativistic calculations. One of the reasons for this study was to present all these results within u...
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ژورنال
عنوان ژورنال: Chinese Physics C
سال: 2012
ISSN: 1674-1137
DOI: 10.1088/1674-1137/36/3/001