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- W2013338195 abstract "The pion cloud of the nucleon interacts with the valence quarks in the nucleon along the spin direction of the quarks. Thus one expects a specific strong interaction between the valence quarks and the pion cloud in and opposite to the direction of the spin. This can lead to a negative intrinsic deformation of the nucleon. Such an oblate intrinsic deformation of the nucleon could be measured in the photoexcitation of the Δ resonance from the proton. The Δ resonance decays by emitting a pion. Its angular distribution allows to determine the multipolarity of the photo or the electro excitation of the Δ resonance. The leading term is a magnetic dipole transition, but one finds also a strong longitudinal (C2) and transversal (E2) quadrupole excitation. This has been attributed to quadrupole deformed orbits of the valence quarks. The tensor force from pion or gluon exchange would admix to the single particle quark wave functions “d” states and allow a C2E2 transition. But this intrinsic quadrupole deformation is far too small and cannot explain the data. It is shown, that the pair current from pion and gluon exchange allows a double spin flip of two valence quarks, which describes a C2E2 transition. The so calculated Sachs form factor is in good agreement with recent data from Mainz, Bonn and Brookhaven.In the second part we study within the same model the possible formation of scalar-isoscalar and vector-isovector diquarks. It is first shown that an improved variational calculation yields the same results as the Fadeev approach. Models with gluon exchange show a stronger scalar-isoscalar diquark formation, compared to models without gluons. But in both cases the dynamical diquark formation seems not to be so strong, that diquarks can be treated for low energy phenomena as “elementary” particles." @default.
- W2013338195 created "2016-06-24" @default.
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- W2013338195 date "2000-03-01" @default.
- W2013338195 modified "2023-09-27" @default.
- W2013338195 title "Is the nucleon deformed?" @default.
- W2013338195 doi "https://doi.org/10.1016/s0146-6410(00)00071-5" @default.
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