Strangeness Form Factors of the Proton in the Chiral Quark Model

The chiral quark model describes the strangeness components of the light quarks as fluctuations into strange mesons and quarks. The single strange pseudoscalar and vector meson loop fluctuations of the constituent $u$- and $d$-quarks give rise to only very small strangeness form factors for the proton. This result is in line with recent experimental results, given their wide uncertainty range.Comment: 15 pages RevTeX, 6 figures (PS

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Kommentti Merike Helanderin ja Anna-Elina Rahikaisen kirjoitukseen SLL 71(14):1008-1010, 201

Mesonic Anapole Form Factors of the Nucleons

The chiral quark model posits pseudoscalar and vector meson couplings to constituent quarks. The parity violating meson-quark couplings lead to anapole moments and form factors of the nucleons. These arise both as parity violating meson loop fluctuations as well as exchange currents and polarization currents that are induced by the parity violating interaction between quarks. Because of cancellations between the different contributions the magnitude of the calculated anapole moments is only of the order $\sim 10^{-8}$ and is determined mainly by magnitude of the parity-violating meson-nucleon coupling constants.Comment: Figure 8 correcte

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