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Parity violation in electron quasielastic scattering

Parity violation in electron quasielastic scattering. Kyungsik Kim. School of Liberal Arts and Science, Korea Aerospace University, Korea. Introduction Formalism Results Summary and conclusion. APFB2011, Aug. 1. Introduction. Goal :.

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Parity violation in electron quasielastic scattering

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  1. Parity violation in electron quasielastic scattering Kyungsik Kim School of Liberal Arts and Science, Korea Aerospace University, Korea • Introduction • Formalism • Results • Summary and conclusion APFB2011, Aug.

  2. 1. Introduction Goal : The strangeness contents of the nucleon are investigated from parity violating electron scatteringasymmetry in quasielastic region for 208Pb nucleus.  PREX at JLab Ingredients : • Use a relativistic single particle model ( s–w model ) from • a relativistic mean field theory. • To include final state interaction, a relativistic mean field (RMF) is used, which guarantees current conservation and • gauge invariance. • Include the Coulomb distortion of the electrons.

  3. Y X reaction plane scattering plane f N P’ ql q Z (w, q ) target p 2. Formalism Kinematics : l( ) + A l( ) + N + (A-1) p P’

  4. + Transition Amplitude : Feynman diagrams Parity violating asymmetry is defined by : Electromagnetic response function

  5. Parity violating weak response function Weak vector response function Weak axial vector response function : Weinberg angle

  6. Nucleon current represents the Fourier transform given by bound state wave function in a relativistic single particle model using relativistic mean field ( s–w model ) . knocked out nucleon wave function by using the potential generated by a relativistic mean field (RMF). The relativistic nucleon weak currentoperator Weak vector form factors

  7. Strangeness form factors : strange magnetic moment Axial vector form factors for proton for neutron : disappear in NC reaction

  8. 3. Results Strangeness effect in forward and backward angles without strangeness effect with strangeness

  9. Strangeness effect fromprotons without strangeness effect with strangeness

  10. Strangeness effect from neutrons without strangeness effect with strangeness

  11. Coulomb distortion

  12. Coulomb distortion from protons

  13. Coulomb distortion from neutrons

  14. 4. Summary and conclusion • The effect of strangeness at forward angle is greater than that at backward angle to parity violating asymmetry in terms of energy transfer. • The effectof strangeness from neutrons is greater than that from protons . • The effect of Coulomb distortion exhibits clearly at forward angle but is very small at backward angle as expected. • In conclusion, parity violating asymmetry clearly shows strangeness effect although the effect is small. Thank you very much !

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