Parity violation in electron quasielastic scattering Kyungsik Kim School of Liberal Arts and Science, Korea Aerospace University, Korea 1.Introduction 2.Formalism 3.Results 4.Summary and conclusion APFB2011, Aug.

Use a relativistic single particle model  –  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. Ingredients : 1. Introduction The strangeness contents of the nucleon are investigated from parity violating electron scattering asymmetry in quasielastic region for 208 Pb nucleus. Goal :  PREX at JLab

2. Formalism  l  l   X Y Z N p P’ target   ll  q ) scattering plane reaction plane Kinematics : pP’

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

Parity violating weak response function Weak vector response function Weak axial vector response function  : Weinberg angle

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

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

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

Strangeness effect from protons without strangeness effect with strangeness

Strangeness effect from neutrons without strangeness effect with strangeness

Coulomb distortion

Coulomb distortion from protons

Coulomb distortion from neutrons

4. Summary and conclusion The effect of strangeness from neutrons is greater than that from protons. The effect of strangeness at forward angle is greater than that at backward angle to parity violating asymmetry in terms of energy transfer. 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 !