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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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Presentation Transcript
slide1

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.

slide2

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.
slide3

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’

slide4

+

Transition Amplitude :

Feynman diagrams

Parity violating asymmetry is defined by :

Electromagnetic response function

slide5

Parity violating weak response function

Weak vector response function

Weak axial vector response function

: Weinberg angle

slide6

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

slide7

Strangeness form factors

: strange magnetic moment

Axial vector form factors

for proton

for neutron

: disappear in NC reaction

slide8

3. Results

Strangeness effect in forward and backward angles

without strangeness effect

with strangeness

slide9

Strangeness effect fromprotons

without strangeness effect

with strangeness

slide10

Strangeness effect from neutrons

without strangeness effect

with strangeness

slide14

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 !