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Paper   IPM / Particles / 11301
School of Particles and Accelerator
  Title:   Low Q2 proton structure function, using gluon and pseudoscalar meson clouds in the constituent quark framework
  Author(s): 
1.  Abolfazl Mirjalili
2.  Mohammad Mehdi Yazdanpanah
3.  Fatemeh Taghavi Shahri
4.  Karim Ghorbani
  Status:   Published
  Journal: J. Phys. G
  No.:  105003
  Vol.:  37
  Year:  2010
  Pages:   1-14
  Supported by:  IPM
  Abstract:
The idea of the meson cloud approach in the chiral quark model has been extended to include gluon cloud in order to achieve the parton densities in the nucleon, based on the constitute quark framework. The splitting function of the quark to the quark-meson and quark-gluon at low Q2 value are used to obtain parton densities in the constituent quark. The phenomenological constituent model is employed to extract the parton distributions in the proton at low Q2 value. Since we have access to the parton densities at low Q2, we are able to obtain F2(x,Q2) structure function at low Q2 value. The result is in good agreement with available experimental data and some theoretical models. To confirm the validity of our calculations,the fraction of total momentum of proton which is carried by gluon at high Q2 and also the Gottfried sum rule are computed. The results are in good agreement with what are expected.

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