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SUMMARY:Nuclear Structure Functions from a Chiral Soliton
DTSTART;VALUE=DATE-TIME:19971119T110000Z
DTEND;VALUE=DATE-TIME:19971119T120000Z
DTSTAMP;VALUE=DATE-TIME:20260611T012908Z
UID:indico-event-1056@indico.ific.uv.es
DESCRIPTION:We study nucleon structure functions within the bosonized Namb
 u--Jona--Lasinio (NJL) model where the nucleon emerges as a chiral soliton
 . This attempts at merging the parton model description of deep inelastic 
 scattering with the phenomenologically successful picture of baryons as ch
 iral solitons. As examples we present the unpolarized structure functions 
 for the $\\nu p$ and $\\bar \\nu p$ scattering in the valence quark approx
 imation which is formulated such that the Adler sum rule is satisfied. Thi
 s approximation is justified for moderate constituent quark masses ($\\sim
  400 \\rm MeV $) for which the contribution of the valence quark level dom
 inates the nucleon properties. We also discuss the model predictions on th
 e Gottfried sum rule for electron nucleon scattering. A comparison with a 
 low--scale parametrization shows that the model reproduces the gross featu
 res of the empirical structure functions. In addition the issues of projec
 tion and $q^2$--evolution are addressed thereby determining the intrinsic 
 scale $\\mu^2$ of the NJL model. We also compute the leading twist contrib
 utions of the polarized structure functions $g_1$ and $g_2$ in this model.
  We compare the model predictions on these structure functions with data f
 rom the E143 experiment by evolving them from the scale $\\mu^2$ character
 istic for the NJL-model to the scale of the data. For this purpose a leadi
 ng order GLAP procedure is employed. Finally we include a discussion on th
 e projection of the model structure functions. The projection is mandatory
  for localized field configurations to enforce consistency with Lorentz--c
 ovariance.\n\nhttps://indico.ific.uv.es/event/1056/
LOCATION:Dpto. de Fisica Teorica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1056/
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