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Phenomenology of the proton spin
Authors:MVN Murthy  V Ravindran
Institution:(1) The Institute of Mathematical Sciences, 600 113 Madras, India
Abstract:We analyze the various inputs that go into computing the recently measured first moment of the proton spin structure functiong 1 p (x). The basic inputs are the various valence and sea quark polarisations and the gluonic contribution coming through axial anomaly. We show that the quark model predictions for valence quark polarisations, suitably modified to accommodate Bjorken sum rule, are consistent with measured value of moment of the spin structure function.
Keywords:Structure functions  polarization  sum rules  quantum chromodynamics
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