The Valence Quark Distribution of the Pion

Details The Valence Quark Distribution of the Pion The Valence Quark Distribution of the Pion

2002-08-19

arxiv.org/abs/hep-ph/0208173v1

eConf C020620 (2002) THAP01

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented by J. P. Lansberg at the XXII Physics in Collision Conference (PIC02), Stanford, California, June 20-22, 2002, 3 pag

Scientific paper

The pion structure function is investigated in a simple model, where the pion and its constituent quark fields are coupled through the simplest pseudoscalar coupling. The imaginary part of the forward gamma* pi -> gamma* pi scattering amplitude is evaluated and related to the structure functions. It is shown that the introduction of non-perturbative effects, linked to the size of the pion, allows a connection with the quark distribution. It is predicted that higher-twist terms become negligible for Q^2 larger than ~2 GeV^2, that quarks in the pion have a momentum fraction smaller than in the proton case, and that the momentum sum rule is violated for the pion.

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