Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-18
Nucl.Phys. A634 (1998) 141-165
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, LaTeX with epsfig.sty, 6 PostScript figures
Scientific paper
10.1016/S0375-9474(98)00132-8
We investigate the structure of constituent quarks and study implications for quark distribution functions of hadrons. Constituent quarks are constructed by dressing bare quarks with Goldstone bosons using the chiral quark model. We calculate resulting corrections to the twist-2 structure functions $f_1(x)$, $g_1(x)$ and $h_1(x)$. The Goldstone boson fluctuations produce a flavor asymmetry of the quark distribution in the nucleon in agreement with experimental data. They also generate significant depolarization effects which reduce the fraction of the nucleon spin carried by quarks. Corrections to the transversity spin structure function $h_1(x)$ differ from those to $g_1(x)$, and in particular we find a large reduction (40%) of the $d$-quark tensor charge, which is consistent with recent lattice calculations. We also study the pion structure function and find the momentum fraction carried by the sea quarks in the pion to be considerably larger than that in the nucleon.
Suzuki Kaori
Weise Wolfram
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