TY - JOUR

T1 - Chiral constituent quarks and their role in quark distribution functions of nucleon and pion

AU - Suzuki, K.

AU - Weise, W.

N1 - Funding Information:
High energy experiments such as lepton-hadron deep inelastic scattering and the Drell-Yan process provide detailed knowledge of the quark and gluon distributions of hadrons. One obtains information about the momentum distribution functions of valence quarks, sea quarks and gluons, and their scaling violations are quite consistent with predictions from perturbative QCD \[1 \]. Even under these circumstances, we still have a * This work is supported in part by BMBE \]A lexander von Humboldt fellow, e-mail [email protected].

PY - 1998/5/4

Y1 - 1998/5/4

N2 - 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 f1(x), g1(x) and h1(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 h1(x) differ from those to g1(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.

AB - 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 f1(x), g1(x) and h1(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 h1(x) differ from those to g1(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.

KW - Constituent quark model

KW - Deep inelastic scattering

KW - Goldstone boson

KW - Nucleon spin structure

UR - http://www.scopus.com/inward/record.url?scp=0032481937&partnerID=8YFLogxK

U2 - 10.1016/S0375-9474(98)00132-8

DO - 10.1016/S0375-9474(98)00132-8

M3 - Article

AN - SCOPUS:0032481937

SN - 0375-9474

VL - 634

SP - 141

EP - 165

JO - Nuclear Physics, Section A

JF - Nuclear Physics, Section A

IS - 1-2

ER -