A rigorous bound on quark distributions in the nucleon

Details A rigorous bound on quark distributions in the nucleon A rigorous bound on quark distributions in the nucleon

2003-11-03

arxiv.org/abs/hep-ph/0311015v1

Nucl.Phys.Proc.Suppl.133:73-76,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the QCD03 Conference, Montpellier, 2-9 July 2003

Scientific paper

10.1016/j.nuclphysbps.2004.04.14

I deduce an inequality between the helicity and the transversity distribution of a quark in a nucleon, at small energy scales. Then I establish, thanks to the positivity constraint, a rigorous bound on longitudinally polarized valence quark densities, which finds nontrivial applications to d-quarks. This, in turn, implies a bound for the distributions of the longitudinally polarized sea, which is probably not SU(3)-symmetric. Some model predictions and parametrizations of quark distributions are examined in the light of these results.

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