How High is High x?

Details How High is High x? How High is High x?

2004-11-22

arxiv.org/abs/hep-ph/0411290v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented at HIX 2004, Marseille July 23-26, 2004

Scientific paper

10.1063/1.1871646

A general three quark bound state satisfying the Pauli principle, and conserving angular momentum and isospin, is used to investigate the spin structure of nucleons at high $x$. It is shown that, if a spin up quark dominates as $x$$\to$1 for a spin up proton, it must be a u quark. Then both $A_{1p}$ and $A_{1n}$, as well as the quark spin distribution $\Delta u/u$, will approach 1 as $x$$\to$1. The spin distribution $\Delta d/d$ does not approach 1, but is bound by the limits $-{1/3}\le\Delta d/d\le 0$ for any $x$. The ratio {$F_{1n}/F_{1p}$ will approach 1/4} (not3/7).

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