Seeking Partonic Pictures of Proton Spin

Details Seeking Partonic Pictures of Proton Spin Seeking Partonic Pictures of Proton Spin

2012-02-13

arxiv.org/abs/1202.2843v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

We analyze the proton's longitudinal and transverse spin in terms of parton's spin and orbital angular momentum contributions in the infinite momentum frame, emphasizing experiment measurability. The simple partonic sum rule is shown to exist only for the transverse polarization and is related to the twist-two generalized parton distributions (GPD's). The longitudinal spin, however, necessarily involves parton transverse momentum and parton correlations. In a gauge-invariant approach, parton contributions to the proton helicity are shown to be related to twist-two and -three GPD's and are amenable to lattice QCD calculations. A simpler but subtler parton picture emerges in a light-cone gauge approach through a quantum phase-space Wigner distribution.

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