Opportunities in nucleon spin physics. Xiangdong Ji University of Maryland. — Seminar , CERN, Dec. 15, 2005 —. Outline. Historical Remarks Polarized gluon distribution Δ g Orbital angular momentum & GPDs Transversity Conclusion. Historical remarks .
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nucleon spin physics
University of Maryland
— Seminar, CERN, Dec. 15, 2005—
A very small fraction of the proton spin
is carried by the spin of the quarks!
Barone et al., PRB431,1998
ΔΣ/2 + Δg + Lz = ½
if Δg is very large, there must be a large negative Lz to cancel this---(fine tuning) Δg <0.5?
Study of orbital motion of the electron in H led to quantization rules: Bohr
Prog. Nucl. Part.
Phys. 2001A Key Observation
In a GPD model in which
angular momentum fraction Jq
Is a parameter, the asymmetry
can be studied as a function
A joint distribution in momentum and coordinate spaces
or squeezed light!
x3D images of quarks at fixed x
Most interesting ones are related to phenomena of
Which is the killer argument?
It will take a lot of more effort to measure the
transversity distribution than other twist-2s!