Gluon Helicity Distribution
Inclusive Prompt Photon Production
- theoretically reasonably well-understood process
LO and NLO; spin averaged and difference
- Experimental difficulty can be overcome
Inclusive p0 Production
- Experimentally rather easy; hi-stat measurement
- Penalty of fragmentation uncertainty
Open Heavy Flavor Production
- Hi-stat measurement; negatively large aLL
- Possible cancellation at NLO is pointed out
Quarkonium Production
- Identification easy; hi-stat
- Uncertainty in Production Mechanism