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High pT suppression: Reaction-plane dependence
- 2 times more suppression out-of-plane (“long” direction)
- than in-plane (“short” direction).
- Glauber parton energy loss model predicts only ~50% increased “out-of-plane” vs “in-plane” π0 emission
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- Azimuthal anisotropy not reproduced by “canonical” L2
- (or L) path-length dependence.