Heavy quark suppression via non-photonic electrons (IV)

• Models need too dense medium to account for observed suppression in data:

• Possible resolutions of the disagreement (or a combination of them ?):

• (1) Larger suppression of beauty …or charm dominance up to electron pT ≈ 10 GeV?

• (2) Extra gluon-fragmentation production of charm affected by energy loss ? (would also explain PHENIX proton-proton data ?)

• (3) Hadronic (+ partonic) energy loss ?

• (4) Radiative + collisional energy loss ? Other ... ?