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Sample text
Thus, the initially-produced heavy quarks experience the full collision history. 2. Predictivity by pQCD: this is another consequence of the large mass (compared to ΛQCD ). 1 we show the main production channels and the general lines followed for the cross section calculations in proton–proton collisions. 3. Strong nuclear effects: both initial and final state effects are expected to enter in the production and propagation of heavy quarks, respectively; consequently, they are information-rich probes.
11 [57]. The calculated electron spectra show reasonable agreement, within the relatively large errors, with the data both for the minimum-bias sample and for the cen√ tral one. A similar agreement is shown also by the data at sNN = 200 GeV, where the contribution of photon conversions was directly estimated in a special run with an additional ‘converter layer’ of well defined geometry and material thickness [58]. 3, PHENIX reports for high-pt hadrons in central Au–Au collisions a substantial suppression relative to binary scaling.
A similar agreement is shown also by the data at sNN = 200 GeV, where the contribution of photon conversions was directly estimated in a special run with an additional ‘converter layer’ of well defined geometry and material thickness [58]. 3, PHENIX reports for high-pt hadrons in central Au–Au collisions a substantial suppression relative to binary scaling. Such effect seems not to be present (errors are still large) in the single electrons from charm. 3. In the near future, the NA60 experiment will probably clarify the issue of charm production in nucleus–nucleus collisions at SPS energy and more precise measurements, including also the comparison with pp and pA collisions, will be √ performed in the energy domain sNN ∼ 100-200 GeV by PHENIX.
Charm Production and in-Medium QCD Energy Loss with ALICE [thesis] by A. Dainese
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