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Both charged hadrons and D mesons are considered to be excellent probes ofQCD matter created in ultra relativistic heavy ion collisions. Surprisingly,recent experimental observations at LHC show the same jet suppression for thesetwo probes, which - contrary to pQCD expectations - may suggest similar energylosses for light quarks and gluons in QCD medium. We here use our recentlydeveloped energy loss formalism in a finite size dynamical QCD medium toanalyze this phenomenon that we denote as the "heavy flavor puzzle at LHC". Weshow that this puzzle is a consequence of an unusual combination of thesuppression and fragmentation patterns, and in fact does not require invokingthe same energy loss for light partons. Furthermore, we show that thiscombination leads to a simple relationship between the suppressions of lighthadrons and D mesons and the corresponding bare quark suppressions.Consequently, a coincidental matching of jet suppression and fragmentationallows considerably simplifying the interpretation of the correspondingexperimental data.

Heavy flavor puzzle at LHC: a serendipitous interplay of jet suppression and fragmentation