Charm - anti-charm asymmetries in high-energy photoproduction

photon nucleus; inclusive reaction; beryllium; quark; charm; pair production; fragmentation; charmed particle; photoproduction; hadronic decay; particle antiparticle; asymmetry; model; nonperturbative; mass spectrum; transverse momentum; spectra; D+; D*(2010); D/s+; Lambda/c+; magnetic spectrometer; experimental results; Batavia TEVATRON PS; D+ --> K- 2pi+; D0 --> K- pi+; D0 --> K- 2pi+ pi-; D/s+ --> K+ K- pi+; Lambda/c+ --> p K- pi+