By Ingo Schienbein
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Extra resources for Heavy quark production in CC and NC DIS and the structure of real and virtual photons in NLO QCD
Sample text
They are not physically observable and only sensible if they are added to the QS (0) Born term (dashed) as in Eqs. 15). We have perturbatively resummed all logarithms of the charm mass via massless evolution equations ˜ 0 = mc ] and using the standard boundary conditions starting at the charm mass [Q0 = Q in Eqs. 06. Finite charm mass effects on the subtracted QS (1) contribution can be inferred by comparing the thick and the thin dotted curves, where the mc → 0 limit has been taken for the latter.
2 have to be doubled [since c(x, µ2 ) = c¯(x, µ2 )]. First we investigate the importance of finite mass corrections to the limit in Eq. 14). (1) SU B In Fig. 20) where ⊗ denotes the usual (massless) convolution. From Fig. 3 it is obvious that the relative difference between ACOT and MS depends crucially on x. It can be large and only slowly convergent to the asymptotic MS limit as can be inferred from Fig. 4. Note that the solid curves in Figs. 4 are extremely sensitive to the precise definition of the subtraction term in Eq.
Also a test of the universality [67] of the charm FF measured in CC DIS and e+ e− annihilation [63] would be an important issue directly related to the factorization theorems [68] of perturbative QCD (pQCD). All εc parameters discussed below refer to a Peterson type [37] functional form given in Eq. 1 CC DIS In CC DIS at fixed target energies one does not expect to gain much insight into the charm production process since charm is dominantly produced in scattering events on strange quarks4 in the nucleon, thereby permitting an experimental determination of the strange quark content of the nucleon [16, 17, 45, 46].