Inclusive photoproduction of $D^*$ mesons with massive charm quarks

Kramer, G.; Spiesberger, H.

doi:10.1140/epjc/s2004-02054-5

Report/Journal Article

PUBDB-2017-05082

Inclusive photoproduction of $D^*$ mesons with massive charm quarks

Kramer, G.Extern* ; Spiesberger, H.

2004
Springer Berlin

The European physical journal / C 38(3), 309 - 318 (2004) [10.1140/epjc/s2004-02054-5]

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Please use a persistent id in citations: doi:10.1140/epjc/s2004-02054-5

Report No.: DESY-04-196; MZ-TH-03-18; hep-ph/0311062

Abstract: We have calculated the next-to-leading order cross sections for the inclusive production of D* mesons in gamma-p collisions at HERA in two approaches using massive or massless charm quarks. The usual massive theory for the direct cross section with charm quarks only in the final state was transformed into a massive theory with MS-bar subtraction by subtracting the mass divergent and additional finite terms calculated earlier in connection with the process gamma+gamma -> D*+X. This theory approaches the massless theory with increasing transverse momentum. The difference between the massive and the massless approach with MS-bar subtraction is studied in detail in those kinematic regions relevant for comparison with experimental data. With these results and including the resolved cross section which is dominated by the part originating from the charm in the photon, we compute the fully inclusive D* cross section and compare it with preliminary data from the ZEUS collaboration at HERA. We find on average good agreement.

Keyword(s): photon p: inclusive reaction ; D*(2010): photoproduction ; quark: charm ; quark: massive ; quark: massless ; photon: resolved ; transverse momentum: spectrum ; channel cross section: ratio ; rapidity spectrum ; differential cross section ; numerical calculations ; interpretation of experiments: ZEUS