2003/02/11 by G. Kramer, G. Krämer, H. Spiesberger · 2 citations
Mathematics · Physics and Astronomy · #Charm (quantum number) #Charm quark #Cosmology and Gravitation Theories #Factorization #Hadron #High-Energy Particle Collisions Research #Massless particle #Mathematics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Rapidity #hep-ph
paper · pdf · doi:10.1140/epjc/s2003-01186-4
published as Eur.Phys.J.C28:495-513,2003 · 34 pages including postscript figures
arxiv created 2003/02/11 · openalex publication_date 2003/06/01 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have calculated the next-to-leading order cross section for the inclusive production of charm quarks as a function of the transverse momentum pT and the rapidity in two approaches using massive or massless charm quarks. For the single-resolved cross section we have derived the massless limit from the massive theory. We find that this limit differs from the genuine massless version with MS-bar factorization by finite corrections. By adjusting subtraction terms we establish a massive theory with MS-bar subtraction which approaches the massless theory very fast with increasing transverse momentum. With these results and including the equivalent results for the direct cross section obtained previously as well as double-resolved contributions, we calculate the inclusive D*+- cross section in gamma-gamma collisions using realistic evolved non-perturbative fragmentation functions and compare with recent data from the LEP collaborations ALEPH, L3 and OPAL. We find good agreement.