Measurement of the inclusive D∗± production in γγ collisions at LEP

✍ Scribed by J. Heß; A. Ngac

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 648 KB
• Volume: 126
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)02326-0

✦ Synopsis

The inclusive production of D** mesons in two-photon collisions is measured with the ALEPH detector at e+e-centre-of-mass energies from 183 GeV to 209 GeV. A total of 360 i 27 D*' meson events are observed from an integrated luminosity of 699 pb-'. Cont$>tions from direct and single-resolved processes are separated using the ratio of the transverse momentum p, of the D** to the visible invariant mass Wyis of the event. Differential cross sections of D** production as functions of pf** and the pseudorapidity (qD** ( are measured in the range 2GeV/c < pt *** < 12 GeV/c and IqD**/ < 1.5. They are compared to next-to-leading order (NLO) perturbative QCD calculations. The extrapolation of the integrated visible D** cross section to the total charm cross section, based on the Pythia Monte Carlo program, yields u(e+e--+ efe-cF)(fi))=leiGev = 731 i 74,tat k 47,,,t + 157,,t, pb.