Measurement of inclusive D * 1 production in two-photon collisions at LEP L 3 Collaboration

Inclusive production of D * ± mesons in two-photon collisions was measured by the L3 experiment at LEP. The data were collected at a centre-of-mass energy Js = 189 GeV with an integrated luminosity of 176.4 pb 1 2345678. Differential cross sections of the process ee ^ee l)‘ X are determined as functions of the transverse momentum and pseudorapidity of the D* ± mesons in the kinematic region 1 GeV < p'/ < 5GeV and |t|d | < 1.4. The cross section integrated over this phase space domain is measured to be 132 + 22(stat.) + 26(syst.)pb. The differential cross sections are compared with next-to-leading order perturbative QCD calculations. © 1999 Published by Elsevier Science B.V. All rights reserved. 1 Also supported by CONICET and Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina. 2 Also supported by Panjab University, Chandigarh-160014, India. 3 Deceased. 4 Also supported by the Hungarian OTKA fund under contract numbers T22238 and T026178. 5 Supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie. 6 Supported by the National Natural Science Foundation of China. 7 Supported by the Hungarian OTKA fund under contract num­ bers T019181, F023259 and T024011. 8 Supported also by the Comisión Interministerial de Ciencia y Tecnología.