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T: Teilchenphysik

T 508: QCD III

T 508.8: Talk

Wednesday, March 12, 2003, 18:10–18:25, SFO11

Fragmentation functions using e⁺e⁻ data from PETRA and LEP — •Mona Blumenstengel¹, Otmar Biebel², Stefan Kluth¹, Pedro Movilla Fernandez¹, and Christoph Pahl¹ — ¹Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München — ²Ludwigs-Maximilians-Universität Mnchen, Sektion Physik, Am Coulombwall 1, 85748 Garching

We investigate fragmentation of charged particles in e⁺e⁻ annihilation at 22, 35, and 44 GeV in terms of their polar angle and momentum distributions. From the angular distribution the ratio of longitudinal to total hadronic cross-section was determined at an average energy scale of 36.6 GeV to be σ_L/σ_tot=0.076 ± 0.013. At next-to-leading order this yields α_S(36.6GeV) = 0.150 ± 0.025. The ξ≡ ln(1/x) distributions were used in conjunction with OPAL data from 91-208 GeV to study the scale dependence of the maximum position, ξ₀. We studied flavour dependence of ξ₀ using direct flavour dependent measurements of ξ₀ at 91 GeV by OPAL.