Fragmentation functions using e+e- data from PETRA and LEP

Abstract

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 ${\sigma }_L/{\sigma }_{tot}=0.076\pm 0.013$. At next-to-leading order this yields ${\alpha }_S(36.6GeV)=0.150\pm 0.025$. The $\xi =\ln (1/x)$ distributions were used in conjunction with OPAL data from 91-208 GeV to study the scale dependence of the maximum position, ${\xi }_0$. We studied flavour dependence of ${\xi }_0$ as a possible explanation of this problem, using direct flavour dependent measurements of ${\xi }_0$ at 91 GeV by OPAL.

4 pages, 4 figures. Talk given by M. Blumenstengel at QCD 02, Montpellier, France, July 2002

References in corpus (2)

• Determination of the QCD Coupling ${\alpha }_s$
• Measurement of the longitudinal and transverse cross-section in e^+e^- annihilation at sqrt(s)=35-44 GeV