Measurement of the quark and gluon fragmentation functions in Z $^0$ hadronic decays

P. Abreu et al.
1999 European Physical Journal C: Particles and Fields  
The transverse, longitudinal and asymmetric components of the fragmentation function are measured from the inclusive c harged particles produced in e + e collisions at LEP. As in deep inelastic scattering, these data are important for tests of QCD. The transverse T and longitudinal L components of the total hadronic cross section tot are evaluated from the measured fragmentation functions. They are found to be T = tot = 0 : 949 0:001(stat:) 0:007(syst:) and L = tot = 0 : 051 0:001(stat:)
more » ... yst:) respectively. The strong coupling constant is calculated from L = tot in next-to-leading order of perturbative QCD, giving s (M Z ) = 0 : 120 0:002(stat:) 0:013(syst:) 0:007(scale) : Including non-perturbative p o w er corrections leads to s (M Z ) = 0 : 101 0:002(stat:) 0:013(syst:) 0:007(scale) : The measured transverse and longitudinal components of the fragmentation function are used to estimate the mean charged multiplicity, hn ch i = 2 1 : 21 0:01(stat:) 0:20(syst:) The fragmentation functions and multiplicities i n b b and light quark events are compared. The measured transverse and longitudinal components of the fragmentation function allow the gluon fragmentation function to be evaluated.
doi:10.1007/s100529801013 fatcat:xqxgz7yeibgv3ijpkuh6dcwm5m