Determination of alpha(s) using energy-energy correlation asymmetry and jet mass difference at MARK II/SLC.

The determination of the strong coupling constant $\alpha\sb s$, using Energy-Energy Correlation Asymmetry and jet mass difference with Mark II data at SLC (91 GeV) is presented. In Energy-Energy Correlation Asymmetry (EECA), we used the same systematic procedure used to determine $\alpha\sb s$ with MARK II data at PEP (29 GeV). The $\chi\sp2$ fit suggests that $\alpha\sb s$ = 0.119 $\pm$ 0.007(stat.) $\pm$ 0.007(syst.). In addition, we used the EECA method to determine the QCD scale parameter $\Lambda\sb{LLA}$. The $\chi\sp2$ fit suggests that $\Lambda\sb{LLA}$ = 420 $\pm$ 90(stat.) MeV. In the jet mass difference method, the determination of $\alpha\sb s$ is based on QCD calculations up to 2nd order. We showed that in this method we are able to reproduce the value of $\alpha\sb s$ from a Monte Carlo sample to a very high accuracy. The result with this method is $\alpha\sb s$ = 0.134 $\pm$ 0.085(stat.) $\pm$ 0.004(syst.). The two values of $\alpha\sb s$ presented in this work are in agreement within the error bars and in a good agreement with recent results of $\alpha\sb s$ published from other $e\sp+e\sp-$ experiments.PhDPhysicsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/105354/1/9123993.pdfDescription of 9123993.pdf : Restricted to UM users only