Measurement of as from Hadronic Event Observable at the 2° Resonance

The strong coupling a, has been measured using hadronic decays of 2° bosons co~ected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O(a~ ), and including resummed analytic formulae based on the leading and next-toleading logarithm approximation. We studied event shapes, jet rates, particle correlations, and energy fraction and checked the consistency between a, extracted from these different measures. Combining au results we obtain a,(M~o) = 0.120 + 0.003 (exp.) + 0.009 (their.), where the dominant uncertainty in a, is from uncalculated higher order contributions. Presented at the 27th InternationalConference on High Energy Physics (ICHEP), Glasgow, Scotland, July 20-27,1994 * Work mpported by the Deputment of Ener~ mntr=~ DBFG0291ER40676 (BU), DBFGO% 92ER40701(~T), DBFGO%91ER40618 (UCSB), D~FGO%92ER40689 (UCSC), DBFGO&93ER40788 (CSU), DEFGO>91ER40672 (-rdo), DBFG0291ER40677 @&), DBACO*76SFOO098 (LBL), D&FG0292ER40715 @_wt@), D&ACO%76ER03069 (Mm), D&F-85ER40224 (O~Om), D&ACO&76SFOMlS (SLAC~ DBFG~91ER40627 (%~), DEACOZ76ERO0881 (Wtitin), DEFG0292ER40704 @de); National -= Fondation grw~ PHY-91-13428 (UCSC), PHY-8$ 21320(~-ti), PHY-9>04239(-~~ti), PHY-8&17930 (Rutgem), PHY-8&19316 (Vuderbiit), PHY-9%03212 (wan); Ue UK -a ~d ~eeri~ ~ Co-d (Bred ~d RAL); the btituto Ntin* di F* Nnbe d Italy (~q Ferruq Rxati, ~ PAOW Perugia); md the JaP-US Cooper=ti= ReeeuA Projd m High Energy Phyrnu (Nwoya, Tohoku).