Determination of $\alpha_s$ from Hadronic Event Shapes in $e^+ e^-$ Annihilation at $192 \le \sqrt{s} \le 208$ GeV

• Published in: Physics letters. B 2002-02, Vol.536, p.217-228
• Main Authors: Achard, P., Adriani, O., Aguilar-Benitez, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alviggi, M G., Anderhub, H., Andreev, V P., Anselmo, F., Arefev, A., Azemoon, T., Aziz, T., Bagnaia, P., Bajo, A., Baksay, G., Baksay, L., Baldew, S V., Banerjee, S., Banerjee, Sw, Barczyk, A., Barillere, R., Bartalini, P., Basile, M., Batalova, N., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Bellucci, L., Berbeco, R., Berdugo, J., Berges, P., Bertucci, B., Betev, B L., Biasini, M., Biglietti, M., Biland, A., Blaising, J J., Blyth, S C., Bobbink, G J., Boehm, A., Boldizsar, L., Borgia, B., Bottai, S., Bourilkov, D., Bourquin, M., Braccini, S., Branson, J G., Brochu, F., Burger, J D., Burger, W J., Cai, X D., Capell, M., Cara Romeo, G., Carlino, G., Cartacci, A., Casaus, J., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Chamizo-Llatas, M., Chang, y H., Chemarin, M., Chen, A., Chen, G., Chen, G M., Chen, H F., Chen, H S., Chiefari, G., Cifarelli, L., Cindolo, F., Clare, I., Clare, R., Coignet, G., Colino, N., Costantini, S., de La Cruz, B., Cucciarelli, S., van Dalen, J A., de Asmundis, R., Deglon, P., Debreczeni, J., Degre, A., Deiters, K., Della Volpe, D., Delmeire, E., Denes, P., de Notaristefani, F., de Salvo, A., Diemoz, M., Dierckxsens, M., Dionisi, C., Dittmar, M., Doria, A., Dova, M T., Duchesneau, D.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693
• DOI: 10.1016/S0370-2693(02)01814-2

Results are presented from a study of the structure of high energy hadronic events recorded by the L3 detector at sqrt(s) 192 GeV. The distributions of several event shape variables are compared to resummed O(alphaS^2) QCD calculations. We determine the strong coupling constant at three average centre-of-mass energies: 194.4, 200.2 and 206.2 GeV. These measurements, combined with previous L3 measurements at lower energies demonstrate the running of alphaS as expected in QCD and yield alphaS(mZ) = 0.1227 +- 0.0012 +- 0.0058, where the first uncertainty is experimental and the second is theoretical.