Measurement of the strong coupling constant using τ decays

Measurement of the strong coupling constant using τ decays

The strong coupling constant is determined from the leptonic branching ratios, the lifetime, and the invariant mass distribution of the hadronic final state of the τ lepton, using data accumulated at LEP with the ALEPH detector. The strong coupling constant measurement, α s ( m τ 2) = 0.330±0.046, e...

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Veröffentlicht in:Physics letters. B 1993-06, Vol.307 (1), p.209-220
Hauptverfasser: Buskulic, D., Crespo, J.M., de Palma, M., Maggi, M., Natali, S., Chai, Y., Xu, D., Xu, R., Bauerdick, L.A.T., Casper, D., Haywood, S., Knobloch, J., Lehraus, I., Lusiani, A., Miquel, R., Ranjard, F., Rothberg, J., Witzeling, W., Bardadin-Otwinowska, M., Falvard, A., Gay, P., Guicheney, C., Montret, J.-C., Fearnley, T., Hansen, J.R., Nilsson, B.S., Efthymiopoulos, I., Rumpf, M., Veitch, E., Corden, M., Ikeda, M., Bologna, G., Capon, G., Murtas, F., Passalacqua, L., ten Have, I., Raine, C., Hepp, V., Wunsch, M., Belk, A.T., Beuselinck, R., Greene, A.M., Nash, J., Kneringer, E., Renk, B., Schmidt, H., Benchouk, C., Coyle, P., Etienne, F., Papalexiou, S., Roos, L., Adlung, S., Brown, D., Dydak, F., Frank, M., Richter, R., Rotscheidt, H., Settles, R., Seywerd, H., Stiegler, U., Denis, R.St, Callot, O., Lefrançois, J., Lutz, A.-M., Schune, M.-H., Batignani, G., Calderini, G., Ciocci, M.A., Giorgi, M.A., Mannelli, E.B., Messineo, A., Sanguinetti, G., Green, M.G., Mir, Ll.M., Medcalf, T., Botterill, D.R., Clifft, R.W., Edwards, M., Fisher, S.M., Jones, T.J., Norton, P.R., Duarte, H., Kozanecki, W., Locci, E., Rosowsky, A., Roussarie, A., Schuller, J.-P., Si Mohand, D., Vallage, B., Litke, A.M., Taylor, G., Booth, C.N., Carney, R.E., Böhrer, A., Schäfer, U., Ragusa, F., Conway, J.S., Feng, Z., Grahl, J., Shi, Z.H.
Format: Artikel
Sprache:eng
Schlagworte:
Exact sciences and technology
High Energy Physics - Experiment
Leptons
Physics
Properties of specific particles
The physics of elementary particles and fields
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Zusammenfassung:The strong coupling constant is determined from the leptonic branching ratios, the lifetime, and the invariant mass distribution of the hadronic final state of the τ lepton, using data accumulated at LEP with the ALEPH detector. The strong coupling constant measurement, α s ( m τ 2) = 0.330±0.046, evolved to the Z mass yields α s ( M Z 2) = 0.188±0.005. The error includes experimental and theoretical uncertainties, the latter evaluated in the framework of the Shifman, Vainshtein and Zakharov (SVZ) approach. The method allows the non-perturbative contribution to the hadronic decay rate to be determined to be 0.3±0.5%.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(93)90212-Z