Measurement Of Alpha(S) From Jet Rates In Deep-Inelastic Scattering At Hera

M. Derrick,D. Krakauer,S. Magill,D. Mikunas,B. Musgrave,J. Repond,R. Stanek,R.L. Talaga,H. Zhang,R. Ayad,G. Bari,M. Basile, L. Bellagamba, D. Boscherini,A. Bruni, G. Bruni,P. Bruni,G. Cara Romeo,G. Castellini,M. Chiarini, L. Cifarelli,F. Cindolo,A. Contin,M. Corradi, I. Gialas,P. Giusti,G. Iacobucci,G. Laurenti,G. Levi, A. Margotti,T. Massam,R. Nania, C. Nemoz, F. Palmonari, A. Polini,G. Sartorelli,R. Timellini,Y. Zamora Garcia, A. Zichichi,A. Bargende,A. Bornheim,J. Crittenden, K. Desch,B. Diekmann,T. Doeker, M. Eckert,L. Feld,A. Frey,M. Geerts, M. Grothe,H. Hartmann,K. Heinloth,E. Hilger,H.-P. Jakob,U.F. Katz,S. Mengel, J. Mollen,E. Paul,M. Pfeiffer,Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer,S. Campbell-Robson,A. Cassidy,W.N. Cottingham,N. Dyce,B. Foster,S. George,M.E. Hayes,G.P. Heath,H.F. Heath,C.J.S. Morgado,J.A. O'Mara,D. Piccioni,D.G. Roff,R.J. Tapper,R. Yoshida,R.R. Rau,M. Arneodo,M. Capua, A. Garfagnini,L. Iannotti,M. Schioppa,G. Susinno,A. Bernstein,A. Caldwell,N. 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PHYSICS LETTERS B（1995）

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摘要

Jet production in deep inelastic scattering for 120 < Q(2) < 3600 GeV2 has been studied using data from an integrated luminosity of 3.2 pb(-1) collected with the ZEUS detector at HERA. Jets are identified with the JADE algorithm. A cut on the angular distribution of parton emission in the gamma(8)-parton centre-of-mass system minimises the experimental and theoretical uncertainties in the determination of the jet rates. The jet rates, when compared to O(alpha(s)(2)) perturbative QCD calculations, allow a precise determination of alpha(s)(Q) in three Q(2)-intervals. The values are consistent with a running of alpha(s)(Q), as expected from QCD. Extrapolating to Q = M(Z0) yields alpha(s)(M(Z0)) = 0.117 +/- 0.005 (stat)(-0.005)(+0.004) (syst(exp)) +/- 0.007 (syst(theory)).

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calorimeter,fragmentation,monte carlo,zeus

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