Using 106 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant αs is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust, C-parameter and oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum scaled invariant mass cut, Ycut, before these variables are computed. The combined result from all shape variables of pre-clustered events is αs(MZ2 = 0.117±0.005 for a renormalization scale . For μ values between MZ and the b-quark mass, the result changes by −0.009+0.006.
Measurement of αs from the structure of particle clusters produced in hadronic Z decays / D. Decamp;B. Deschizeaux;C. Goy;J.-P. Lees;M.-N. Minard;R. Alemany;J.M. Crespo;M. Delfino;E. Fernandez;V. Gaitan;Ll. Garrido;P. Mato;R. Miquel;Ll.M. Mir;S. Orteu;A. Pacheco;J.A. Perlas;E. Tubau;M.G. Catanesi;D. Creanza;M. de Palma;A. Farilla;G. Iaselli;G. Maggi;M. Maggi;S. Natali;S. Nuzzo;M. Quattromini;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;Y. Gao;H. Hu;D. Huang;X. Huang;J. Lin;J. Lou;C. Qiao;T. Ruan;T. Wang;Y. Xie;D. Xu;R. Xu;J. Zhang;W. Zhao;H. Albrecht;W.B. Atwood;F. Bird;E. Blucher;G. Bonvicini;F. Bossi;D. Brown;T.H. Burnett;H. Drevermann;F. Dydak;R.W. Forty;C. Grab;R. Hagelberg;S. Haywood;B. Jost;M. Kasemann;G. Kellner;J. Knobloch;A. Lacourt;I. Lehraus;T. Lohse;D. Lüke;A. Marchioro;M. Martinez;J. May;S. Menary;A. Minten;A. Miotto;J. Nash;P. Palazzi;F. Ranjard;G. Redlinger;A. Roth;J. Rothberg;H. Rotscheidt;W. von Rüden;R. St.Denis;D. Schlatter;M. Takashima;M. Talby;W. Tejessy;H. Wachsmuth;S. Wasserbaech;S. Wheeler;W. Wiedenmann;W. Witzeling;J. Wotschack;Z. Ajaltouni;M. Bardadin-Otwinowska;A. Falvard;R. El Fellous;P. Gay;J. Harvey;P. Henrard;J. Jousset;B. Michel;J.-C. Montret;D. Pallin;P. Perret;J. Proriol;F. Prulhière;G. Stimpfl;J.D. Hansen;J.R. Hansen;P.H. Hansen;R. Møllerud;E.R. Nielsen;B.S. Nilsson;I. Efthymiopoulos;E. Simopoulou;A. Vayaki;J. Badier;A. Blondel;G. Bonneaud;J. Bourotte;F. Braems;J.C. Brient;G. Fouque;A. Gamess;R. Guirlet;A. Rosowsky;A. Rougé;M. Rumpf;R. Tanaka;H. Videau;D.J. Candlin;E. Veitch;G. Parrini;M. Corden;C. Georgiopoulos;M. Ikeda;J. Lannutti;D. Levinthal;M. Mermikides;L. Sawyer;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;P. Campana;G. Capon;V. Chiarella;B. D'Ettorre-Piazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Massimo-Brancaccio;F. Murtas;G.P. Murtas;G. Nicoletti;L. Passalacqua;M. Pepe-Altarelli;P. Picchi;P. Zografou;B. Altoon;O. Boyle;A.W. Halley;I. ten Have;J.L. Hearns;J.G. Lynch;W.T. Morton;C. Raine;J.M. Scarr;K. Smith;A.S. Thompson;R.M. Turnbull;B. Brandl;O. Braun;R. Geiges;C. Geweniger;P. Hanke;V. Hepp;E.E. Kluge;Y. Maumary;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;A.T. Belk;R. Beuselinck;D.M. Binnie;W. Cameron;M. Cattaneo;P.J. Dornan;S. Dugeay;A.M. Greene;J.F. Hassard;N.M. Lieske;S.J. Patton;D.G. Payne;M.J. Phillips;J.K. Sedgbeer;G. Taylor;I.R. Tomalin;A.G. Wright;P. Girtler;D. Kuhn;G. Rudolph;C.K. Bowdery;T.J. Brodbeck;A.J. Finch;F. Foster;G. Hughes;N.R. Keemer;M. Nuttall;A. Patel;B.S. Rowlingson;T. Sloan;S.W. Snow;E.P. Whelan;T. Barczewski;L.A.T. Bauerdick;K. Kleinknecht;B. Renk;S. Roehn;H.-G. Sander;M. Schmelling;H. Schmidt;F. Steeg;J.-P. Albanese;J.-J. Aubert;C. Benchouk;V. Bernard;A. Bonissent;D. Courvoisier;F. Etienne;S. Papalexiou;P. Payre;B. Pietrzyk;Z. Qian;W. Blum;P. Cattaneo;G. Cowan;B. Dehning;H. Dietl;M. Fernandez-Bosman;T. Hansl-Kozanecka;A. Jahn;W. Kozanecki;E. Lange;G. Lütjens;G. Lutz;W. Männer;H.-G. Moser;Y. Pan;R. Richter;J. Schröder;A.S. Schwarz;R. Settles;U. Stierlin;J. Thomas;G. Wolf;V. Bertin;G. de Bouard;J. Boucrot;O. Callot;X. Chen;A. Cordier;M. Davier;G. Ganis;J.-F. Grivaz;Ph. Heusse;P. Janot;V. Journé;D.W. Kim;J. Lefrançois;A.-M. Lutz;J.-J. Veillet;I. Videau;Z. Zhang;F. Zomer;S.R. Amendolia;G. Bagliesi;G. Batignani;L. Bosisio;U. Bottigli;C. Bradaschia;M. Carpinelli;M.A. Ciocci;R. Dell'Orso;I. Ferrante;F. Fidecaro;L. Foà;E. Focardi;F. Forti;A. Giassi;M.A. Giorgi;F. Ligabue;A. Lusiani;E.B. Mannelli;P.S. Marrocchesi;A. Messineo;L. Moneta;F. Palla;G. Sanguinetti;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;C. Vannini-Castaldi;A. Venturi;P.G. Verdini;J. Walsh;J.M. Carter;M.G. Green;P.V. March;T. Medcalf;I.S. Quazi;M.R. Saich;J.A. Strong;R.M. Thomas;L.R. West;T. Wildish;D.R. Botterill;R.W. Clifft;T.R. Edgecock;M. Edwards;S.M. Fisher;T.J. Jones;P.R. Norton;D.P. Salmon;J.C. Thompson;B. Bloch-Devaux;P. Colas;C. Klopfenstein;E. Lançon;E. Locci;S. Loucatos;E. Monnier;P. Perez;F. Perrier;J. Rander;J.-F. Renardy;A. Roussarie;J.-P. Schuller;J. Schwindling;J.G. Ashman;C.N. Booth;C. Buttar;R. Carney;S. Cartwright;F. Combley;M. Dinsdale;M. Dogru;F. Hatfield;J. Martin;D. Parker;P. Reeves;L.F. Thompson;S. Brandt;H. Burkhardt;C. Grupen;H. Meinhard;L. Mirabito;E. Neugebauer;U. Schäfer;H. Seywerd;G. Apollinari;G. Giannini;B. Gobbo;F. Liello;L. Rolandi;U. Stiegler;L. Bellantoni;J.F. Boudreau;D. Cinabro;J.S. Conway;D.F. Cowen;A.J. DeWeerd;Z. Feng;D.P.S. Ferguson;Y.S. Gao;J. Grahl;J.L. Harton;J. Hilgart;J.E. Jacobsen;R.C. Jared;R.P. Johnson;B.W. LeClaire;Y.B. Pan;J.R. Pater;Y. Saadi;V. Sharma;A.M. Walsh;J.A. Wear;F.V. Weber;M.H. Whitney;Sau Lan Wu Lan Wu;Z.L. Zhou;G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 257:(1991), pp. 479-491. [10.1016/0370-2693(91)91926-M]
Measurement of αs from the structure of particle clusters produced in hadronic Z decays
FOCARDI, ETTORE;
1991
Abstract
Using 106 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant αs is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust, C-parameter and oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum scaled invariant mass cut, Ycut, before these variables are computed. The combined result from all shape variables of pre-clustered events is αs(MZ2 = 0.117±0.005 for a renormalization scale . For μ values between MZ and the b-quark mass, the result changes by −0.009+0.006.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.