Measurement of the strong coupling constant alfa_s from global event-shape variables of hadronic Z decays

6533b871fe1ef96bd12d0fa1

RESEARCH PRODUCT

Measurement of the strong coupling constant alfa_s from global event-shape variables of hadronic Z decays

D. Decampo 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 G. Petersen 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 S.j. Patton 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 B.s. Rowlingson T. Sloan S.w. Snow 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 G. Hauser 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.a. Ciocci 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 A. Venturi J. Walsh J.m. Carter M.g. Green P.v. March T. Medcalf M.r. Saich J.a. Strong R.m. Thomas 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.l. Harton J. Hilgart J.e. Jacobsen R.c. Jared R.p. Johnson B.w. Leclaire Y.b. Pan T. Parker J.r. Pater Y. Saadi V. Sharma J.a. Wear F.v. Weber Sau Lan Wu G. Zobernig

subject

Quantum chromodynamics Physics Nuclear and High Energy Physics Particle physics Electron–positron annihilation Hadron Measure (mathematics)Hadronization law.invention Nuclear physics Renormalization law High Energy Physics::Experiment Collider Constant (mathematics)Particle Physics - Experiment

description

Abstract An analysis of global event-shape variables has been carried out for the reaction e+e−→Z0→hadrons to measure the strong coupling constant αs. This study is based on 52 720 hadronic events obtained in 1989/90 with the ALEPH detector at the LEP collider at energies near the peak of the Z-resonance. In order to determine αs, second order QCD predictions modified by effects of perturbative higher orders and hadronization were fitted to the experimental distributions of event-shape variables. From a detailed analysis of the theoretical uncertainties we find that this approach is best justified for the differential two-jet rate, from which we obtain αs(MZ2) = 0.121 ± 0.002(stat.)±0.003(sys.)±0.007(theor.) using a renormalization scale ω = 1 2 M Z . The dependence of αs(MZ2) on ω is parameterized. For scales mb

year	journal	country	edition	language
1991-01-01

10.1016/0370-2693(91)90278-x http://hdl.handle.net/11568/828845