DETERMINATION OF ALPHA(S) FOR B-QUARKS AT THE Z(0) RESONANCE

6533b824fe1ef96bd1280be9

RESEARCH PRODUCT

DETERMINATION OF ALPHA(S) FOR B-QUARKS AT THE Z(0) RESONANCE

P Abreu W Adam T Adye E Agasi Roy Aleksan G D Alekseev A Algeri P Allen S Almehed S J Alvsvaag Ugo Amaldi A Andreazza P Antilogus W D Apel R J Apsimon Y Arnoud B ÅSman J E Augustin A Augustinus Paul Baillon P Bambade F Barão R Barate Guido Barbiellini Dimitri Yuri Bardin G J Barker A Baroncelli O Bärring J A Barrio Walter Bartl M J Bates Marco Battaglia M Baubillier K H Becks C J Beeston M Begalli P Beillière Yu A Belokopytov P Beltran D Benedic Alberto C Benvenuti M Berggren D Bertrand F Bianchi S M Bilenky P Billoir J Bjarne D Bloch S Blyth V Bocci P N Bogolubov T Bolognese M Bonesini W Bonivento P S L Booth G Borisov H Börner C Bosio B Bostjancic S Bosworth O Botner B Bouquet C Bourdarios T J V Bowcock M Bozzo S Braibant P Branchini K D Brand R A Brenner H Briand C Bricman R C A Brown N Brümmer J M Brunet L Bugge T Buran H Burmeister J Buytaert M Caccia M Calvi A J Camacho-rozas R Campion T Camporesi V Canale F Cao F Carena L Carroll Carlo Caso M V Castillo-gimenez A Cattai F R Cavallo L Cerrito V Chabaud A Chan P Charpentier L Chaussard J Chauveau P Checchia G A Chelkov L Chevalier P V Chliapnikov V Chorowicz J T M Chrin P Collins J L Contreras R Contri E Cortina G Cosme F Couchot H B Crawley D J Crennell G Crosetti M Crozon J Cuevas-maestro S Czellar Erik Dahl-jensen B D'almagne M Dam G Damgaard Evelyne Daubie A Daum P D Dauncey Martyn Davenport P David J Davies W Da Silva C Defoix P A Delpierre N Demaria A De Angelis H De Boeck Wim De Boer C De Clercq M D M De Fez Laso N De Groot C De La Vaissière B De Lotto A De Min H Dijkstra Lucia Di Ciaccio F Djama J Dolbeau M Dönszelmann K Doroba M Dracos J Drees M Dris Y Dufour F Dupont D M Edsall L O Eek Paule Anna Mari Eerola R Ehret T J C Ekelöf Gösta Ekspong A Elliot-peisert J P Engel N Ershaidat D Fassouliotis Michael Feindt M Fernández-alonso A Ferrer A Filippas-tassos A Firestone H Föth E Fokitis F Fontanelli K A J Forbes J L Fousset S Francon B J Franek P Frenkiel D E C Fries A G Frodesen R Frühwirth F Fulda-quenzer K Furnival H Fürstenau J A Fuster D Gamba C García J García C Gaspar U Gasparini P Gavillet E N Gazis J P Gerber P Giacomelli R Gokieli B Golob V M Golovatyuk J J Gómez-cadenas Gian P Gopal M Górski Valerio Gracco A Grant F Grard E Graziani G Grosdidier E Gross P Grosse-wiesmann B Grossetête S A Gumenyuk J Guy U Haedinger F Hahn M Hahn S Haider A Hakansson A Hallgren K Hamacher G Hamel De Monchenault W Hao F J Harris V Hedberg T Henkes J J Hernández P Herquet H Herr T L Hessing I Hietanen C O Higgins E Higón Hans Jürgen Hilke S D Hodgson T Hofmokl R Holmes S O Holmgren D J Holthuizen P F Honoré J E Hooper M A Houlden Josef Hrubec K Huet P O Hulth K Hultqvist P Ioannou P S Iversen J N Jackson P Jalocha G Jarlskog P Jarry B Jean-marie E K Johansson D Johnson M Jonker L B Jönsson P Juillot G Kalkanis George Ernest Kalmus F Kapusta M Karlsson E Karvelas S Katsanevas E C Katsoufis R Keränen J Kesteman B A Khomenko N N Khovanskii B J King N J Kjaer H Klein A Klovning P M Kluit A Koch-mehrin J H Köhne B Köne P Kokkinias M Koratzinos A V Korytov V Kostyukhin C Kourkoumelis O Kuznetsov P H Kramer J Królikowski I J Kronkvist U Krüner-marquis W Krupinski K Kulka K L Kurvinen C Lacasta C Lambropoulos J Lamsa L Lanceri V Lapin J P Laugier R Lauhakangas Gerhard Leder F Ledroit R Leitner Y Lemoigne J Lemonne Georg Lenzen V Lepeltier T Lesiak J M Lévy E H Lieb D Liko J Lindgren R Lindner A Lipniacka I Lippi B Lörstad M Lokajícek J G Loken A López-fernandez M A López-aguera M E Los D Loukas J Lozano-bahilo P Lutz L Lyons G Maehlum J Maillard A Maio A Maltezos F Mandl J Marco M Margoni J C Marin A Markou T Maron S Martí L G Mathis F Matorras C Matteuzzi Giorgio Matthiae M Mazzucato M L Mccubbin R Mckay R Mcnulty G Meola C Meroni W T Meyer M Michelotto I Mikulec L Mirabito Winfried A Mitaroff G Mitselmakher U Mjörnmark T Moa R Møller K Mönig M R Monge P Morettini H Müller W J Murray B Muryn Gerald Myatt Francesco Luigi Navarria P Negri R Nicolaidou B S Nielsen B Nijjhar V Nikolaenko P E S Nilsen P Niss A Nomerotski V F Obraztsov A G Olshevskii Risto Orava A P Ostankov K ÖSterberg A Ouraou M Paganoni R Pain H Palka T D Papadopoulou L Pape F Parodi A Passeri M Pegoraro J Pennanen L Peralta H Pernegger Manfred Pernicka A Perrotta C Petridou A Petrolini O Petrovykh F Pierre M Pimenta O Pingot S Plaszczynski O Podobrin M E Pol G Polok P Poropat V Pozdnyakov P Privitera Antonio Pullia D Radojicic S Ragazzi H Rahmani P N Ratoff A L Read P Rebecchi N G Redaelli Meinhard Regler D Reid P B Renton L K Resvanis F Richard M Richardson J Rídky G Rinaudo I Roditi A Romero I Roncagliolo P Ronchese C Rönnqvist E I Rosenberg S Rossi E Rosso Patrick Roudeau T Rovelli W Rückstuhl V Ruhlmann-kleider A Ruiz K Rybicki H Saarikko Yu Sacquin G Sajot J Salt J Sánchez M Sannino S Schael H Schneider B Schulze M A E Schyns G Sciolla F Scuri A M Segar A Seitz R L Sekulin M I Sessa G Sette R Seufert R C Shellard I Siccama P Siegrist S Simonetti F Simonetto A N Sissakian G Skjevling G Smadja N Smirnov O G Smirnova G R Smith R Sosnowski D Souza-santos Tz Spassoff E Spiriti S Squarcia H Stäck C Stanescu Steinar Stapnes G D Stavropoulos F Stichelbaut A Stocchi J Strauss J Straver R Strub B Stugu M Szczekowski M Szeptycka P Szymanski T Tabarelli De Fatis O G Chikilev G E Theodosiou A Tilquin J Timmermans V G Timofeev L G Tkatchev T Todorov D Z Toet O Toker B Tomé E Torassa L Tortora D Treille U Trevisan W Trischuk G Tristram C Troncon A L Tsirou E N Tsyganov Michal Turala M L Turluer T Tuuva I A Tyapkin M Tyndel S Tzamarias S ÜBerschär O Ullaland V Uvarov G Valenti E Vallazza J A Valls Ferrer C Van Der Velde G W Van Apeldoorn P Van Dam M Van Der Heijden W K Van Doninck P Vaz G Vegni L Ventura W A Venus F Verbeure M Verlato L S Vertogradov D Vilanova P Vincent L Vitale E Vlasov A S Vodopyanov M Vollmer M Voutilainen V Vrba H Wahlen C Walck F Waldner M Wayne A Wehr M Weierstall Peter Weilhammer J Werner Alan M Wetherell J H Wickens G R Wilkinson W S C Williams M Winter M Witek G Wormser K Woschnagg N Yamdagni P Yepes A Zaitsev A Zalewska-bak Piotr Zalewski D Zavrtanik E Zevgolatakos G Zhang N I Zimin M Zito R Zuberi R Zukanovich-funchal G Zumerle J Zúñiga

subject

Quark CHARMED MESONS Nuclear and High Energy Physics Particle physics HEAVY FLAVOR PRODUCTION Electron–positron annihilation High Energy Physics::Lattice FRAGMENTATION FUNCTIONS Flavour Hadron 01 natural sciences Bottom quark Nuclear physics MONTE-CARLO 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physics Nuclear Experiment Z DECAYS Physics Coupling constant Quantum chromodynamics 010308 nuclear & particles physics High Energy Physics::Phenomenology JET PRODUCTION-RATES QCD STRING MODEL High Energy Physics::Experiment Física nuclear HEAVY FLAVOR PRODUCTION; JET PRODUCTION-RATES; E+ E ANNIHILATION; Z0 RESONANCE; FRAGMENTATION FUNCTIONS; CHARMED MESONS; STRING MODEL; MONTE-CARLO; Z DECAYS; QCD E+ E ANNIHILATION Z0 RESONANCE Particle Physics - Experiment Lepton

description

The strong coupling constant for b quarks has been determined, and its flavour independence, as predicted by QCD, investigated. The analysis involved events with lepton candidates selected from approximately 356 000 hadronic decays of the Z0, collected by the DELPHI detector at LEP in 1990 and 199 1. A method based on a direct comparison of the three-jet fraction in a b enriched sample, selected by requiring leptons with large momenta and transverse momenta, to that of the entire hadronic sample, illustrated the significant effect of the b quark mass on the multi-jet cross section, and verified the flavour independence of the strong coupling constant to an accuracy of +/- 6%. A second procedure based on a fit to the momentum and transverse momentum spectra of the lepton candidates in both two-jet and three (or more)-jet event samples simultaneously determined the b content in each, and, using second order QCD calculations, gave an absolute measurement of alpha(s) for b quarks of 0. 1 18 +/- 0.004 (stat.) +/- 0.003 (syst.) +/- 0.008 (scale). A comparison with a, for all quark flavours, as measured from the three-jet fraction in all hadronic events, further allowed the coupling strength for b quarks to be expressed in terms relative to that for udsc quarks, thereby cancelling certain common systematic uncertainties, and yielded alpha(s)b/alpha(s)udsc = 1.00 +/- 0.04 (stat.) +/- 0.03 (syst.).

year	journal	country	edition	language
1993-01-01

10.1016/0370-2693(93)90213-2 http://hdl.handle.net/11567/299615