Search for a fourth generation b’-quark at LEP-II at $\sqrt{s}=\,$196–209 GeV

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type 29 Mar 2007Embargo end date: 01 Jan 2007 France, France, France, United Kingdom, Italy, France, Greece, United Kingdom, France, France, United Kingdom English Publisher:Springer Science and Business Media LLCJournal:The European Physical Journal C, volume 50, pages 507-518 (issn: 1434-6044, eissn: 1434-6052,

Copyright policy )Funded by:FCT | LA 1

Authors: J. Abdallah; P. Abreu; W. Adam; P. Adzic; T. Albrecht; R. Alemany Fernandez; T. Allmendinger; +193 Authors

J. Abdallah; P. Abreu; W. Adam; P. Adzic; T. Albrecht; R. Alemany Fernandez; T. Allmendinger; P. P. Allport; U. Amaldi; N. Amapane; S. Amato; E. Anashkin; A. Andreazza; S. Andringa; N. Anjos; P. Antilogus; W. Apel; Y. Arnoud; S. Ask; B. Asman; J. E. Augustin; A. Augustinus; P. Baillon; A. Ballestrero; P. Bambade; R. Barbier; D. Bardin; G. J. Barker; A. Baroncelli; M. Battaglia; M. Baubillier; K. Becks; M. Begalli; A. Behrmann; E. Ben Haim; N. Benekos; A. Benvenuti; C. Berat; M. Berggren; L. Berntzon; D. Bertrand; M. Besancon; N. Besson; D. Bloch; M. Blom; M. Bluj; M. Bonesini; M. Boonekamp; P. S. L.; G. Borisov; O. Botner; B. Bouquet; T. J. V.; I. Boyko; M. Bracko; R. Brenner; E. Brodet; P. Bruckman; J. M. Brunet; B. Buschbeck; P. Buschmann; M. Calvi; T. Camporesi; V. Canale; F. Carena; N. Castro; F. Cavallo; M. Chapkin; P. Charpentier; P. Checchia; R. Chierici; P. Chliapnikov; J. Chudoba; S. U. Chung; K. Cieslik; P. Collins; R. Contri; G. Cosme; F. Cossutti; M. J. Costa; D. Crennell; J. Cuevas; J. D'Hondt; J. Dalmau; T. D. Silva; W. D. Silva; G. D. Ricca; A. D. Angelis; W. D. Boer; C. D. Clercq; B. D. Lotto; N. D. Maria; A. D. Min; L. d. Paula; L. D. Ciaccio; A. D. Simone; K. Doroba; J. Drees; G. Eigen; T. Ekelof; M. Ellert; M. Elsing; M. C. Espirito; G. Fanourakis; D. Fassouliotis; M. Feindt; J. Fernandez; A. Ferrer; F. Ferro; U. Flagmeyer; H. Foeth; E. Fokitis; F. Fulda Quenzer; J. Fuster; M. Gandelman; C. Garcia; P. Gavillet; E. Gazis; R. Gokieli; B. Golob; G. Gomez Ceballos; P. Goncalves; E. Graziani; G. Grosdidier; K. Grzelak; J. Guy; C. Haag; A. Hallgren; K. Hamacher; K. Hamilton; S. Haug; F. Hauler; V. Hedberg; M. Hennecke; H. Herr; J. Hoffman; S. Holmgren; P. J. Holt; M. A. Houlden; J. N. Jackson; G. Jarlskog; P. Jarry; D. Jeans; E. K. Johansson; P. D. Johansson; P. Jonsson; C. Joram; L. Jungermann; F. Kapusta; S. Katsanevas; E. Katsoufis; G. Kernel; B. P. Kersevan; U. Kerzel; B. T. King; N. J. Kjaer; P. Kluit; P. Kokkinias; C. Kourkoumelis; O. Kouznetsov; Z. Krumstein; M. Kucharczyk; J. Lamsa; G. Leder; F. Ledroit; L. Leinonen; R. Leitner; J. Lemonne; V. Lepeltier; T. Lesiak; W. Liebig; D. Liko; A. Lipniacka; J. H. Lopes; J. M. Lopez; D. Loukas; P. Lutz; L. Lyons; J. MacNaughton; A. Malek; S. Maltezos; F. Mandl; J. Marco; R. Marco; B. Marechal; M. Margoni; J. Marin; C. Mariotti; A. Markou; C. Martinez Rivero; J. Masik; N. Mastroyiannopoulos; F. Matorras; C. Matteuzzi; F. Mazzucato; M. Mazzucato; R. M. Nulty; C. Meroni; E. Migliore; W. Mitaroff;

doi: 10.1140/epjc/s10052-007-0273-z , 10.48550/arxiv.0704.0594

arXiv: 0704.0594

handle: 10261/8536 , 11368/1720462 , 2434/38904 , 10281/155935 , 11577/2482130 , 11390/884218 , 11567/299776 , 2318/38836

Search for a fourth generation b’-quark at LEP-II at $\sqrt{s}=\,$196–209 GeV

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Abstract

A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb^{-1}. No evidence for a signal was found. Upper limits on BR(b' -> bZ) and BR(b' -> cW) were obtained for b' masses ranging from 96 to 103 GeV/c^2. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of R_{CKM}=|V_{cb'}/V_{tb'}V_{tb}|, where V_{cb'}, V_{tb'} and V_{tb} are elements of the extended CKM matrix.

26 pages, 12 figures, Accepted by Eur. Phys. J. C

Countries

France, France, France, United Kingdom, Italy, France, Greece, United Kingdom, France, France, United Kingdom

Related Organizations

University of Turin
Italy
University of Helsinki
Finland
National and Kapodistrian University of Athens
Greece
University of Lyon System
France
Karlsruhe Institute of Technology
Germany

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Keywords

Energy, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], E(+)e(-) Colliders, Annihilation, FOS: Physical sciences, PHYSICS EVENT GENERATION; NEUTRAL-CURRENT DECAYS; CHARGE -1/3 QUARK; MONTE-CARLO; E(+)E(-) COLLIDERS; DELPHI; ENERGY; Z0; ANNIHILATION; COLLISIONS, 530, LARGE ELECTRON POSITRON COLLIDER, Delphi, High Energy Physics - Experiment, Charge -1/3 Quark, High Energy Physics - Experiment (hep-ex), Neutral-current Decays, PARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHI, Monte-carlo, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PARTICLE PHYSICS, Collisions, Physics ; elementary particles physics ; LEP ; standard model, Z0, Engineering (miscellaneous); Physics and Astronomy (miscellaneous), Physics Event Generation, DELPHI

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