par Abdallah, Jalal Mohamad J.;Bertrand, Daniel 
;D'Hondt, Jorgen;De Clercq, Catherine;Lemonne, Jacques ;Wickens, John H. ; [et al.]
Référence European Physical Journal C. Particles and Fields, 50, 3, page (507-518)
Publication Publié, 2007-04
;D'Hondt, Jorgen;De Clercq, Catherine;Lemonne, Jacques ;Wickens, John H. ; [et al.]Référence European Physical Journal C. Particles and Fields, 50, 3, page (507-518)
Publication Publié, 2007-04
Article révisé par les pairs
| Résumé : | 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 RCKM = |
