The pair production of Z bosons is studied using the data collected by the L3 detector at LEP in 1998 in e(+)e(-) collisions at a centre-of-mass energy of 189 GeV. All the visible final states are considered and the cross section of this process is measured to be 0.74(-0.14)(+0.15)(stat.) +/- 0.04(syst)pb. Final states containing b quarks are enhanced by a dedicated selection and their production cross section is found to be 0.18(-0.07)(+0.09)(stat) +/- 0.02(syst) pb. Both results are in agreement with the Standard Model predictions. Limits on anomalous couplings between neutral gauge bosons are derived from these measurements. (C) 1999 Published by Elsevier Science B.V. All rights reserved. RI Fiandrini, Emanuele/C-4549-2008; Achard, Pablo/C-2983-2009; Lista, Luca/C-5719-2008; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012
Study of Z boson pair production in e(+)e(-) collisions at LEP at root s=189 GeV
CONVENTI, Francesco Alessandro;DELLA PIETRA, Massimo;
1999-01-01
Abstract
The pair production of Z bosons is studied using the data collected by the L3 detector at LEP in 1998 in e(+)e(-) collisions at a centre-of-mass energy of 189 GeV. All the visible final states are considered and the cross section of this process is measured to be 0.74(-0.14)(+0.15)(stat.) +/- 0.04(syst)pb. Final states containing b quarks are enhanced by a dedicated selection and their production cross section is found to be 0.18(-0.07)(+0.09)(stat) +/- 0.02(syst) pb. Both results are in agreement with the Standard Model predictions. Limits on anomalous couplings between neutral gauge bosons are derived from these measurements. (C) 1999 Published by Elsevier Science B.V. All rights reserved. RI Fiandrini, Emanuele/C-4549-2008; Achard, Pablo/C-2983-2009; Lista, Luca/C-5719-2008; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
