Measurement of the e+e- → ZZ production cross section at centre-of-mass energies of 183 and 189 GeV

R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, F. Martin, E. Merle, M. N. Minard, B. Pietrzyk, R. Alemany, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Graugès, A. JusteM. Martinez, G. Merino, R. Miquel, L. M. Mir, P. Morawitz, A. Pacheco, I. Riu, H. Ruiz, A. Colaleo, D. Creanza, M. de Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, V. Ciulli, G. Davies, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, T. C. Greening, A. W. Halley, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, P. Maley, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmitt, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, A. E. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, S. Dessagne, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil

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Resum

The e+e- → ZZ cross section at √s = 182.7 and 188.6 GeV has been measured using the ALEPH detector. A cut-based analysis yields cross section measurements of σzz(182.7GeV) = 0.11 ± 0.110.16 (stat.) ± 0.04 (syst.) pb and σZZ(188.6 GeV) = 0.69 ± 0.120.13 (stat.) ± 0.03 (syst.) pb . A neural network-based analysis yields σZZ(188.6GeV) = 0.64 ± 0.110.12 (stat.) ± 0.04 (syst.) pb . These measurements are consistent with the Standard Model expectations. © 1999 Published by Elsevier Science B.V. All rights reserved.
Idioma originalAnglès
Pàgines (de-a)287-302
RevistaPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volum469
Número1-4
DOIs
Estat de la publicacióPublicada - 1 de gen. 1999

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