Measurements of on-shell ZZ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies √s = 182.6 GeV and 188.6 GeV, respectively. Results obtained in each of the final states qq̄qq̄, μ+μ-qq̄, e+e-qq̄, vv̄qq̄ l+l-l+l-, and vv̄l+l- are presented. The measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs (NC02) are: σNC02 (182.6 GeV) = 0.38 ± 0.18 (stat) ± 0.04 (syst) pb, σNC02 (188.6 GeV) = 0.60±0.13 (stat) ±0.07 (syst) pb. They are consistent with the Standard Model expectations of 0.25 and 0.65 pb at each energy. © 2001 Elsevier Science B.V.

Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Albrecht, Z., et al. (2001). Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV. PHYSICS LETTERS. SECTION B, 497(3-4), 199-213 [10.1016/S0370-2693(00)01346-0].

Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV

CALVI, MARTA;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;TERRANOVA, FRANCESCO;
2001

Abstract

Measurements of on-shell ZZ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies √s = 182.6 GeV and 188.6 GeV, respectively. Results obtained in each of the final states qq̄qq̄, μ+μ-qq̄, e+e-qq̄, vv̄qq̄ l+l-l+l-, and vv̄l+l- are presented. The measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs (NC02) are: σNC02 (182.6 GeV) = 0.38 ± 0.18 (stat) ± 0.04 (syst) pb, σNC02 (188.6 GeV) = 0.60±0.13 (stat) ±0.07 (syst) pb. They are consistent with the Standard Model expectations of 0.25 and 0.65 pb at each energy. © 2001 Elsevier Science B.V.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
199
213
15
Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Albrecht, Z., et al. (2001). Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV. PHYSICS LETTERS. SECTION B, 497(3-4), 199-213 [10.1016/S0370-2693(00)01346-0].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/156480
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