A first measurement of the cross section of the process e(+)e(-) --> Z gamma gamma is reported using a total integrated luminosity of 231 pb(-1) collected with the L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV. By selecting hadronic events with two isolated photons the e(+)e(-) --> Z gamma gamma cross section is measured to be 0.49(-0.17)(+0.20) +/- 0.04 pb at 182.7 GeV and 0.47 +/- 0.10 +/- 0.04 pb at 188.7 GeV. The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings a(0)/Lambda(2) and a(c)/Lambda(2) of -0.009 GeV-2 < a(0)/Lambda(2) < 0.008 GeV-2 and -0.007 GeV-2 < a(c)/Lambda(2) < 0.013 GeV-2 are derived at 95% confidence level. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

Measurement of the e(+)e(-) -> Z gamma gamma cross section and determination of quartic gauge boson couplings at LEP / M., A., P., A., O., A., M., A.B., J., A., G., A., J., A., A., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., A., A., T., A., T., A., Bagnaia, P., L., B., A., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 478:(2000), pp. 39-49. [10.1016/S0370-2693(00)00279-3]

Measurement of the e(+)e(-) -> Z gamma gamma cross section and determination of quartic gauge boson couplings at LEP

BAGNAIA, Paolo;FACCINI, Riccardo;GENTILE, Simonetta;GIAGU, Stefano;ORGANTINI, Giovanni;PARAMATTI, Riccardo;
2000

Abstract

A first measurement of the cross section of the process e(+)e(-) --> Z gamma gamma is reported using a total integrated luminosity of 231 pb(-1) collected with the L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV. By selecting hadronic events with two isolated photons the e(+)e(-) --> Z gamma gamma cross section is measured to be 0.49(-0.17)(+0.20) +/- 0.04 pb at 182.7 GeV and 0.47 +/- 0.10 +/- 0.04 pb at 188.7 GeV. The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings a(0)/Lambda(2) and a(c)/Lambda(2) of -0.009 GeV-2 < a(0)/Lambda(2) < 0.008 GeV-2 and -0.007 GeV-2 < a(c)/Lambda(2) < 0.013 GeV-2 are derived at 95% confidence level. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
2000
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the e(+)e(-) -&gt; Z gamma gamma cross section and determination of quartic gauge boson couplings at LEP / M., A., P., A., O., A., M., A.B., J., A., G., A., J., A., A., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., A., A., T., A., T., A., Bagnaia, P., L., B., A., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 478:(2000), pp. 39-49. [10.1016/S0370-2693(00)00279-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/472514
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