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| Título: | Search for charginos, neutralinos and gravitinos at LEP |
Autor: | Abreu, P.; Alemany-Fernández, R.; Camacho-Rozas, A. J. CSIC; Castillo, Mª Victoria CSIC ORCID; Colomer, M.; Cortina, E.; Ferrer, Antonio CSIC ORCID; Fuster, Juan CSIC ORCID; García García, Carmen CSIC ORCID; García, J.; Higón, Emilio CSIC ORCID; Marco, Jesús CSIC ORCID ; Marco, Rafael CSIC; Martínez-Vidal, Fernando CSIC ORCID; Matorras, Francisco CSIC ORCID ; Navas, Sergio CSIC; Zumerle, G. | Palabras clave: | Nuclear Physics, Heavy Ions, Hadrons | Fecha de publicación: | 1-mar-1998 | Editor: | Springer Nature | Citación: | European Physical Journal C - Particles and Fields 1 (1-2): 1-20 (1998) | Resumen: | An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c 2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/c 2, the lower limit at 95% confidence level on the chargino mass ranges from 84.3 GeV/c 2 to the kinematical limit (86.0 GeV/c 2), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass differences. The limit in the case of a light sneutrino is 67.6 GeV/c 2, provided that that there is no light sneutrino with a mass within 10 GeV/c 2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a picobarn are derived. The (μ,M 2) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c 2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino. imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c 2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino. | Descripción: | Abreu, P. et al. | Versión del editor: | http://dx.doi.org/10.1007/BF01245794 | URI: | http://hdl.handle.net/10261/96184 | DOI: | 10.1007/BF01245794 | ISSN: | 1434-6044 | E-ISSN: | 1434-6052 |
| Aparece en las colecciones: | (IFCA) Artículos (IFIC) Artículos |
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| charginos_lep_Abreu.pdf | 2,47 MB | Adobe PDF |  Visualizar/Abrir |
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