Search for sleptons in ${\mathrm e}^+{\mathrm e}^- $ collisions at $\sqrt{s} = $ 183 to 189 GeV

Autor: Nektarios Benekos, Clara Troncon, Sigve Haug, Nathalie Besson, Krzysztof Doroba, Anna Lipniacka, Francisco Javier Cuevas Maestro, Klaus Moenig, Paolo Morettini, Mattias Ellert, MASSIMO CACCIA, Manfred Krammer, Oxana Smirnova, Philip Allport, William Murray, Borut Kersevan, Ivo Van Vulpen, Eduardo Cortina Gil, Daniel Jeans, Bernardo Tomé, Antonios Leisos, Stefano Ragazzi, Andre Sopczak, Isidro González Caballero, Costa Mezquita, Agnieszka Zalewska, Ulrich Schwickerath, Markus Elsing, Tim Adye, Alberto Ruiz Jimeno, Bjarne Stugu, Javier Fernandez Menendez, Jiri Chudoba, Andrei Sadovskiy, Katarzyna Grzelak, Inés Gil Botella, Jesus Marco de Lucas, Carmen Garcia, Luiz Mundim, Marcos Dracos, Marco Paganoni, Patrice Verdier, Francesco Terranova, Guillelmo Gomez-Ceballos, Tadeusz Lesiak, Arantza Oyanguren, Nicola Amapane, Ivano Lippi, Christian Weiser
Rok vydání: 2001
Předmět:
Zdroj: The European Physical Journal C. 19:29-42
ISSN: 1434-6052
1434-6044
Popis: Data taken by the DELPHI experiment at centre-of-mass energies of 183 GeV and 189 GeV with a total integrated luminosity of 212 pb^{-1} have been used to search for the supersymmetric partners of the electrons, muons, and taus in the context of the Minimal Supersymmetric Standard Model (MSSM). The decay topologies searched for were the direct decay ({\tilde \ell} -> \ell {\tilde \chi_1^0}), producing acoplanar lepton pairs plus missing energy, and the cascade decay ({\tilde \ell} -> \ell {\tilde \chi_2^0} -> \ell \gamma {\tilde \chi_1^0}), producing acoplanar lepton and photon pairs plus missing energy. The observed number of events is in agreement with Standard Model predictions. The 95% CL excluded mass limits for selectrons, smuons and staus are m_{\tilde {e}} \leq 87 GeV/c^2, m_{\tilde {\mu}} \leq 80 GeV/c^2 and m_{\tilde {\tau}} \leq 75 GeV/c^2, respectively, for values of \mu=-200 GeV/c^2 and tan(beta)=1.5.
Databáze: OpenAIRE
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