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Search for heavy stable and long-lived particles in e(+)e(-) collisions at root s=189 GeV

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Search for heavy stable and long-lived particles in e(+)e(-) collisions at root s=189 GeV

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Cortina Gil, Eduardo; Costa Mezquita, María José; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gil Botella, Inés; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Martínez Vidal, Fernando; Navas Concha, Sergio; Oyanguren Campos, Arantza; Salt Cairols, José; Tortosa Martínez, Pablo

Aquest document és un/a article, creat/da en: 2000

Este documento está disponible también en : 10.1016/S0370-2693(00)00265-3

A search for stable and long-lived heavy charged particles was performed using the data taken by the DELPHI experiment at an energy of 189 GeV. The Cherenkov light detected in the Ring Imaging Cherenkov Detector and the ionisation loss measured in the Time Projection Chamber were used to identify heavy particles passing through the detector. No evidence for the production of such particles has been found, therefore exclusion limits at 95% confidence level were derived on the masses of left and right handed smuons and staus. The results were combined with previous DELPHI searches in this channel. Including previous DELPHI results, masses of left (right) handed stable smuons and staus can be excluded between 2 GeV/c^2 and 88 (87.5) GeV/c^2 at 95% CL.

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